File processing
Donn Cave
donn at drizzle.com
Tue Jul 10 01:16:10 EDT 2001
Quoth Skip Montanaro <skip at pobox.com>:
|
| Chris> I'm trying to write a script that will open a file, delete the
| Chris> first line, and then save the file with the same name. Can
| Chris> someone please point me in the right direction? Thanks!
|
| Well, you've seen several Python examples and a Matlab example. I usually
| use the shell for these sorts of quick-n-dirty file manipulations:
|
| i=`wc -l <somefile`
| i=`expr $i - 1`
| tail -$i somefile > somefile.short
|
| Put that in a loop and you're all set:
|
| for f in `whole buncha files` ; do
| i=`wc -l <$f`
| i=`expr $i - 1`
| tail -$i $f > $f.tmp
| # cp -p $f $f.save # if you're paranoid
| mv $f.tmp $f
| done
That's cool, but you might be interested to see if tail on
your platform supports a positive index (bet it does):
for f in `whole buncha files`
do
if tail +1 $f > $f.tmp
then mv $f.tmp $f
else rm $f.tmp
fi
done
In the unlikely event it doesn't, sed '1d' is a safe bet.
Donn Cave, donn at drizzle.com
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