Enumerated shellcheck codes https://github.com/koalaman/shellcheck/wiki/Checks (Update: 05-21-2021)

_shellcheck.csv

_shellcheck.md

• SC1000 $ is not used specially and should therefore be escaped.
• SC1001 This \o will be a regular 'o' in this context.
• SC1003 Want to escape a single quote? echo 'This is how it'\''s done'.
• SC1004 This backslash+linefeed is literal. Break outside single quotes if you just want to break the line.
• SC1007 Remove space after = if trying to assign a value (or for empty string, use var='' ... ).
• SC1008 This shebang was unrecognized. ShellCheck only supports sh/bash/dash/ksh. Add a 'shell' directive to specify.
• SC1009 The mentioned parser error was in ...
• SC1010 Use semicolon or linefeed before 'done' (or quote to make it literal).
• SC1011 This apostrophe terminated the single quoted string!
• SC1012 \t is just literal t here. For tab, use "$(printf '\t')" instead.
• SC1014 Use 'if cmd; then ..' to check exit code, or 'if [ "$(cmd)" = .. ]' to check output.
• SC1015 This is a unicode double quote. Delete and retype it.
• SC1016 This is a Unicode single quote. Delete and retype it.
• SC1017 Literal carriage return. Run script through tr -d '\r' .
• SC1018 This is a unicode non-breaking space. Delete it and retype as space.
• SC1019 Expected this to be an argument to the unary condition.
• SC1020 You need a space before the if single then "]" else "]]"
• SC1026 If grouping expressions inside [[..]], use ( .. ).
• SC1028 In [..] you have to escape \( \) or preferably combine [..] expressions.
• SC1029 In [[..]] you shouldn't escape ( or ).
• SC1033 Test expression was opened with double [[ but closed with single ]. Make sure they match.
• SC1034 Test expression was opened with double [ but closed with single ]]. Make sure they match.
• SC1035 You need a space here
• SC1036 ( is invalid here. Did you forget to escape it?
• SC1037 Braces are required for positionals over 9, e.g. ${10}.
• SC1038 Shells are space sensitive. Use '< <(cmd)', not '<<(cmd)'.
• SC1039 Remove indentation before end token (or use <<- and indent with tabs).
• SC1040 When using <<-, you can only indent with tabs.
• SC1041 Found 'eof' further down, but not on a separate line.
• SC1042 Close matches include '-eof' (!= 'eof').
• SC1044 Couldn't find end token `EOF' in the here document.
• SC1045 It's not 'foo &; bar', just 'foo & bar'.
• SC1046 Couldn't find 'fi' for this 'if'.
• SC1047 "Expected 'fi' matching previously mentioned 'if'.
• SC1048 Can't have empty then clauses (use 'true' as a no-op).
• SC1049 Did you forget the 'then' for this 'if'?
• SC1050 Expected 'then'.
• SC1051 Semicolons directly after 'then' are not allowed. Just remove it.
• SC1052 Semicolons directly after 'then' are not allowed. Just remove it.
• SC1053 Semicolons directly after 'else' are not allowed. Just remove it.
• SC1054 You need a space after the '{'.
• SC1056 Expected a '}'. If you have one, try a ; or \n in front of it.
• SC1058 Expected do.
• SC1061 Couldn't find 'done' for this 'do'.
• SC1062 Expected 'done' matching previously mentioned 'do'.
• SC1064 Expected a { to open the function definition.
• SC1065 Trying to declare parameters? Don't. Use () and refer to params as $1, $2..
• SC1066 Don't use $ on the left side of assignments.
• SC1067 For indirection, use arrays, declare "var$n=value", or (for sh) read/eval
• SC1068 Don't put spaces around the = in assignments.
• SC1069 You need a space before the [.
• SC1070 Parsing stopped here. Mismatched keywords or invalid parentheses?
• SC1071 ShellCheck only supports sh/bash/dash/ksh scripts. Sorry!
