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thatisuday/bash-special-characters.csv

Last active July 9, 2022 23:11
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Special Characters in Bash
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bash-special-characters.csv
Special Character Description Extra information
$_ Absolute path of the shell binary file that is executing the script Ex. /bin/bash or /bin.sh
$0 Path of the executing Bash script Ex. ./my-file.sh
$N Nth argument passed to the executing Bash script $1 is 'apple' for the command 'bash file.sh apple'
$* All arguments passed to the executing Bash script expands to a word inside double-quotes
$@ All arguments passed to the executing Bash script expands to a separate words inside double-quotes
$# Number of arguments passed to the executing Bash script $# is 3 for the command 'bash file.sh A B C'
$? Exit status code of last executed command in the foreground returns a decimal number between 0-255
$! Process ID of last executed command in the background empty of no background command was extecuted
$$ Process ID of executing Bash script returns a decimal number
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