Feb 20, 2011 · $0-The filename of the current script. $#-The number of arguments supplied to a script. $$-The process number of the current shell. For shell scripts, this is the process ID …

See What is the difference between > and >> (especially as it relates to use with the cat program)?, What does “3>&1 1>&2 2>&3” do in a script? and of course, your shell's manual. …

You can find a very nice reference for bash's [aka test builtin's operators here, or by running help test in a bash shell or info bash test or info bash '[' from any shell¹. If you are using a different …

Feb 25, 2014 · That way, all commands within the script will be run with root privileges and you only need to give the password once when launching the script. If you need a particular …

The shell performs various expansions (separately) ... The shell performs redirection and removes redirection operators and their operands from the parameter list. The shell executes a function, …

Usually the parent shell guesses that the script is written for the the same shell (minimal Bourne-like shells run the script with /bin/sh, bash runs it as a bash subprocess) ... Because of this, …

Jan 22, 2014 · @RobBell bash a type of shell program used to interpret the bash script. Its synopsis is bash [options] [command_string | file], so it is possible we execute one command …

The export statement works down hierachy (current shell and all it's subshells) not up as in your example. Alternatively (if you really want the script to effect the enviroment of your current …

Jul 5, 2018 · The relevant man page to check for this is that of the shell itself, bash, because -f is functionality that the shell provides, it's a bash built-in. On my system (CentOS 7), the fine …

May 1, 2011 · Now that we are in the same directory as the script, we have to specify to the shell that we want to execute the file by giving its location ./ (the current directory followed by a path …