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10-16-2007
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Diff output, unwanted characters
I've got a diff command running in a shell script that writes the ouput to a new file. In the new file there is a ">" at the beginning of each line. The output file is going to be used by another program and that character makes the file useless.
What I'm getting in the new file: > 2007-09-27 20:23:33.47 EXEC 0B21800A 0A080231 8A000505 00000000 00000000 What it should look like: (absence of the > and a space) 2007-09-27 20:23:33.47 EXEC 0B21800A 0A080231 8A000505 00000000 00000000 Is there a way to avoid this going into the new file from the beginning or will I have to parse out the characters? Thanks in advance, |
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10-16-2007
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Hi. If you have GNU diff of a certain age, you can do something like: Code:
#!/usr/bin/env sh # @(#) s1 Demonstrate diff formatting. set -o nounset echo debug=":" debug="echo" ## Use local command version for the commands in this demonstration. echo "(Versions displayed with local utility "version")" version bash diff echo echo " Data files data1 data2:" cat data1 echo cat data2 echo echo " Standard diff output:" diff data1 data2 echo echo " Suppress old and unchanged lines, output changed plain:" diff --changed-group-format="%>" --unchanged-group-format="" data1 data2 exit 0 Producing: Code:
% ./s1 (Versions displayed with local utility version) GNU bash, version 2.05b.0(1)-release (i386-pc-linux-gnu) diff (GNU diffutils) 2.8.1 Data files data1 data2: a b c e a b d e Standard diff output: 3c3 < c --- > d Suppress old and unchanged lines, output changed plain: d If you have a diff that does not recognize those options, you can filter the output: Code:
#!/usr/bin/env sh # @(#) s2 Demonstrate diff filtering. set -o nounset echo debug=":" debug="echo" ## Use local command version for the commands in this demonstration. echo "(Versions displayed with local utility "version")" version bash diff grep sed echo echo " Data files data1 data2:" cat data1 echo cat data2 echo echo " Filtered diff output:" diff data1 data2 | grep "^>" | sed 's/^> //' exit 0 Which produces: Code:
% ./s2 (Versions displayed with local utility version) GNU bash, version 2.05b.0(1)-release (i386-pc-linux-gnu) diff (GNU diffutils) 2.8.1 grep (GNU grep) 2.5.1 GNU sed version 4.1.2 Data files data1 data2: a b c e a b d e Filtered diff output: d See man diff for details ... cheers, drl |
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10-17-2007
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Code:
diff file1 file2 | sed 's/^> //g' > filename |
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10-17-2007
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Hi, porter. Thanks for that. So my 2nd sequence would be more general as: Code:
diff data1 data2 | grep "^>" | sed 's/^> *//' but that would cause trouble for lines that actually started with a space on IRIX and other systems, so that suggests that on IRIX, one would need a separate version, like: Code:
diff data1 data2 | grep "^>" | sed 's/^>//' Another reason why it's useful to post the flavor of one's OS (and to have someone who has access to a variety of systems) ... cheers, drl Last edited by drl; 10-17-2007 at 05:29 PM.. |
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