• SC1072 Unexpected ..
• SC1073 Couldn't parse this (thing). Fix to allow more checks.
• SC1074 Did you forget the ;; after the previous case item?
• SC1075 Use 'elif' instead of 'else if'.
• SC1077 For command expansion, the tick should slant left (` vs ´).
• SC1078 Did you forget to close this double quoted string?
• SC1079 This is actually an end quote, but due to next char it looks suspect.
• SC1081 Scripts are case sensitive. Use 'if', not 'If'.
• SC1082 This file has a UTF-8 BOM. Remove it with: LC_CTYPE=C sed '1s/^...//' < yourscript .
• SC1083 This {/} is literal. Check expression (missing ;/\n?) or quote it.
• SC1084 Use #!, not !#, for the shebang.
• SC1086 Don't use $ on the iterator name in for loops.
• SC1087 "Use braces when expanding arrays, e.g. ${array[idx]} (or ${var}[.. to quiet)."
• SC1088 Parsing stopped here. Invalid use of parentheses?
• SC1089 Parsing stopped here. Is this keyword correctly matched up?
• SC1090 Can't follow non-constant source. Use a directive to specify location.
• SC1091 Not following: (error message here)
• SC1094 Parsing of sourced file failed. Ignoring it.
• SC1095 You need a space or linefeed between the function name and body.
• SC1097 Unexpected ==. For assignment, use =. For comparison, use [/[[.
• SC1098 Quote/escape special characters when using eval, e.g. eval "a=(b)".
• SC1099 You need a space before the #.
• SC1100 This is a unicode dash. Delete and retype as ASCII minus.
• SC1101 Delete trailing spaces after \ to break line (or use quotes for literal space).
• SC1102 Shells disambiguate $(( differently or not at all. For $(command substition), add space after $( . For $((arithmetics)), fix parsing errors.
• SC1104 Use #!, not just !, for the shebang.
• SC1105 Shells disambiguate (( differently or not at all. If the first ( should start a subshell, add a space after it.
• SC1106 In arithmetic contexts, use < instead of -lt
• SC1107 This directive is unknown. It will be ignored.
• SC1108 You need a space before and after the = .
• SC1109 This is an unquoted HTML entity. Replace with corresponding character.
• SC1110 This is a unicode quote. Delete and retype it (or quote to make literal).
• SC1111 This is a unicode quote. Delete and retype it (or ignore/singlequote for literal).
• SC1112 This is a unicode quote. Delete and retype it (or ignore/doublequote for literal).
• SC1113 Use #!, not just #, for the shebang.
• SC1114 Remove leading spaces before the shebang.
• SC1115 Remove spaces between # and ! in the shebang.
• SC1116 Missing $ on a $((..)) expression? (or use ( ( for arrays).
• SC1117 Backslash is literal in "\n". Prefer explicit escaping: "\\n".
• SC1118 Delete whitespace after the here-doc end token.
• SC1119 Add a linefeed between end token and terminating ')'.
• SC1120 No comments allowed after here-doc token. Comment the next line instead.
• SC1121 Add ;/& terminators (and other syntax) on the line with the <<, not here.
• SC1122 Nothing allowed after end token. To continue a command, put it on the line with the <<.
• SC1123 ShellCheck directives are only valid in front of complete compound commands, like if, not e.g. individual elif branches.
• SC1124 ShellCheck directives are only valid in front of complete commands like 'case' statements, not individual case branches.
• SC1125 Invalid key=value pair in directive
• SC1126 Place shellcheck directives before commands, not after.
• SC1127 Was this intended as a comment? Use # in sh.
• SC1128 The shebang must be on the first line. Delete blanks and move comments.
• SC1129 You need a space before the !.
• SC1130 You need a space before the :.
• SC1131 Use elif to start another branch.
• SC1132 This & terminates the command. Escape it or add space after & to silence.
• SC1133 Unexpected start of line. If breaking lines, |/||/&& should be at the end of the previous one.
