determining actual directory of a symlinked directory Post: 302137392

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Top Forums Shell Programming and Scripting determining actual directory of a symlinked directory Post 302137392 by AnswerGuy on Monday 24th of September 2007 06:02:30 PM

09-24-2007

Registered User

Shell script to readlink

Quote:

Originally Posted by chiru_h

Hello all,
I have files at /var/dir1/dir2/fil1.log etc.,.

dir2 is symlinked to /export/xxx/dir3

I am trying to monitor the disk space of the mount where these log files are present.
How do I determine dynamically the actual directory of the log files and corresponding mount when I use df command.

Thanks,
Chiru

The following is a fairly simple little "readlink" shell script using the find command:

Code:

#!/bin/sh
LINK="$1"
until [ -z "$LINK" ]; do
    cd $(dirname "$LINK");
     LAST="$LINK"
     LINK=$(find "$LINK" -maxdepth 0 -printf "%l")
    [ "$LAST" != "$LINK" ] || { echo "Looped Links detected!" >&2 ; exit 1; }
    done
echo $LAST

I won't promise that there isn't some sort of degenerate chain of links on which this would choke. But it works in my tests. I should probably also have put in
a maximum number of links to follow (in case following the look with a
system call such as open would return "-ELOOP").

I'll leave that as an exercise to the student.

JimD (former Linux Gazette AnswerGuy

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dircmp

dircmp(1)						      General Commands Manual							 dircmp(1)

NAME

       dircmp - directory comparison

SYNOPSIS

       n] dir1 dir2

DESCRIPTION

       examines  dir1  and  dir2 and generates various tabulated information about the contents of the directories.  Sorted listings of files that
       are unique to each directory are generated for all the options.	If no option is entered, a sorted list is output  indicating  whether  the
       filenames common to both directories have the same contents.

	      Compare the contents of files with the same name in
		      both  directories  and  output  a list telling what must be changed in the two files to bring them into agreement.  The list
		      format is described in diff(1).

	      Suppress messages about identical files.

	      Change the width of the output line to
		      n characters.  The default width is 72.

EXTERNAL INFLUENCES

   Environment Variables
       LC_COLLATE determines the order in which the output is sorted.

       If is not specified in the environment or is set to the empty string, the value of is used as a default.  If is not specified or is set	to
       the  empty  string,  a  default of ``C'' (see lang(5)) is used instead of If any internationalization variable contains an invalid setting,
       behaves as if all internationalization variables are set to ``C'' (see environ(5)).

   International Code Set Support
       Single- and multi-byte character code sets are supported.

EXAMPLES

       Compare the two directories and and produce a list of changes that would make the directories identical:

WARNINGS

       This command is likely to be withdrawn from X/Open standards. Applications using this command might not be portable to other vendors'  sys-
       tems.  As an alternative is recommended.

SEE ALSO

       cmp(1), diff(1).

STANDARDS CONFORMANCE

																	 dircmp(1)