01-06-2008
Quote:
I suggest that the files be sorted and diff be run once on the two files (post #8, rikxik). That will be 2 passes across each file, a decrease of close to 100% from 15M passes over 1 file.
Hi drl - I was wondering whether there is any reason/performance gain (for diff) if we sort the files? Is it essential/necessary? Just thinking aloud.
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LEARN ABOUT XFREE86
zdiff
ZDIFF(1) General Commands Manual ZDIFF(1)
NAME
zcmp, zdiff - compare compressed files
SYNOPSIS
zcmp [ cmp_options ] file1 [ file2 ]
zdiff [ diff_options ] file1 [ file2 ]
DESCRIPTION
Zcmp and zdiff are used to invoke the cmp or the diff program on files compressed via gzip. All options specified are passed directly to
cmp or diff. If only file1 is specified, it is compared to the uncompressed contents of file1.gz. If two files are specified, their con-
tents (uncompressed if necessary) are fed to cmp or diff. The input files are not modified. The exit status from cmp or diff is pre-
served.
SEE ALSO
cmp(1), diff(1), zmore(1), zgrep(1), znew(1), zforce(1), gzip(1), gzexe(1)
BUGS
Messages from the cmp or diff programs may refer to file names such as "-" instead of to the file names specified.
ZDIFF(1)