• SC1135 Prefer escape over ending quote to make $ literal. Instead of "It costs $"5, use "It costs \$5"
• SC1136 Unexpected characters after terminating ]. Missing semicolon/linefeed?
• SC1139 Use || instead of '-o' between test commands.
• SC1140 Unexpected parameters after condition. Missing &&/||, or bad expression?
• SC1141 Unexpected tokens after compound command. Bad redirection or missing ;/&&/||/|?
• SC1142 Use 'done < <(cmd)' to redirect from process substitution (currently missing one '<').
• SC1143 This backslash is part of a comment and does not continue the line.
• SC2000 See if you can use ${#variable} instead
• SC2001 SC2001: See if you can use ${variable//search/replace} instead.
• SC2002 Useless cat. Consider 'cmd < file | ..' or 'cmd file | ..' instead.
• SC2003 expr is antiquated. Consider rewriting this using $((..)), ${} or [[ ]].
• SC2004 $/${} is unnecessary on arithmetic variables.
• SC2005 Problematic code:
• SC2006 Use $(...) notation instead of legacy backticked `...`.
• SC2007 Use $((..)) instead of deprecated $[..]
• SC2008 echo doesn't read from stdin, are you sure you should be piping to it?
• SC2009 SC2009 Consider using pgrep instead of grepping ps output.
• SC2010 Don't use ls | grep. Use a glob or a for loop with a condition to allow non-alphanumeric filenames.
• SC2011 Use find -print0 or find -exec to better handle non-alphanumeric filenames.
• SC2012 Use find instead of ls to better handle non-alphanumeric filenames.
• SC2013 To read lines rather than words, pipe/redirect to a 'while read' loop.
• SC2014 This will expand once before find runs, not per file found.
• SC2015 Note that A && B || C is not if-then-else. C may run when A is true.
• SC2016 Expressions don't expand in single quotes, use double quotes for that.
• SC2017 Increase precision by replacing a/b*c with a*c/b.
• SC2018 Use '[:lower:]' to support accents and foreign alphabets.
• SC2019 Use '[:upper:]' to support accents and foreign alphabets.
• SC2020 tr replaces sets of chars, not words (mentioned due to duplicates).
• SC2021 Don't use [] around ranges in tr, it replaces literal square brackets.
• SC2022 Note that unlike globs, o* here matches 'ooo' but not 'oscar'
• SC2024 sudo doesn't affect redirects. Use ..| sudo tee file
• SC2025 Make sure all escape sequences are enclosed in \[..\] to prevent line wrapping issues
• SC2026 This word is outside of quotes. Did you intend to 'nest '"'single quotes'"' instead'?
• SC2027 The surrounding quotes actually unquote this. Remove or escape them.
• SC2028 echo won't expand escape sequences. Consider printf.
• SC2029 Note that, unescaped, this expands on the client side.
• SC2030 Modification of var is local (to subshell caused by pipeline).
• SC2031 var was modified in a subshell. That change might be lost.
• SC2032 Use own script or sh -c '..' to run this from su.
• SC2033 Shell functions can't be passed to external commands.
• SC2034 foo appears unused. Verify it or export it.
• SC2035 Use ./*glob* or -- *glob* so names with dashes won't become options.
• SC2036 If you wanted to assign the output of the pipeline, use a=$(b | c) .
• SC2037 To assign the output of a command, use var=$(cmd) .
• SC2038 Use -print0/-0 or find -exec + to allow for non-alphanumeric filenames.
• SC2039 In POSIX sh, something is undefined.
• SC2040 #!/bin/sh was specified, so ____ is not supported, even when sh is actually bash.
• SC2041 This is a literal string. To run as a command, use $(..) instead of '..' .
• SC2043 This loop will only ever run once for a constant value. Did you perhaps mean to loop over dir/*, $var or $(cmd)?"
• SC2044 For loops over find output are fragile. Use find -exec or a while read loop.
