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
404 What is the difference between =, == and -eq in shell scripting? Is there any difference between the following? ... Is it simply that = and == are only used when the variables contain numbers?
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.
What does $# mean in shell? - Unix & Linux Stack Exchange
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