topic Re: for loop + shell scripting in Operating System - HP-UX

for loop + shell scripting

network_4 — Tue, 17 Apr 2007 00:47:37 GMT

Hi

Issue is i have a list of files and have to delete all files one by one but i am not able to use for loop. Actually there is one directory where some files like a1, a2 a3 will be there and we have to move files on the basis of lowest seqence file first. So let me know how we can do this.

Re: for loop + shell scripting

Steven E. Protter — Tue, 17 Apr 2007 00:58:15 GMT

Shalom,

How about a while loop

ls -1 > list

filetonotdelete=nodelete.dat

while read -r filename
do
if [ "$filename" != "$filetonotdelete" ]
then
echo "Not deleting $filetonotdelete"
else
echo "Deleting $filename"
rm -f $filename
fi
done < list

SEP

Re: for loop + shell scripting

SANTOSH S. MHASKAR — Tue, 17 Apr 2007 01:20:02 GMT

Hi,

Give details of file sequence & Some examples.

Re: for loop + shell scripting

Steven Schweda — Tue, 17 Apr 2007 01:39:18 GMT

This is not a clear description, but if you
want to keep "a3", you might use something
like this:

$ cat pur.sh
#!/bin/sh

ls -1 $1 | \
(
read c
while [ -n "$c" ] ; do
p="$c"
read c
if [ -n "$c" ] ; then
rm "$p"
fi
done
)

./pur.sh "a*"

But that would break when you got up to
"a10".

Until you can say exactly what you would like
to do, there is not much hope of figuring out
how to do it. After that, it's a lot like
writing a computer program.

Re: for loop + shell scripting

Dennis Handly — Tue, 17 Apr 2007 04:23:27 GMT

>Issue is i have a list of files and have to delete all files one by one

If you know what files you want to save, remove them from your list. Then to remove the rest with:
$ rm -f $( < list-of-files )

(This assumes they fit within the shell's command line.)

Re: for loop + shell scripting

network_4 — Tue, 17 Apr 2007 04:35:25 GMT

Thread Closed

Re: for loop + shell scripting

network_4 — Tue, 17 Apr 2007 04:36:19 GMT

Closed