• SC2045 Iterating over ls output is fragile. Use globs.
• SC2046 Quote this to prevent word splitting
• SC2048 Use "$@" (with quotes) to prevent whitespace problems.
• SC2049 =~ is for regex, but this looks like a glob. Use = instead.
• SC2050 This expression is constant. Did you forget the $ on a variable?
• SC2051 Bash doesn't support variables in brace range expansions.
• SC2053 Quote the rhs of = in [[ ]] to prevent glob matching.
• SC2054 Use spaces, not commas, to separate array elements.
• SC2055 You probably wanted && here, otherwise it's always true.
• SC2056 You probably wanted && here
• SC2057 Unknown binary operator.
• SC2058 Unknown unary operator.
• SC2059 Don't use variables in the printf format string. Use printf "..%s.." "$foo".
• SC2060 Quote parameters to tr to prevent glob expansion.
• SC2061 Quote the parameter to -name so the shell won't interpret it.
• SC2062 Quote the grep pattern so the shell won't interpret it.
• SC2063 Grep uses regex, but this looks like a glob.
• SC2064 Use single quotes, otherwise this expands now rather than when signalled.
• SC2065 This is interpreted as a shell file redirection, not a comparison.
• SC2066 Since you double quoted this, it will not word split, and the loop will only run once.
• SC2067 Missing ';' or + terminating -exec. You can't use |/||/&&, and ';' has to be a separate, quoted argument.
• SC2068 Double quote array expansions to avoid re-splitting elements.
• SC2069 To redirect stdout+stderr, 2>&1 must be last (or use '{ cmd > file; } 2>&1' to clarify).
• SC2070 -n doesn't work with unquoted arguments. Quote or use [[ ]].
• SC2071 > is for string comparisons. Use -gt instead.
• SC2072 Decimals are not supported. Either use integers only, or use bc or awk to compare.
• SC2073 Escape \< to prevent it redirecting (or switch to [[ .. ]]).
• SC2074 Can't use =~ in [ ]. Use [[..]] instead.
• SC2076 Don't quote rhs of =~, it'll match literally rather than as a regex.
• SC2077 You need spaces around the comparison operator.
• SC2078 This expression is constant. Did you forget a $ somewhere?
• SC2079 (( )) doesn't support decimals. Use bc or awk.
• SC2080 Numbers with leading 0 are considered octal.
• SC2081 [ .. ] can't match globs. Use [[ .. ]] or grep.
• SC2082 To expand via indirection, use name="foo$n"; echo "${!name}".
• SC2084 Remove '$' or use '_=$((expr))' to avoid executing output.
• SC2086 Double quote to prevent globbing and word splitting.
• SC2087 Quote 'EOF' to make here document expansions happen on the server side rather than on the client.
• SC2088 Tilde does not expand in quotes. Use $HOME.
• SC2089 Quotes/backslashes will be treated literally. Use an array.
• SC2090 Quotes/backslashes in this variable will not be respected.
• SC2091 Remove surrounding $() to avoid executing output (or use eval if intentional).
• SC2092 Remove backticks to avoid executing output.
• SC2093 Remove "exec " if script should continue after this command.
• SC2094 SC2094 Make sure not to read and write the same file in the same pipeline.
• SC2095 Use ssh -n to prevent ssh from swallowing stdin.
• SC2096 On most OS, shebangs can only specify a single parameter.
• SC2097 This assignment is only seen by the forked process.
• SC2098 This expansion will not see the mentioned assignment.
• SC2099 Use $((..)) for arithmetics, e.g. i=$((i + 2))
• SC2100 Use $((..)) for arithmetics, e.g. i=$((i + 2))
• SC2101 Named class needs outer [], e.g. [[:digit:]].
• SC2102 Ranges can only match single chars (mentioned due to duplicates).
• SC2103 Use a ( subshell ) to avoid having to cd back.
• SC2104 In functions, use return instead of break.
