Is there a way to have a script called source, that can be run without the full path?
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OK, if I understand you correctly, what you want is for the fake-souce to be be available to non-interactive shells (i.e. when running a script).
To do that you would need the alias to be set through the BASH_ENV variable.
From man bash:
When bash is started non-interactively, to run a shell script, for example, it looks for the variable
BASH_ENV in the environment, expands its value if it appears there, and uses the expanded value as the
name of a file to read and execute. Bash behaves as if the following command were executed:
if [ -n "$BASH_ENV" ]; then . "$BASH_ENV"; fi
but the value of the PATH variable is not used to search for the filename.
By default, aliases are not expanded in non-interactive shells. You can use the shopt builtin command to set the expand_aliases option, but that puts your shell at the mercy of whatever aliases happen to have been set. Unless you are running in a tightly controlled environment, there would be no command you could trust unless you have carefully purged the BASH_ALIASES associative array of anything not wanted.