Difference between $ {} and $ () in a shell script Ask Question Asked 10 years, 9 months ago Modified 1 year, 2 months ago

Apr 3, 2012 · What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@

What does $# mean in shell? I have code such as if [ $# -eq 0 ] then I want to understand what $# means, but Google search is very bad for searching these kinds of things.

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.

Shell equality operators (=, ==, -eq) Asked 12 years, 4 months ago Modified 3 years, 10 months ago Viewed 658k times

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

Aug 1, 2019 · What does echo $? mean in shell programming? From the manual: (acessible by calling man bash in your shell) ? Expands to the exit status of the most recently executed foreground …

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 Reference …

Jul 22, 2018 · In shell scripts, what is the difference between $@ and $*? Which one is the preferred way to get the script arguments? Are there differences between the different shell interpreters about …

Dec 22, 2010 · In shell, when you see ... the intent is to execute the command that follows the only if the first command is successful. This is idiomatic of Posix shells, and not only found in Bash. It intends to …