• SC2105 break is only valid in loops
• SC2106 SC2106: This only exits the subshell caused by the pipeline.
• SC2107 Instead of [ a && b ], use [ a ] && [ b ].
• SC2108 In [[..]], use && instead of -a.
• SC2109 Instead of [ a || b ], use [ a ] || [ b ].
• SC2110 In [[..]], use || instead of -o.
• SC2112 'function' keyword is non-standard. Delete it.
• SC2113 function keyword is non-standard. Use foo() instead of function foo.
• SC2114 Warning: deletes a system directory.
• SC2115 Use "${var:?}" to ensure this never expands to /* .
• SC2116 SC2116 Useless echo? Instead of 'cmd $(echo foo)', just use 'cmd foo'.
• SC2117 To run commands as another user, use su -c or sudo.
• SC2119 Use foo "$@" if function's $1 should mean script's $1.
• SC2120 foo references arguments, but none are ever passed.
• SC2121 To assign a variable, use just 'var=value', no 'set ..'.
• SC2122 >= is not a valid operator. Use '! a < b' instead.
• SC2123 PATH is the shell search path. Use another name.
• SC2124 Assigning an array to a string! Assign as array, or use * instead of @ to concatenate.
• SC2125 Brace expansions and globs are literal in assignments. Quote it or use an array.
• SC2126 Consider using grep -c instead of grep | wc
• SC2128 Expanding an array without an index only gives the first element.
• SC2129 Consider using { cmd1; cmd2; } >> file instead of individual redirects.
• SC2130 -eq is for integer comparisons. Use = instead.
• SC2139 This expands when defined, not when used. Consider escaping.
• SC2140 Word is on the form "A"B"C" (B indicated). Did you mean "ABC" or "A\"B\"C"?
• SC2141 Did you mean IFS=$'\t' ?
• SC2142 Aliases can't use positional parameters. Use a function.
• SC2143 Use grep -q instead of comparing output with [ -n .. ].
• SC2144 -e doesn't work with globs. Use a for loop.
• SC2145 Argument mixes string and array. Use * or separate argument.
• SC2146 This action ignores everything before the -o. Use \( \) to group.
• SC2147 Literal tilde in PATH works poorly across programs.
• SC2148 shellcheck shell=bash
• SC2149 Remove $/${} for numeric index, or escape it for string.
• SC2150 -exec does not automatically invoke a shell. Use -exec sh -c .. for that.
• SC2151 Only one integer 0-255 can be returned. Use stdout for other data.
• SC2152 Can only return 0-255. Other data should be written to stdout.
• SC2153 Possible Misspelling: MYVARIABLE may not be assigned, but MY_VARIABLE is.
• SC2154 var is referenced but not assigned.
• SC2155 Declare and assign separately to avoid masking return values.
• SC2156 Injecting filenames is fragile and insecure. Use parameters.
• SC2157 Argument to implicit -n is always true due to literal strings.
• SC2158 [ false ] is true. Remove the brackets
• SC2159 [ 0 ] is true. Use 'false' instead
• SC2160 Instead of '[ true ]', just use 'true'.
• SC2161 Instead of '[ 1 ]', use 'true'.
• SC2162 read without -r will mangle backslashes
• SC2163 This does not export 'FOO'. Remove $/${} for that, or use ${var?} to quiet.
• SC2164 Use cd ... || exit in case cd fails.
• SC2165 This nested loop overrides the index variable of its parent.
• SC2166 Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.
• SC2167 This parent loop has its index variable overridden.
• SC2168 'local' is only valid in functions.
• SC2169 In dash, something is not supported.
• SC2170 Numerical -eq does not dereference in [..]. Expand or use string operator.
• SC2171 Found trailing ] outside test. Add missing [ or quote if intentional.
• SC2172 Trapping signals by number is not well defined. Prefer signal names.
• SC2173 SIGKILL/SIGSTOP can not be trapped.
• SC2174 When used with -p, -m only applies to the deepest directory.
