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| Author |
bourne shell script
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| is there a way to test that something work ie if I diff 2 files is there any
way in the script to tell if the files were the same
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| Eric Enright 2005-09-27, 3:57 am |
| Greg wrote:
> is there a way to test that something work ie if I diff 2 files is there any
> way in the script to tell if the files were the same
Thats what program return codes are for; diff has the following
return codes:
0 No differences were found.
1 Differences were found.
>1 An error occurred.
After executing a program, it's return code is stored in the $?
variable, so:
#!/bin/sh
diff a b > /dev/null
if [ "$?" -ne "0" ]; then
echo "files differ"
fi
HTH,
Eric
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| SM Ryan 2005-09-27, 3:57 am |
| Eric Enright <eric.enright@gmail.com> wrote:
# Greg wrote:
# > is there a way to test that something work ie if I diff 2 files is there any
# > way in the script to tell if the files were the same
#
# Thats what program return codes are for; diff has the following
# return codes:
#
# 0 No differences were found.
# 1 Differences were found.
# >1 An error occurred.
#
# After executing a program, it's return code is stored in the $?
# variable, so:
If all you want is same or different, cmp might run faster than diff.
--
SM Ryan http://www.rawbw.com/~wyrmwif/
Leave it to the Catholics to destroy existence.
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| Rich Teer 2005-09-29, 9:57 pm |
| On Tue, 27 Sep 2005, it was written:
> is there a way to test that something work ie if I diff 2 files is there any
> way in the script to tell if the files were the same
Check the return code from diff.
--
Rich Teer, SCNA, SCSA, OpenSolaris CAB member
President,
Rite Online Inc.
Voice: +1 (250) 979-1638
URL: http://www.rite-group.com/rich
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| Bit Twister 2005-09-29, 9:57 pm |
| On Tue, 27 Sep 2005 13:50:06 +1000, Greg wrote:
> is there a way to test that something work ie if I diff 2 files is there any
> way in the script to tell if the files were the same
if you just want a indicator, use cmp and test return code.
man cmp
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