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11.30.05
Symlinks
 By
A.P. Lawrence
Linux "symlinks" is a handy utility for managing symbolic links. It can clean
up the sort of problems that come from carelesness when creating symbolic links.
For purposes of illustration, I created some legal but structurally incorrect
symbolic links. With the exeption of the "dangling" sl3 (a dangling symlink points
somewhere that does not exist), these all work, but they have problems, and "symlinks
-v" will show us:
$
symlinks -v -s . messy: /home/tony/varwwwmess -> /var//www dangling: /home/tony/sl2
-> ../incoming lengthy: /home/tony/sl3 -> ../tony/incoming other_fs: /home/tony/varwww
-> /var/www absolute: /home/tony/vhosts -> /home/httpd/vhosts/ relative: /home/tony/webby
-> vhosts/webby.com
That's helpful. Even more helpful is that symlinks can clean this stuff up in
a flash:
$
symlinks -c -s . messy: /home/tony/varwwwmess -> /var//www changed: /home/tony/varwwwmess
-> /var/www dangling: /home/tony/sl2 -> ../incoming lengthy: /home/tony/sl3 ->
../tony/incoming changed: /home/tony/sl3 -> incoming other_fs: /home/tony/varwww
-> /var/www absolute: /home/tony/vhosts -> /home/httpd/vhosts/ changed: /home/tony/vhosts
-> ../httpd/vhosts $ symlinks -v -s . other_fs: /home/tony/varwwwmess -> /var/www
relative: /home/tony/sl3 -> incoming dangling: /home/tony/sl2 -> ../incoming other_fs:
/home/tony/varwww -> /var/www relative: /home/tony/vhosts -> ../httpd/vhosts relative:
/home/tony/webby -> vhosts/webby.com
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The -c fixes all problems, but does leave the dangling link. To remove it:
$
symlinks -d . other_fs: /home/tony/varwwwmess -> /var/www dangling: /home/tony/sl2
-> ../incoming deleted: /home/tony/sl2 -> ../incoming other_fs: /home/tony/varwww
-> /var/www
"symlinks" can operate recursively with "-r" and can show you its actions with
"-t".
*Originally published at APLawrence.com
About the Author:
A.P. Lawrence provides SCO Unix and Linux consulting services http://www.pcunix.com
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