• SC2175 Quote this invalid brace expansion since it should be passed literally to eval
• SC2176 'time' is undefined for pipelines. time single stage or bash -c instead.
• SC2177 'time' is undefined for compound commands, use time sh -c instead.
• SC2178 Variable was used as an array but is now assigned a string.
• SC2179 Use array+=("item") to append items to an array.
• SC2180 Bash does not support multidimensional arrays. Use 1D or associative arrays.
• SC2181 Check exit code directly with e.g. 'if mycmd;', not indirectly with $?.
• SC2182 This printf format string has no variables. Other arguments are ignored.
• SC2183 This format string has 2 variables, but is passed 1 arguments.
• SC2184 Quote arguments to unset so they're not glob expanded.
• SC2185 Some finds don't have a default path. Specify '.' explicitly.
• SC2186 tempfile is deprecated. Use mktemp instead.
• SC2187 Ash scripts will be checked as Dash. Add '# shellcheck shell=dash' to silence.
• SC2188 This redirection doesn't have a command. Move to its command (or use 'true' as no-op).
• SC2189 You can't have | between this redirection and the command it should apply to.
• SC2190 Elements in associative arrays need index, e.g. array=( [index]=value ) .
• SC2191 The = here is literal. To assign by index, use ( [index]=value ) with no spaces. To keep as literal, quote it.
• SC2192 This array element has no value. Remove spaces after = or use "" for empty string.
• SC2193 The arguments to this comparison can never be equal. Make sure your syntax is correct.
• SC2194 This word is constant. Did you forget the $ on a variable?
• SC2195 This pattern will never match the case statement's word. Double check them.
• SC2196 egrep is non-standard and deprecated. Use grep -E instead.
• SC2197 fgrep is non-standard and deprecated. Use grep -F instead.
• SC2198 Arrays don't work as operands in [ ]. Use a loop (or concatenate with * instead of @).
• SC2199 Arrays implicitly concatenate in [[ ]]. Use a loop (or explicit * instead of @).
• SC2200 Brace expansions don't work as operands in [ ]. Use a loop.
• SC2201 Brace expansion doesn't happen in [[ ]]. Use a loop.
• SC2202 Globs don't work as operands in [ ]. Use a loop.
• SC2203 Globs are ignored in [[ ]] except right of =/!=. Use a loop.
• SC2204 (..) is a subshell. Did you mean [ .. ], a test expression?
• SC2205 (..) is a subshell. Did you mean [ .. ], a test expression?
• SC2206 Quote to prevent word splitting/globbing, or split robustly with mapfile or read -a.
• SC2207 Prefer mapfile or read -a to split command output (or quote to avoid splitting).
• SC2208 Use [[ ]] or quote arguments to -v to avoid glob expansion.
• SC2209 Use var=$(command) to assign output (or quote to assign string).
• SC2210 This is a file redirection. Was it supposed to be a comparison or fd operation?
• SC2211 This is a glob used as a command name. Was it supposed to be in ${..}, array, or is it missing quoting?
• SC2212 Use 'false' instead of empty [/[[ conditionals.
• SC2213 getopts specified -n, but it's not handled by this 'case'.
• SC2214 This case is not specified by getopts.
• SC2215 This flag is used as a command name. Bad line break or missing [ .. ]?
• SC2216 Piping to 'rm', a command that doesn't read stdin. Wrong command or missing xargs?
• SC2217 Redirecting to 'echo', a command that doesn't read stdin. Bad quoting or missing xargs?
• SC2218 This function is only defined later. Move the definition up.
• SC2219 Instead of let expr, prefer (( expr )) .
• SC2220 Invalid flags are not handled. Add a *) case.
• SC2221 This pattern always overrides a later one.
• SC2222 This pattern never matches because of a previous pattern.
• SC2223 This default assignment may cause DoS due to globbing. Quote it.
• SC2224 This mv has no destination. Check the arguments.
