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Full Discussion: Change the content of files but not change the date
Top Forums Shell Programming and Scripting Change the content of files but not change the date Post 302745527 by Scott on Monday 17th of December 2012 12:50:05 PM
Old 12-17-2012
One option is to use touch to create a temporary file with the same timestamp as the original file, then use that to re-touch the original file once you have made your change.

Code:
$ touch -r file1 file1.tmp
$ ll file1*
-rw-r--r--  1 scott  staff   35 27 Nov 07:45 file1
-rw-r--r--  1 scott  staff    0 27 Nov 07:45 file1.tmp
$ vi file1
$ ll file1*
-rw-r--r--  1 scott  staff   36 17 Dec 18:50 file1
-rw-r--r--  1 scott  staff    0 27 Nov 07:45 file1.tmp
$ touch -r file1.tmp file1
$ ll file1*
-rw-r--r--  1 scott  staff   36 27 Nov 07:45 file1
-rw-r--r--  1 scott  staff    0 27 Nov 07:45 file1.tmp

 

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LEARN ABOUT SUSE

xzdiff

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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