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Full Discussion: grep -v -f xxxxxxx
Top Forums Shell Programming and Scripting grep -v -f xxxxxxx Post 12030 by peter.herlihy on Monday 17th of December 2001 05:48:36 PM
Old 12-17-2001
Network grep -v -f xxxxxxx

I've got the code below. It does it's job but it's scrappy. Can someone explain why grep -v -f doesn't work against an empty file?

Basically I have a file of presumed good data - I want to remove any by comparing with a file I know are bad. When the bad file is empty - the output file is also empty. It's weird.

Works fine when the bad file has some data - so you'll see the cheap hack fix I've put in.


if [ -s tmp.merge.nos ]
then
join -t, -v 1 tmp.both tmp.req.merges | sed 's/=/,/' | grep -v -f tmp.merge.nos > $infile.ready
else
join -t, -v 1 tmp.both tmp.req.merges | sed 's/=/,/' > $infile.ready
fi

Maybe comm would be better - but I'd like to know why it doesn't work anyway (grep -v -f). CheersSmilie
 

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GIT-MERGE-FILE(1)						    Git Manual							 GIT-MERGE-FILE(1)

NAME
git-merge-file - Run a three-way file merge SYNOPSIS
git merge-file [-L <current-name> [-L <base-name> [-L <other-name>]]] [--ours|--theirs|--union] [-p|--stdout] [-q|--quiet] [--marker-size=<n>] [--[no-]diff3] <current-file> <base-file> <other-file> DESCRIPTION
git merge-file incorporates all changes that lead from the <base-file> to <other-file> into <current-file>. The result ordinarily goes into <current-file>. git merge-file is useful for combining separate changes to an original. Suppose <base-file> is the original, and both <current-file> and <other-file> are modifications of <base-file>, then git merge-file combines both changes. A conflict occurs if both <current-file> and <other-file> have changes in a common segment of lines. If a conflict is found, git merge-file normally outputs a warning and brackets the conflict with lines containing <<<<<<< and >>>>>>> markers. A typical conflict will look like this: <<<<<<< A lines in file A ======= lines in file B >>>>>>> B If there are conflicts, the user should edit the result and delete one of the alternatives. When --ours, --theirs, or --union option is in effect, however, these conflicts are resolved favouring lines from <current-file>, lines from <other-file>, or lines from both respectively. The length of the conflict markers can be given with the --marker-size option. The exit value of this program is negative on error, and the number of conflicts otherwise. If the merge was clean, the exit value is 0. git merge-file is designed to be a minimal clone of RCS merge; that is, it implements all of RCS merge's functionality which is needed by git(1). OPTIONS
-L <label> This option may be given up to three times, and specifies labels to be used in place of the corresponding file names in conflict reports. That is, git merge-file -L x -L y -L z a b c generates output that looks like it came from files x, y and z instead of from files a, b and c. -p Send results to standard output instead of overwriting <current-file>. -q Quiet; do not warn about conflicts. --diff3 Show conflicts in "diff3" style. --ours, --theirs, --union Instead of leaving conflicts in the file, resolve conflicts favouring our (or their or both) side of the lines. EXAMPLES
git merge-file README.my README README.upstream combines the changes of README.my and README.upstream since README, tries to merge them and writes the result into README.my. git merge-file -L a -L b -L c tmp/a123 tmp/b234 tmp/c345 merges tmp/a123 and tmp/c345 with the base tmp/b234, but uses labels a and c instead of tmp/a123 and tmp/c345. GIT
Part of the git(1) suite Git 1.8.5.3 01/14/2014 GIT-MERGE-FILE(1)
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