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

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 11 years, 7 months ago Modified 3 years, 1 month ago Viewed 634k times

Dec 14, 2024 · Shell - "Shell" is a program, which facilitates the interaction between the user and the operating system (kernel). There are many shell implementations available, like sh, Bash, …

$(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 …

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

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 …

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.

Dec 22, 2010 · 180 command-line - what is the purpose of &&? In shell, when you see $ command one && command two the intent is to execute the command that follows the && only …

Dec 14, 2012 · That is called a shebang, it tells the shell what program to interpret the script with, when executed. In your example, the script is to be interpreted and run by the bash shell. …