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Top Forums Shell Programming and Scripting HELP on checking for directory or symbolic link Post 302694977 by newbie_01 on Friday 31st of August 2012 08:39:52 PM
Old 08-31-2012
Quote:
Originally Posted by methyl
Nearly there but the echo statements do not match the tests. The Conditional Expression syntax "[[ .....]]" is not needed.

Code:
#!/bin/ksh

for checkdir in dir*
do
   echo "Checking ${checkdir}"

   if [ -h "${checkdir}" ] ; then
      echo "... ${checkdir} is a symbolic link"
   elif [ -d "${checkdir}" ] ; then
      echo "... ${checkdir} is a directory"
   fi
done


Thanks a lot methyl, that is so very embarrassing SmilieSmilie ....

All good now ... still stumped on why the -d returns true for a symbolic link though, it's like it is trying to check whether the link that the symlink is set to is a directory.

I can live with doing the -h then the -d for the time being ... thanks again for pointing out my mistakes ... need to grab some more coffee I guess

Below is an example where I create another symbolic link but the actual directory /tmp/x does not exist and my original script works like how I want it to. Any chance that there is a test where it will not try and resolve what the symbolic link is linking to?

Code:
tmp $: ./x.ksh
Checking dir1
... dir1 is a directory
Checking dir2
... dir2 is a directory
Checking dir3
... dir3 is a directory
Checking dir4
... dir4 is a symbolic link
tmp $: cat x.ksh
#!/bin/ksh

for checkdir in dir*
do
   echo "Checking ${checkdir}"

   if [[ -d "${checkdir}" ]] ; then
      echo "... ${checkdir} is a directory"
   elif [[ -h "${checkdir}" ]] ; then
      echo "... ${checkdir} is a symbolic link"
   fi
done
tmp $: ls -ltrd /tmp
drwxrwxrwt  79 root     root      221472 Sep  1 12:41 /tmp
tmp $: ls -ltrd /tmp/x
/tmp/x: No such file or directory
tmp $:


Last edited by newbie_01; 08-31-2012 at 09:45 PM.. Reason: More info
 

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symlink(4)						     Kernel Interfaces Manual							symlink(4)

NAME
symlink - symbolic link DESCRIPTION
A symbolic (or soft ) link is a file whose name indirectly refers (points) to a relative or absolute path name. During path name interpretation, a symbolic link to a relative path name is expanded to the path name being interpreted, and a symbolic link to an absolute path name is replaced with the path name being interpreted. Thus, given the path name If is a symbolic link to a relative path name such as the path name is interpreted as If is a symbolic link to an absolute path name such as the path name is interpreted as All symbolic links are interpreted in this manner, with one exception: when the symbolic link is the last component of a path name, it is passed as a parameter to one of the system calls: or (see readlink(2), rename(2), symlink(2), unlink(2), chown(2) and lstat(2)). With these calls, the symbolic link, itself, is accessed or affected. Unlike normal (hard) links, a symbolic link can refer to any arbitrary path name and can span different logical devices (volumes). The path name can be that of any type of file (including a directory or another symbolic link), and may be invalid if no such path exists in the system. (It is possible to make symbolic links point to themselves or other symbolic links in such a way that they form a closed loop. The system detects this situation by limiting the number of symbolic links it traverses while translating a path name.) The mode and ownership of a symbolic link is ignored by the system, which means that affects the actual file, but not the file containing the symbolic link (see chmod(1)). Symbolic links can be created using or (see ln(1) and symlink(2)). AUTHOR
was developed by HP and the University of California, Berkeley. SEE ALSO
cp(1), symlink(2), readlink(2), link(2), stat(2), mknod(1M). symlink(4)
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