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.

$(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 …

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, …

Shell equality operators (=, ==, -eq) Asked 11 years, 6 months ago Modified 3 years, 1 month ago Viewed 632k times

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

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?

Jul 12, 2010 · What is the purpose of a command that does nothing, being little more than a comment leader, but is actually a shell builtin in and of itself? It's slower than inserting a …

What can you do with the eval command? Why is it useful? Is it some kind of a built-in function in bash? There is no man page for it..

Sep 30, 2010 · How to represent multiple conditions in a shell if statement? Asked 14 years, 9 months ago Modified 3 years, 5 months ago Viewed 1.2m times