linux

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

What is the meaning of $? in a shell script?

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

Difference between ${} and $() in a shell script

$(command) is “command substitution”. As you seem to understand, it runs the command, captures its output, and inserts that into the command line that contains the $(); e.g., $ ls -ld $(date +%B).txt

What is the difference between $@ and $* in shell scripts?

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?

regex

Meaning of "=~" operator in shell script [duplicate] Asked 13 years, 4 months ago Modified 12 years, 6 months ago Viewed 96k times

Meaning of $? (dollar question mark) in shell scripts

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

What are the special dollar sign shell variables?

$! 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

What is the $? (dollar question mark) variable in shell scripting?

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.

What does $# mean in shell?

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.