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OSXFAQ Mac OS X UNIX Tip-of-the-Day
Week 105 - Controlling Bash At Startup (18 April 2005)
by
Adrian Mayo - Editor, OSXFAQ
Friday - Script vs 'source' vs '.'
Executing a script in the usual manner from the command line:
$ name-of-script
executes the script in a new bash shell. If you want a script executed by the current shell you must 'source' it:
$ source name-of-script
or
$ . name-of-script
Executing an initialisation script like /etc/bashrc instead of sourcing it will not work. When the new shell ends all its environment and shell variables are destroyed.
If you need to keep track on which initialisation scripts have been run in any one shell environment, use the following technique.
To /etc/profile add:
declare -x STARTUP="/etc/profile, "
To /etc/bashrc add:
declare -x STARTUP="${STARTUP}/etc/bashrc, "
and similarly to ~/.bash_profile add:
STARTUP="${STARTUP}~/.bash_profile, "
and to ~/.bashrc add:
STARTUP="${STARTUP}~/.bashrc, "
Any other sourced files such as those from Fink should also have similar statements added.
If you want to learn more about Mac OS X Unix visit the Learning Center
click.
- For beginners: Mac OS X Unix Tutorials
- For detailed information on specific topics: Advanced Unix
- For OS X in gereral: Mac OS X Tutorials
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