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.

Jul 22, 2018 · 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 …

Difference between $ {} and $ () in a shell script Ask Question Asked 10 years, 10 months ago Modified 1 year, 2 months ago

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

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..

Shell script echo new line to file Ask Question Asked 14 years, 9 months ago Modified 12 years, 9 months ago

In any shell, you can convert the strings to numbers while respecting the order of dates simply by removing the dashes. ... Alternatively, you can go traditional and use the expr utility. ... As invoking …

Shell equality operators (=, ==, -eq) Asked 12 years, 4 months ago Modified 3 years, 11 months ago Viewed 659k times

Jul 10, 2014 · I know that the > sign is used for output redirection in the command line, but I'm having trouble finding something that explains the use of 2>&1 in the command line. For example: …

On the php manual for shell_exec, it shows that the function returns the output as a string. If you expect output from the program you launch, you need to capture this like so: