I wonder why a command that *executes commands from a file in the current shell* is named source. I can't see a relation between **run commands in the current shell** and the meaning of the english word **source**. Is there a history behind that name?

I have a bash script, where I call exit somewhere to skip the rest of the script when getopts doesn't recognize an option or doesn't find an expected option argument. while getopts ":t:" opt; do case $opt in t) timelen="$OPTARG" ;; \?) printf "illegal option: -%s\n" "$OPTARG" >&2 echo "$usage" >&2 exit 1 ;; :) printf "missing argument for -%s\n" "$OPTARG" >&2 echo "$usage" >&2 exit 1 ;; esac done # reset of the script I source the script in a bash shell. When something is wrong, the shell exits. Is there some way other than exit to skip the rest of the script but without exiting the invoking shell? Replacing exit with return doesn't work like for a function call, and the rest of the script will runs. Thanks.

I have recently migrated from bash to zsh. I used to use the following token_refresh.sh script to ssh-add my private key to the session: #!/usr/bin/env bash echo "configuring ssh access.." eval "$(ssh-agent -s)" ssh-add ./my-key However, I can't run this directly from zsh in the dir /ssh: $ ls my-key my-key.pub token_refresh.sh $ . token_refresh.sh .: no such file or directory: token_refresh.sh I can run bash scripts using bash token_refresh.sh However, doesn't that start a bash session, ssh-add the key to the bash session, then exits. How can I portably run this script in bash and zsh?

I have script with #!/bin/ksh in the first line. When I try to execute this script (run ./myscript.sh) the error occurred: -bash: ./myscript.sh: /bin/ksh: bad interpreter: No such file or directory But when I execute this script through source myscript.sh or bash myscript.sh command - script runs successfully. Yes, ksh is not installed and it is correct to install this. But I can't understand different behavior ./ and bash or source

I need to source the file by decrypting it on the fly using the below command. . <(gpg -qd "$encrypted_filename") sh is not supporting process substitution. I can't use bash. Please suggest some other way. https://unix.stackexchange.com/questions/237939/is-there-a-way-to-source-an-encrypted-gpg-file-on-the-fly-in-a-script

A script on AIX which checks the number of parameters passed and complains if they are not correct:- if [ "$#" -ge 1 ]; then ... else echo 'Usage: myscript [b] [c]' fi The script sets some environment variables so it is sourced. By that I mean I type the following on my command line. There is no second script, I am not sourcing a script from within another script. . ./myscript.sh If I pass it no parameters, I expect it to print out the usage statement but instead it runs using the parameters passed to the previous command that was sourced (not necessarily even this script!). To double check this I added this line at the beginning of my script to prove that this was the case. echo $# $@ If I pass it no parameters, it prints out the number and the list of parameters from a previously sourced script. How do I get it to say $# is zero when I pass it zero parameters and source it? The smallest possible recreate is a script thus:- **myscript.sh** echo $# $@ and then run it thus:- . ./myscript.sh a b c which prints out 3 a b c then run it again without any parameters thus:- . ./myscript.sh which prints out the same 3 a b c when you would expect it to print out 0 If you don't source the script and just run it thus:- ./myscript.sh then it works as expected and prints out 0 I hope that clarifies the issue at hand. Since I seem to be getting lots of answers to explain why the above doesn't work and no answers to tell me what I should do instead, I thought I would have one more attempt at trying to explain what I am trying to do. **Requirement** I need to write a script that expects at least one parameter and complains if it is not invoked with a said parameter (see the first block of code in my question above), and this script needs to set some environment variables. Because of this second requirement I have assumed that I need to source the script so that the environment variables are still set when the script completes. How can you write a script that can tell when it has not been passed parameters that is also able to set an environment variable?