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Top Forums Shell Programming and Scripting how to get the variable in while loop outside of it? Post 302571231 by BMDan on Sunday 6th of November 2011 11:38:05 PM
Old 11-07-2011
Code:
bash-3.00$ cat compare.sh
#NOTE : 1.Filename must not have space for the script to work.
#       2.Script wont work if symlinks are there instead of proper filenames.

#!/bin/bash
#set -x

#############################VERIFYING THE EXISTENCE OF DUPLICATE FILENAMES IN THE SUPPLIED FILENAMES ###############

if [[ $# -lt 1 ]];then
echo "Usage : `basename $0` filename" 1>&2
exit 2
fi
awk '{f=$9;
        for(i=10;i<=NF;i++)
           f=f&quot; &quot;$i;
           d[f]++;
     }
END{
        for(f in d)
                if(d[f] > 1)
                 printf(&quot;file %s occurs %d times\n&quot;,f,d[f]);
                                                    }' `basename $1`
echo -e  &quot;Please remove the dupliacte entries,\
\nkeep the file with the latest timestamp and check again&quot;

################################CHECKING SIZE,DATE,TIME,FILENAME WITH THE EXISTING FILES############################

status=0
cat $1 | awk '{print  $(NF-4),&quot;\t&quot;,$(NF-3),&quot;\t&quot;,$(NF-2),&quot;\t&quot;,$(NF-1),&quot;\t&quot;,$(NF)}'  | \
while read size mon day time filename; do
    if [[ ! -f &quot;$filename&quot; ]]; then
        echo &quot;ERROR: no such file: $filename&quot; >&2
        status=1
    else
        filesize=$(ls -lrt &quot;$filename&quot; | awk '{print $5}')
        if [[ &quot;$size&quot; != &quot;$filesize&quot; ]]; then
            echo &quot;ERROR: size mismatch: $filename&quot; >&2
            status=1
        else
           # filetime=$(ls -lrt &quot;$filename&quot; | awk  '{print $6,&quot; &quot;,$7,&quot; &quot;,$8}')
                actual_mon=$(ls -lrt &quot;$filename&quot; | awk '{print $6}')
                actual_day=$(ls -lrt &quot;$filename&quot; | awk '{print $7}')
                actual_time=$(ls -lrt &quot;$filename&quot; | awk '{print $8}')
            if [[ &quot;$mon $day $time&quot; != &quot;$actual_mon $actual_day $actual_time&quot; ]]; then
                echo &quot;ERROR: date mismatch: $filename&quot; >&2
                status=1
            fi
        fi
    fi
done
echo $status
if [[ &quot;$status&quot; -eq 0 ]];then
echo -e &quot;\t\n\nSuccess! All the files are found and their size  and timestamp is also matching with the existing files.&quot;
else
echo -e &quot;\t\n\nFailure! Non-matching files are found or file doesn't exist.&quot;
fi

Check out Variable Scope in Bash (NuclearDonkey.net) for one of several possible solutions here. Essentially, the issue is that you're modifying variables in a sub-process. You'll either need some inter-process trickery, or you'll have to modify your code to eliminate the direct use of the pipeline.

Also, please use [code] tags, as they make things much, much easier to read.
This User Gave Thanks to BMDan For This Post:
 

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FILESIZE(3)								 1							       FILESIZE(3)

filesize - Gets file size

SYNOPSIS
int filesize (string $filename) DESCRIPTION
Gets the size for the given file. PARAMETERS
o $filename - Path to the file. RETURN VALUES
Returns the size of the file in bytes, or FALSE (and generates an error of level E_WARNING) in case of an error. Note Because PHP's integer type is signed and many platforms use 32bit integers, some filesystem functions may return unexpected results for files which are larger than 2GB. EXAMPLES
Example #1 filesize(3) example <?php // outputs e.g. somefile.txt: 1024 bytes $filename = 'somefile.txt'; echo $filename . ': ' . filesize($filename) . ' bytes'; ?> ERRORS
/EXCEPTIONS Upon failure, an E_WARNING is emitted. NOTES
Note The results of this function are cached. See clearstatcache(3) for more details. Tip As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to "Supported Protocols and Wrappers" to determine which wrappers support stat(3) family of functionality. SEE ALSO
file_exists(3). PHP Documentation Group FILESIZE(3)
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