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What is the difference between . . and source? [duplicate] When the script is done, any changes that it made to the environment are discarded script The above sources the script It is as if the commands had been typed in directly Any environment changes are kept source script This also sources the script The source command is not required by POSIX and therefore is less portable than the shorter
Source vs . why different behaviour? - Unix Linux Stack Exchange source is a shell keyword that is supposed to be used like this: source file where file contains valid shell commands These shell commands will be executed in the current shell as if typed from the command line
What is the difference between . and source in shells? 2 source is there for readability and self-documentation, exists because it is quick to type The commands are identical Perl has long and short versions of many of its control variables for the same reason
bash - Revert . or source - Unix Linux Stack Exchange I accidentally sourced the wrong environment from a script Is there any way to 'unsource' it or in other words to revert it and restore the previous environment? The obvious answer is to start fr
How can I source environment changes system-wide? Similarly, source ing etc profile after a change will make those changes effective in your current session But suppose you need to change an environment variable that is defined in etc profile (or somewhere under etc profile d ) and want the change to be visible across all sessions of all users on the system immediately
scp copy direction: what is source, what is target? And most allow multiple sources before the final target if it makes sense to do so That includes scp Some commands (like the GNU versions of cp and mv) have an option (e g -t or --target-directory=DIRECTORY) that allow you to put the target first - but the default is the standard "source (s) before target"