What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@
linux - What does $@ mean in a shell script? - Stack Overflow
$(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 -rwxr-xr-x 1 Noob Noob 867 Jul 2 11:09 July.txt ${parameter} is “parameter substitution”. A lot of information can be found in the shell’s man page, bash (1), under the “ Parameter ...
Difference between ${} and $() in a shell script - Super User
What is the purpose of "&&" in a shell command? - Stack Overflow
404 What is the difference between =, == and -eq in shell scripting? Is there any difference between the following?
I'm trying to learn shell scripting, and I need to understand someone else's code. What is the $? variable hold? I can't Google search the answer because they block punctuation characters.
When going through one shell script, I saw the term "$?". What is the significance of this term?
What is the meaning of $? in a shell script? - Unix & Linux Stack Exchange
$! 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 Manual. Here are all the environment variables set by the shell. For a comprehensive index, please see the Reference Manual Variable Index.
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.