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Old 02-23-2006, 02:20 PM   #1
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use of source command

hi everyone,

i'm new to linux. what is the use of "source command"? i know it executes a script file.

my script file has the following commands:
echo "hello world";
echo "$pwd";
if ran the script using source command or simply on the shell, i get the same answer. then how is "source" command different shell and what is the use of "source command"?

Old 02-23-2006, 02:27 PM   #2
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The source command does it's stuff in the current shell instead of a sub-shell - the commands behave as if you typed them in your current shell. If you made the file executable and then ran it, the commands would execute in a sub-shell.

When you're only displaying stuff it doesn't matter which way you do it, but when you're controlling variables and processes it does.
Old 02-24-2006, 05:07 AM   #3
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thanks steve
Old 02-28-2006, 09:34 PM   #4
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You might want to use the pwd command like so: echo "$(pwd)" instead of $pwd incase you use variables with that name.
Old 02-28-2006, 09:42 PM   #5
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If you for example, make changes to /home/testuser/.bashrc and you want the changes to take effect immediately, simply run "source /home/testuser/.bashrc". That will update your current shell and you will see the effects of the changes.


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