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Bookmark or Share- bash - Shell equality operators (=, ==, -eq) - Stack OverflowWhat is the difference between =, == and -eq in shell scripting? Is there any difference between the following?
- linux - What does $@ mean in a shell script? - Stack OverflowThe shell splits tokens based on the contents of the IFS environment variable. Its default value is \t\n; i.e., whitespace, tab, and newline. Expanding "$@" gives you a pristine copy of the arguments passed. Expanding $@ may not.
- regex - Meaning of "=~" operator in shell script - Stack OverflowThe return value is 0 if the string matches the pattern, and 1 otherwise. If the regular expression is syntactically incorrect, the conditional expression's return value is 2. If the shell option nocasematch is enabled, the match is performed without regard to the case of alphabetic characters.
- Meaning of $? (dollar question mark) in shell scriptsThe shell treats several parameters specially. These parameters may only be referenced; assignment to them is not allowed. [...]? Expands to the exit status of the most recently executed foreground pipeline. ANSI C and POSIX then recommend that: 0 means the program was successful. other values: the program failed somehow.
- What is the $? (dollar question mark) variable in shell scripting?Try the following in the shell: ls somefile echo $? If somefile exists (regardless whether it is a file or directory), you will get the return value thrown by the ls command, which should be 0 (default "success" return value). If it doesn't exist, you should get a number other then 0. The exact number depends on the program.
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