• SC2225 This cp has no destination. Check the arguments.
• SC2226 This ln has no destination. Check the arguments, or specify '.' explicitly.
• SC2227 Redirection applies to the find command itself. Rewrite to work per action (or move to end).
• SC2229 This does not read 'foo'. Remove $/${} for that, or use ${var?} to quiet.
• SC2230 which is non-standard. Use builtin 'command -v' instead.
• SC2231 Quote expansions in this for loop glob to prevent wordsplitting, e.g. "$dir"/*.txt .
• SC2232 Can't use sudo with builtins like cd. Did you want sudo sh -c .. instead?
• SC2233 Remove superfluous (..) around condition.
• SC2234 Remove superfluous (..) around test command.
• SC2235 Use { ..; } instead of (..) to avoid subshell overhead.
• SC2236 Use -n instead of ! -z.
• SC2237 Use [ -n .. ] instead of ! [ -z .. ].
• SC2238 Redirecting to/from command name instead of file. Did you want pipes/xargs (or quote to ignore)?
• SC2239 Ensure the shebang uses the absolute path to the interpreter.
• SC2240 The dot command does not support arguments in sh/dash. Set them as variables.
• SC2241 The exit status can only be one integer 0-255. Use stdout for other data.
• SC2242 Can only exit with status 0-255. Other data should be written to stdout/stderr.
• SC2243 Prefer explicit -n to check for output (or run command without [/[[ to check for success)
• SC2244 Prefer explicit -n to check non-empty string (or use =/-ne to check boolean/integer).
• SC2245 -d only applies to the first expansion of this glob. Use a loop to check any/all.
• SC2246 This shebang specifies a directory. Ensure the interpreter is a file.
• SC2247 Flip leading $ and " if this should be a quoted substitution.
• SC2248 Warn about variable references without braces.
• SC2249 Consider adding a default *) case, even if it just exits with error.
• SC2250 Prefer putting braces around variable references even when not strictly required.
• SC2251 This ! is not on a condition and skips errexit. Use && exit 1 instead, or make sure $? is checked.
• SC2252 You probably wanted && here, otherwise it's always true.
• SC2253 Use -R to recurse, or explicitly a-r to remove read permissions.
• SC2254 Quote expansions in case patterns to match literally rather than as a glob.
• SC2255 [ ] does not apply arithmetic evaluation. Evaluate with $((..)) for numbers, or use string comparator for strings.
• SC2256 This translated string is the name of a variable. Flip leading $ and " if this should be a quoted substitution.
• SC2257 Arithmetic modifications in command redirections may be discarded. Do them separately.
• SC2259 This redirection overrides piped input. To use both, merge or pass filenames.
• SC2260 This redirection overrides the output pipe. Use 'tee' to output to both.
• SC2261 Multiple redirections compete for stdout. Use cat, tee, or pass filenames instead.
• SC2262 This alias can't be defined and used in the same parsing unit. Use a function instead.
• SC2263 Since they're in the same parsing unit, this command will not refer to the previously mentioned alias.
• SC2264 This function unconditionally re-invokes itself. Missing command?
• SC2267 GNU xargs -i is deprecated in favor of -I{}
• SC2268 Avoid x-prefix in comparisons as it no longer serves a purpose.
• SC2269 This variable is assigned to itself, so the assignment does nothing.
• SC2270 To assign positional parameters, use 'set -- first second ..' (or use [ ] to compare).
• SC2271 For indirection, use arrays, declare "var$n=value", or (for sh) read/eval
• SC2272 Command name contains ==. For comparison, use [ "$var" = value ].
• SC2273 Sequence of ===s found. Merge conflict or intended as a commented border?
• SC2274 Command name starts with ===. Intended as a commented border?
• SC2275 Command name starts with =. Bad line break?
• SC2276 This is interpreted as a command name containing '='. Bad assignment or comparison?
• SC2277 Use BASH_ARGV0 to assign to $0 in bash (or use [ ] to compare).
