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Bash on Symbolic Links & Targets of Symbolic Links

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RSH

Joined: 05 Sep 2011
Posts: 1564
Location: Germany

Posted: Fri 13 Apr 2012, 01:00 Post subject:

Bash on Symbolic Links & Targets of Symbolic Links

Hi,

i want to search/find symbolic links in a directory. The following code finds only files

Code:

Files=`find $TrApps0 -type f`

but i want to find only symbolic links.

What do i have to change?

Then, if symbolic links have been found, i want to get the target of the symbolic link, so i can remove the symbolic link and copy/move the target to previous location of the symbolic link.

How can if get the target of a symbolic link?

All for the use with bash...

Thanks
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Ibidem

Joined: 25 May 2010
Posts: 262

Posted: Fri 13 Apr 2012, 02:00 Post subject:

Use the options

Code:

-P -type l

insead of -type f.

I found this around line 630 on the man page.

RSH

Joined: 05 Sep 2011
Posts: 1564
Location: Germany

Posted: Fri 13 Apr 2012, 02:39 Post subject:

Ibidem wrote:

Use the options

Code:

-P -type l

insead of -type f.

I found this around line 630 on the man page.

-P gives error message: unknown predicate `-P`

Code:

-type l

finds the symbolic link Cool

I do know -P from cp (do not follow symbolic links), so i can use cp without -P, so it follows the symbolic link and then i can copy the target to /tmp, remove the symbolic link and then move the target from /tmp to the previous location of the (now removed) symbolic link.

Should work - after some work. Laughing

Thanks!

EDIT:

TestScript did work!

Code:

#!/bin/sh

dir=/root/Testdir
dir2=/root/Testdir2

Files=`find $dir -type l`
echo "$Files" |while read F
do
bn=`basename "$F"`
echo "$F"
cp -P $F $dir2/$bn
#cp $F $dir2/$bn
done

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sunburnt

Joined: 08 Jun 2005
Posts: 4016
Location: Arizona, U.S.A.

Posted: Fri 13 Apr 2012, 03:43 Post subject:

Both these work too.

Code:

ls -l ( File, Dir., or Link ) |grep ^l
[ -L ( File, Dir., or Link ) ]&& echo LINK

Bruce B

Joined: 18 May 2005
Posts: 10824
Location: The Peoples Republic of California

Posted: Fri 20 Apr 2012, 21:11 Post subject:

Here is one I just worked on

Code:

ls -l | grep ^l | awk '{print $8" "$9" "$10}'

outputs like this:

erasecd -> blankcd
protect -> /sbin/pup_event_backend_modprobe_protect
routines -> /routines.sh
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technosaurus

Joined: 18 May 2008
Posts: 3845

Posted: Sat 21 Apr 2012, 00:59 Post subject:

Bruce B wrote:

Code:

ls -l | grep ^l | awk '{print $8" "$9" "$10}'

or without grep

Code:

ls -l|awk '/^l/{print $8" "$9" "$10}'

for find you can use -type l
(then readlink)
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Karl Godt

Joined: 20 Jun 2010
Posts: 2737
Location: Kiel,Germany

Posted: Sat 21 Apr 2012, 15:42 Post subject:

Code:

ls -1F |grep '@$'

could give something like
include@
spool@
var@
X11@
X11R6@

I tend to use the find command, too,
but to always filter the often unneeded "./" and "." is annoying to me .

*
find has got the

The -H, -L and -P options control the treatment of symbolic links.

OPTIONS

which have to go like "find -H /usr -type l -mmin -60" .
( -mmin -N says to find links modified (ie rm and created new) not older than 60min, -mmin 60 should find oler than 60min ; same for -amin(access time) and -cmin(change time(mod time or chmod time))||-mtime for (N*24)days) )

The manpage of find is really large for the part on -H, -L and -P options .

*
Another binary to look at would be readlink , i think :

Code:

for item in *;do echo -n "$item: " ;S_RL=`readlink $item`;case $item in "")echo;;*)echo "$S_RL";;esac;done

should give something like
bin:
etc:
i486-t2-linux-gnu:
include: include_orig/
include_latest:
include_orig:
info:
lib:
libexec:
link_include_switch.sh:
local:
man:
sbin:
share:
spool: /var/spool
tmp:
var: ../var
X11: X11R6
X11R6: X11R7
X11R7:

*
readlink -e would be used like

Code:

for item in *;do echo -n "$item: " ;readlink -e $item;done

bin: /usr/bin
etc: /usr/etc
i486-t2-linux-gnu: /usr/i486-t2-linux-gnu
include: /usr/include_orig
include_latest: /usr/include_latest
include_orig: /usr/include_orig
info: /usr/info
lib: /usr/lib
libexec: /usr/libexec
link_include_switch.sh: /usr/link_include_switch.sh
local: /usr/local
man: /usr/man
sbin: /usr/sbin
share: /usr/share
spool: /var/spool
tmp: /usr/tmp
var: /var
X11: /usr/X11R7
X11R6: /usr/X11R7
X11R7: /usr/X11R7

NOTE : The links are distinguishable by the difference of the `pwd` or dirname command to obtain the current dir ( /usr/ in this case ) or the difference in the basename (command) .

Bruce B

Joined: 18 May 2005
Posts: 10824
Location: The Peoples Republic of California

Posted: Sat 21 Apr 2012, 15:45 Post subject:

technosaurus wrote:

Bruce B wrote:

Code:

ls -l | grep ^l | awk '{print $8" "$9" "$10}'

or without grep

Code:

ls -l|awk '/^l/{print $8" "$9" "$10}'

Better, thanks.
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