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Full Discussion: Awk: System command not working in awk
Top Forums Shell Programming and Scripting Awk: System command not working in awk Post 302925784 by Corona688 on Wednesday 19th of November 2014 10:37:14 AM
Old 11-19-2014
It's perilous to alter your originals. One mistake and you've trashed all your input data. I would begin by renaming all your files to FILENAME".tmp" and create new ones with the original filenames instead; delete your originals once you've tested the new data and have made sure it's worked to your satisfaction.

END does not work that way, it runs once and only once, after the very last file is read. You need to watch for the filename changing instead. Or, better yet, move that function outside of awk.

It's safe and normal to rename a file while you have it open, on UNIX. I've tested this and it will end up with the originals in *.tmp and the new files in *.prc. It will warn you about running it twice in a row without checking the data.

Code:
for FILE in *.tmp
do
        [ -f "$FILE" ] || break
        echo ".tmp files remaining from last run -- check and delete if originals OK" >&2
        exit 1
done

awk -v OFS="|" '(!F) || (F != FILENAME) { if(F) close(F) ; F=FILENAME ; system("mv "F" "F".tmp"); }  { print ... > F }' *.ext

 

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LEARN ABOUT DEBIAN

git-merge-file

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>]
	       <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.

       --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 1.7.10.4							    11/24/2012							 GIT-MERGE-FILE(1)
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