• SC2278 $0 can't be assigned in Ksh (but it does reflect the current function).
• SC2279 $0 can't be assigned in Dash. This becomes a command name.
• SC2280 $0 can't be assigned this way, and there is no portable alternative.
• SC2281 Don't use $/${} on the left side of assignments.
• SC2282 Variable names can't start with numbers, so this is interpreted as a command.
• SC2283 Use [ ] to compare values, or remove spaces around = to assign (or quote '=' if literal).
• SC2284 Use [ x = y ] to compare values (or quote '==' if literal).
• SC2285 Remove spaces around += to assign (or quote '+=' if literal).
• SC3001 In POSIX sh, process substitution is undefined.
• SC3002 In POSIX sh, extglob is undefined.
• SC3003 In POSIX sh, $'..' is undefined.
• SC3006 In POSIX sh, standalone ((..)) is undefined.
• SC3012 In POSIX sh, lexicographical \< is undefined.
• SC3013 In POSIX sh, -nt is undefined.
• SC3014 In POSIX sh, == in place of = is undefined.
• SC3017 In POSIX sh, unary -a in place of -e is undefined.
• SC3018 In POSIX sh, ++ is undefined.
• SC3019 In POSIX sh, exponentials are undefined.
• SC3020 In POSIX sh, &> is undefined.
• SC3021 In POSIX sh, >& is undefined.
• SC3022 In POSIX sh, named file descriptors is undefined.
• SC3023 In POSIX sh, FDs outside of 0-9 are undefined.
• SC3024 In POSIX sh, += is undefined.
• SC3025 In POSIX sh, /dev/{tcp,udp} is undefined.
• SC3026 In POSIX sh, ^ in place of ! in glob bracket expressions is undefined.
• SC3028 In POSIX sh, VARIABLE is undefined.
• SC3031 In POSIX sh, redirecting from/to globs is undefined.
• SC3034 In POSIX sh, $(<file) is undefined.
• SC3035 In POSIX sh, `<file` is undefined.
• SC3037 In POSIX sh, echo flags are undefined.
• SC3038 In POSIX sh, exec flags are undefined.
• SC3039 In POSIX sh, 'let' is undefined.
• SC3043 In POSIX sh, local is undefined.
• SC3044 In POSIX sh, declare is undefined.
• SC3045 In POSIX sh, some-command-with-flag is undefined.
• SC3046 In POSIX sh, source in place of . is undefined.
• SC3047 In POSIX sh, trapping ERR is undefined.
• SC3048 In POSIX sh, prefixing signal names with 'SIG' is undefined.
• SC3049 In POSIX sh, using lower/mixed case for signal names is undefined.
• SC3050 In POSIX sh, printf %q is undefined.
• SC3053 In POSIX sh, indirect expansion is undefined.
• SC3054 In POSIX sh, array references are undefined.
• SC3055 In POSIX sh, array key expansion is undefined.
• SC3056 In POSIX sh, name matching prefixes are undefined.
• SC3057 In POSIX sh, string indexing is undefined.
• SC3060 In POSIX sh, string replacement is undefined.

generate.sh

#!/bin/bash

# clone wiki repo
git clone --depth 1 git@github.com:koalaman/shellcheck.wiki.git \
&& cd "$(basename "$_" .git)" \
|| exit 1

# make _shellcheck.md
grep -m1 '^##* .*$' SC*.md \
| sed -r 's_^(.*)...:##*  *_- [\1](https://github.com/koalaman/shellcheck/wiki/\1) _g' \
> _shellcheck.md

# make _shellcheck.csv
ruby -r csv << 'EOF'
CSV.open("_shellcheck.csv", ?w, force_quotes: true){|c|
    c<<%W{name link description}
    `cat _shellcheck.md`.split(?\n).map{
        c<<_1.sub(/^- \[/,"").split(/]\(|(?<=\d{4})\) /)
    }
}
EOF