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Need to rename file based on name in same file

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# 1  
Old 01-13-2011
Need to rename file based on name in same file
Good day.

I need a one-liner (if possible) otherwise a longer script to do the following:

I have a list of files in a directory with the same filename extension, ie.

Code:
firstfile.cks, anotherfile.cks, somefile.cks, etc.

The filename and extension, however, are incorrect. The correct filename is contained on the only line inside each file:

Code:
# cat firstfile.cks
747339843       15691264        PS0001.pkg

# cat anotherfile.cks
2451811218     23460352       PS0002.pkg

# cat somefile.cks
172067168       15546368        PS0003.pkg

So, what I need is some script to search for all files *.cks, select the correct filename and adding a new filename extension ".cksum"; ie:

Code:
'firstfile.cks' becomes 'PS0001.pkg.cksum'.
'anotherfile.cks' becomes 'PS0002.pkg.cksum' and
'somefile.cks' becomes 'PS0003.pkg.cksum'

Thanks in advance,
Bjoern
# 2  
Old 01-13-2011
Try it first without the coloured part to make sure the commands are correct:
Code:
awk '{print "mv " FILENAME " " $NF ".cksum"}' *.cks | sh

# 3  
Old 01-13-2011
Code:
 find . -name "*.cks" -print | while read fname; do mv $fname "`tail -1 $fname | awk '{ print $3 }'`".cksum; done

# 4  
Old 01-13-2011
Code:
for i in *.cks
do
  read x x toname < "$i"
  mv "$i" "$toname.cksum"
done

Code:
grep . *.cks | 
while IFS="$IFS:" read from x x toname
do
  mv "$from" "$toname.cksum"
done

Last edited by Scrutinizer; 01-13-2011 at 04:39 PM..
# 5  
Old 01-13-2011
Quote:
Originally Posted by citaylor
Code:
 find . -name "*.cks" -print | while read fname; do mv $fname "`tail -1 $fname | awk '{ print $3 }'`".cksum; done

Thanks citaylor.

Your solution worked on some files and not others. I ran the commands in debug mode and substituted 'mv' for 'echo' to see what was happening.:
Code:
+ read fname
++ tail -1 ./14__002c.cks
++ nawk '{ print $3 }'
+ echo ./14__002c.cks 14.01.00.11_PS0013.pkg.cksum
./14__002c.cks 14.01.00.11_PS0013.pkg.cksum

This one worked fine, but the next one did something unexpected:
Code:
+ read fname
++ tail -1 ./fa__002e.cks
++ nawk '{ print $3 }'
+ echo ./fa__002e.cks $'fa_netra-10s_3.18.pkg.gz\r.cksum'
.cksum002e.cks fa_netra-10s_3.18.pkg.gz

How on earth did the '\r' get in there?

Regards,
Bjoern
# 6  
Old 01-13-2011
The files have been transferred from a Windows/DOS system and have carriage returns on the end of each line ?
# 7  
Old 01-14-2011
Quote:
Originally Posted by citaylor
The files have been transferred from a Windows/DOS system and have carriage returns on the end of each line ?
Bingo! Thanks a lot citaylor. I thought that all the ^M had already been removed.

Thanks.
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