topic Re: shell script!! in Operating System - Linux

shell script!!

ajay_34 — Sun, 26 Dec 2004 22:45:31 GMT

hi all,
i want to write a shell script thats should check size of the given file name. if the file contains zero bytes, remove that file. so any one plz help me. thanks in advance.
ajay.

Re: shell script!!

NiCK_76 — Mon, 27 Dec 2004 00:07:30 GMT

find /yourpath -size 0 -exec rm -f {} \;

Re: shell script!!

ajay_34 — Mon, 27 Dec 2004 01:47:03 GMT

hi nick,
it helped me.thanks for your reply.but i want to use 'if' condition or 'test' command to check the file size and then it should remove the empty files. thanks and regards.
ajay

Re: shell script!!

NiCK_76 — Mon, 27 Dec 2004 02:37:19 GMT

try following command
find ./ -size 0 -exec rm -i {} \;

Re: shell script!!

Georg Tresselt — Mon, 27 Dec 2004 10:06:09 GMT

If you insist on using an if, -s is what comes closest to your demand. [ -s ] checks if a file exists and is larger than 0. So you would have to delete all files that fail that test.

Re: shell script!!

Deepak_22 — Thu, 30 Dec 2004 11:54:04 GMT

#!/bin/sh
File_List=`ls`
for File_Name in $File_List
do
File_Size=`ls -ld $File_Name | awk '{ print $5}'`
if [ $File_Size == 0 ] ; then
echo $File_Name::$File_Size
rm -i $File_Name
fi
done

Re: shell script!!

Ross Minkov — Sat, 01 Jan 2005 11:08:52 GMT

From the bash man page (man bash):

Conditional expressions are used by the [[ compound command and the test and [ builtin commands to test file attributes and perform string and arithmetic comparisons.

-s file ==> True if file exists and has a size greater than zero.

Regards,
Ross

Re: shell script!!

ajay_34 — Sun, 02 Jan 2005 23:32:57 GMT

thanks deepak.this is the script what exactly i was looking for.
thanks to all who given me suggestions.

regards,
ajay

Re: shell script!!

Stuart Browne — Mon, 03 Jan 2005 18:47:15 GMT

Georg and Ross actually gave you a better solution.

If using bash, certainly [[/]] with '-s' is the fastest solution, but if you want multi-platform, it's not the best.

The 'test' ([) application has the '-s' option as well, and it is fully multiplatform:

if [ -s /file/name.here ]
then
rm -f /file/name.here
fi

Re: shell script!!

ajay_34 — Sun, 09 Jan 2005 22:33:01 GMT

hi browne,

i tryed your script but it dint work browne .y i dont know.it cant delete the empty file. anyway thanks.

ajay

Re: shell script!!

Ross Minkov — Sun, 09 Jan 2005 23:44:14 GMT

Ajay,

Try this code below. I think Stewart missed one "!".

==============================
#!/bin/bash
if [ ! -s emptyfile ]
then
echo "deleting emptyfile"
rm -f emptyfile
fi
===============================

Again from the bash man page (man bash):

Conditional expressions are used by the [[ compound command and the test and [ builtin commands to test file attributes and perform string and arithmetic comparisons.

-s file ==> True if file exists and has a size greater than zero.

HTH,
Ross

Re: shell script!!

Stuart Browne — Mon, 10 Jan 2005 00:51:37 GMT

yup, I screwed up, my apologies.

Re: shell script!!

ajay_34 — Thu, 13 Jan 2005 20:28:24 GMT

hi Ross Minkov and Stuart Browne,
thanks for your support. your suggestions helped me.slowly i am learning shell scripting.your suggestions helped me to think in different way.

thanks once again

regards,
ajay