This article needs additional citations for verification. (September 2018) (Learn how and when to remove this template message)
source is a Unix command that evaluates the file following the command, as a list of commands, executed in the current context. Frequently the "current context" is a terminal window into which the user is typing commands during an interactive session.
Some Bash scripts should be run using the
source your-script syntax rather than run as an executable command, e.g., if they contain a change directory (
cd) command and the user intends that they be left in that directory after the script is complete, or they contain an export command and the user wants to modify the environment of the current shell. Another usage situation is when a script file does not have the "execute" permission. Passing the script filename to the desired shell will run the script in a subshell, not the current context.
- "BASH BUILTIN COMMANDS", the (GNU) Linux man page for "source" in Bash-3.0. 2004 Apr 20