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Full Discussion: rename files Ax based on strings found in files Bx
Top Forums Shell Programming and Scripting rename files Ax based on strings found in files Bx Post 302360620 by steadyonabix on Friday 9th of October 2009 01:30:53 PM
Old 10-09-2009
Bug Solution
Hi Inch

Well this turned out to be more interesting than I originally thought it would be: -

When I got your file I found it would not behave with awk or sed or any of the usual utilities so I took a look at its internal structure by doing an octal dump of the contents.
Here is the part containing your start string with the individual letters highlighted in bold: -

Code:
TX5XN:/home/brad/forum/inch>od -c FP00000.SHD | pg                                                                                                                   

0003440   H   & 375 032 001 002  \0  \0   b  \0   v  \0   i  \0   w  \0
0003460   a  \0   c  \0   s  \0  \0  \0   b  \0   v  \0   i  \0   w  \0
0003500   a  \0   c  \0   s  \0  \0  \0   s  \0   m  \0   u  \0   A  \0

As you can see each letter is delimited by a number 0 or null, so anything like awk or sed will fail as they look for string based files, not null delimited chars.
This is why your original paste of the file contained so many unprintable characters and spaces between each letter of your target string.

Having established the problem it is now a simple fix, just remove the nulls prior to manipulating the strings: -

Code:
TX5XN:/home/brad/forum/inch>tr -d "\000" < FP00000.SHD | strings
Adobe PDF
PRIV
EBDA
Standard
bviwacsbviwacssmuAB462691_200908148 19 27 296 - BerichtAdobe PDFAdobe PDF ConverterWinPrintNT EMF 1.008\\PC267IWACS

So adding the stripping of the nulls to the tool gives us the ability to correctly process the string we want to turn into a file name: -

Code:
TX5XN:/home/brad/forum/inch>inch
TX5XN:/home/brad/forum/inch>ls -l
total 168
-rw-r--r-- 1 brad root  2080 2009-08-14 20:10 FP00000.SHD
-rw-r--r-- 1 brad root 75368 2009-10-08 11:46 FP00000.SPL
-rwxrwxrwx 1 brad root   696 2009-10-09 17:48 inch
-rw-r--r-- 1 brad root 75368 2009-10-09 17:48 smuAB462691_2009081481927296-Berich.SPL

Here is the modified code: -

Code:
ls *.SHD | while read FILE_NAME
do
    if [[ -w ${FILE_NAME%.*}.SPL ]]    ## Ignore any file with no .SPL file
    then
        NEW_FILE_NAME=$( tr -d "\000" < $FILE_NAME | strings | nawk ' BEGIN {
            ## Spaces in target strings ????
            first = "viwacsbviwacs"
            last = "Adobe"
        }
        ( $0 ~ first ) && ( $0 ~ last ) {
            startm = index( $0, first ) + length( first )
            endm = index( $0, last ) - 1
            file_name = substr( $0, startm, endm - startm )
        } END {
            ## Remove spaces from new file name
            gsub( / /, "", file_name )    
            print file_name
        } ' ).SPL

        ## Copy. change cp to mv if required
        cp ${FILE_NAME%.*}.SPL $NEW_FILE_NAME
    else
        echo "File ${FILE_NAME} has no matching .SPL file"
    fi
done

Note there is no real error checking for existing files etc, I will leave you to add that yourself.
You should also note it needs to be run in the target directory so you will need to modify it if you want to handle multiple directories etc.
Until you add this kind of validation I would copy the files into a work directory and process them there first to avoid any unfortunate mishaps or lost data.

Hope it is usefull.........
Last edited by steadyonabix; 10-09-2009 at 02:39 PM.. Reason: Format text
 

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