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, 3 months ago Modified 3 years, 9 months ago Viewed 656k times Apr 3, 2012 · What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@
Sep 17, 2012 · Meaning of "=~" operator in shell script [duplicate] Ask Question Asked 13 years, 5 months ago Modified 12 years, 7 months ago 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. Aug 1, 2019 · What does echo $? mean in shell programming? true echo $? # echoes 0 false echo $? # echoes 1 From the manual: (acessible by calling man bash in your shell) ? Expands to the exit status .
Feb 20, 2011 · When going through one shell script, I saw the term "$?". What is the significance of this term? Difference between $ {} and $ () in a shell script Ask Question Asked 10 years, 8 months ago Modified 1 year, 1 month ago 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 this?
- (dollar question mark) variable in shell scripting?.
- Linux - What does $@ mean in a shell script?
- What does a dollar sign followed by an at-sign (@) mean in a shell script?
Regex - Meaning of "=~" operator in shell script - Stack Overflow. This indicates that "Shell quoting bug when merchant names contain apostrophes or punctuation" should be tracked with broader context and ongoing updates.
Meaning of "=~" operator in shell script [duplicate] Ask Question Asked 13 years, 5 months ago Modified 12 years, 7 months ago. For readers, this helps frame potential impact and what to watch next.
FAQ
What happened with Shell quoting bug when merchant names contain apostrophes or punctuation?
What does $# mean in shell?
Why is Shell quoting bug when merchant names contain apostrophes or punctuation important right now?
(dollar question mark) in shell scripts.
What should readers monitor next?
When going through one shell script, I saw the term "$?".
Sources
- https://stackoverflow.com/questions/6834487/what-is-the-dollar-question-mark-variable-in-shell-scripting
- https://stackoverflow.com/questions/20449543/shell-equality-operators-eq
- https://stackoverflow.com/questions/9994295/what-does-mean-in-a-shell-script
- https://stackoverflow.com/questions/12454731/meaning-of-operator-in-shell-script
