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

$(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 …

Nov 15, 2010 · A bashism is a shell feature which is only supported in bash and certain other more advanced shells. It will not work under busybox sh or dash (which is /bin/sh on a lot of …

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 …

BTW, in bash a semi-colon is a statement separator, not a statement terminator, which is a new-line. So if you only have one statement on a line then the ; at end-of-line are superfluous. Not …

But as bash is a shell, where the main goal is to run other unix commands and react on result code and/or output ( commands are often piped filter, etc... ), storing command output in …

Jan 16, 2014 · Shell scripting: -z and -n options with if Ask Question Asked 11 years, 6 months ago Modified 6 months ago

May 8, 2017 · I'm writing a shell script and need to check that a terminal app has been installed. I want to use a TRY/CATCH command to do this unless there is a neater way.

Jun 26, 2011 · Check existence of input argument in a Bash shell script Asked 14 years, 1 month ago Modified 1 year, 1 month ago Viewed 2.1m times

Oct 17, 2016 · How to check if a file exists in a shell script Asked 8 years, 9 months ago Modified 1 year, 5 months ago Viewed 758k times