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Full Discussion: How to sort a file and then print similar lines once
Top Forums Shell Programming and Scripting How to sort a file and then print similar lines once Post 302280714 by joeyg on Tuesday 27th of January 2009 12:21:36 PM
Old 01-27-2009
Tools
Most unix commands and functions relative to files require the input and output files to be different. For safety reasons, but also the issue of how to process a large file at the same time you are doing something to a file.
Typical solution is of the form

Code:
sort file1 >file1.srt
#sometimes put a verification here; just in case
mv file1.srt file1

But, beware of automatically over-writing your original file. If you start with 1000 records, but some part of your command does not quite work as you thought, then you might end up with zero records.
Last edited by joeyg; 01-27-2009 at 01:27 PM..
 

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LEARN ABOUT SUSE

xzcmp

XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME

       xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files

SYNOPSIS

       xzcmp [cmp_options] file1 [file2]
       xzdiff [diff_options] file1 [file2]
       lzcmp [cmp_options] file1 [file2]
       lzdiff [diff_options] file1 [file2]

DESCRIPTION

       xzcmp  and  xdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options specified are passed
       directly to cmp or diff.  If only one file is specified, then the files compared are file1 (which must have a suffix of	a  supported  com-
       pression  format)  and  file1 from which the compression format suffix has been stripped.  If two files are specified, then they are uncom-
       pressed if necessary and fed to cmp(1) or diff(1).  The exit status from cmp or diff is preserved.

       The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils.

SEE ALSO

       cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1)

BUGS

       Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified.

Tukaani 							    2009-07-05								 XZDIFF(1)
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