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how to check links exists proper or not in solaris 10

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Operating Systems Solaris how to check links exists proper or not in solaris 10
# 1  
Old 04-26-2012
how to check links exists proper or not in solaris 10
Hi,
I am using solaris 10 OS and Bash shell.I am looking for the command to check whether link is exits or not.if not i have to create it
Requirement here is say in the server1 i have a directory /spa/5.0.in that directory there are so many links exist.

Example links:
genver -> sa0_genver_releasegenlibs -> sa0_genlibsscripts -> /spa/common/5.0/scriptsfiletran -> /spa/common/5.0/filetrandata -> /spa/common/5.0/dataI have tried following command to find out the links are exist or not.

Code:
ls -lrt|grep machdefs.pl |grep ^llrwxrwxrwx   1 spal     spastaff      11 Apr 10 16:59 AUX_MACHINE_DEFINITION -> machdefs.pl

but i don't know how to find out if the links does not exist or broken.

My Aim here is need to check for the links,if it doesnot exist or broken i need to create the link in a automated script.I am checking for the command to verify it later on i will automate this through scripting.

Appreciate your help on it. Smilie

---------- Post updated at 02:05 AM ---------- Previous update was at 12:06 AM ----------

I have tried with readlink() but no luck. Any help on it?
Last edited by DukeNuke2; 04-26-2012 at 02:21 AM..
# 2  
Old 04-26-2012
To know if a symbolic link points to a file or a directory you can simply use the test -f and test -dcommands.

eg:
Code:
file=/some/name
if [ -L $file -a ! -d $file -a ! -f $file ]
then
  echo "$file is a symlink but doesn't point to a regular file or a directory."
fi

ls -lL will also show up dangling links
This User Gave Thanks to jlliagre For This Post:
muraliinfy04
# 3  
Old 04-26-2012
Broken links have a link count (the 2nd field in ls -ladL) of zero.

Code:
ls -lad abc2
lrwxr-xr-x   1 root       sys              4 Apr 26 16:02 abc2 -> abc1
ls -ladL abc2
----------   0 root       root             0 Jan  1  1970 abc2

This User Gave Thanks to methyl For This Post:
muraliinfy04
# 4  
Old 04-26-2012
@methyl: on what OS are you observing this fake entry ?

On Solaris 10:

Code:
# ls -l foo
lrwxrwxrwx   1 jlliagre jlliagre       8 Apr 26 17:47 foo -> notfound
# ls -ladL foo
foo: No such file or directory

Gnu/Linux has a similar error:
Code:
# ls -ladL foo
ls: cannot access foo: No such file or directory

# 5  
Old 04-26-2012
methyl - something is not kosher
Code:
jmcnama@SNEDAP03 ~> ls foo
foo: No such file or directory
jmcnama@SNEDAP03 ~> ln -s foo newfoo
jmcnama@SNEDAP03 ~> ls -l newfoo
lrwxrwxrwx   1 jmcnama  other          3 Apr 26 10:42 newfoo -> foo
jmcnama@SNEDAP03 ~> ls -Ll newfoo
newfoo: No such file or directory
jmcnama@SNEDAP03 ~>

jlliagre is correct POSIX behavior for ls -L is to report no file found, when the "destination file" for the link does not exist.
Is that an HPUX feature?
# 6  
Old 04-26-2012
Yes, works on HP-UX 11.11. Never noticed on other Operating Systems because I rarely get problems with soft links.

Wrote a script to use this quite recently after needing to move and rename a filesystem and correct various broken links en masse.

I have a quite different and longer script for finding all links to any file which has links (soft or hard) which detects broken links by more conventional methods. It was unsuitable for my recent purpose until after the repair.
# 7  
Old 04-27-2012
Thanks everyone for your responses.Cheers
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