Quick Cheatsheets when debugging bash command line construction

posix-commandline-processing.sh

# https://bashrules.blogspot.com/2006/04/bash-order-of-expansions.html
# http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_03_04.html
alias bashexpandorder='echo '\''
    1. {} brace
    2. ~ tilde 
    3. $VAR parameter & variable 
    4. $() command-substitution
    5. $(()) arithmetic expansion
    6. (IFS) word-splitting
    7. * ? [ filename expansion (-f will disable)
    X. quote-removal
    ...
    ?. proces substitusion
    ?. word-splitting
'\'''
alias bashparsinglevels=bashexpandorder

# https://unix.stackexchange.com/a/60889
# http://mywiki.wooledge.org/BashParser
alias bashactionorder="echo '
    1. READ DATA to execute
    2. Process QUOTES
    '\'' : 
    \" : \ $ \`\`
    3. SPLIT the read data into COMMANDS
    4. Parse SPECIAL OPERATORS
    5. Perform EXPANSIONS
    6. Split the command into a COMMAND NAME AND ARGUMENTS
    7. EXECUTE the command

'"

# More comprehensive resource: (the actual 
# http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html