I'm trying to learn shell scripting, and I need to understand someone else's code. What is the $? variable hold? I can't Google search the answer because they block punctuation characters.

May 8, 2012 · I understand the basic difference between an interactive shell and a non-interactive shell. But what exactly differentiates a login shell from a non-login shell? Can you give …

Aug 1, 2019 · What does echo $? mean in shell programming?true echo $? # echoes 0 false echo $? # echoes 1 From the manual: (acessible by calling man bash in your shell) ? Expands to …

Feb 20, 2011 · When going through one shell script, I saw the term "$?". What is the significance of this term?

Sep 14, 2012 · $! is the PID of the most recent background command. $0 is the name of the shell or shell script. Most of the above can be found under Special Parameters in the Bash …

Oct 27, 2021 · 180 command-line - what is the purpose of &&? In shell, when you see $ command one && command two the intent is to execute the command that follows the && only if the first …

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What can you do with the eval command? Why is it useful? Is it some kind of a built-in function in bash? There is no man page for it..

I am building a shell as part of a school assignment, a limited version of bash. The whole program seems to function alright without any kind on leaks, but when I send invalid/nonexistent …

Sep 30, 2010 · How to represent multiple conditions in a shell if statement? Asked 15 years, 1 month ago Modified 3 years, 9 months ago Viewed 1.2m times