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Full Discussion: CMP two files with slight difference and return code
Top Forums Shell Programming and Scripting CMP two files with slight difference and return code Post 302244538 by gugs on Wednesday 8th of October 2008 06:15:37 AM
Old 10-08-2008
CMP two files with slight difference and return code
I am comparing two files which are identical except for the timestamp which is incorporated within the otherwise same 372 bytes. I am using the command:

cmp -s $Todays_file $Yesterdays_file -i 372

When I run the command without the -i 372 it shows the difference i.e. the timestamp. However, with -i 372 it works as expected displays no differences as it ignores the first 372 bytes.

However, in both cases the return code is set to 1. I was hoping that in the second case the return code would be set to 0 i.e. no changes as we are ignoring the first 372 bytes.

I do some further processing based on the return code. Is there a way I can compare the two files?
 

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LEARN ABOUT REDHAT

split

SPLIT(1)								FSF								  SPLIT(1)

NAME

       split - split a file into pieces

SYNOPSIS

       split [OPTION] [INPUT [PREFIX]]

DESCRIPTION

       Output  fixed-size  pieces  of  INPUT  to PREFIXaa, PREFIXab, ...; default PREFIX is `x'.  With no INPUT, or when INPUT is -, read standard
       input.

       Mandatory arguments to long options are mandatory for short options too.

       -a, --suffix-length=N
	      use suffixes of length N (default 2)

       -b, --bytes=SIZE
	      put SIZE bytes per output file

       -C, --line-bytes=SIZE
	      put at most SIZE bytes of lines per output file

       -l, --lines=NUMBER
	      put NUMBER lines per output file

       --verbose
	      print a diagnostic to standard error just before each output file is opened

       --help display this help and exit

       --version
	      output version information and exit

       SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg.

AUTHOR

       Written by Torbjorn Granlund and Richard M. Stallman.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full  documentation  for split is maintained as a Texinfo manual.  If the info and split programs are properly installed at your site,
       the command

	      info split

       should give you access to the complete manual.

split (coreutils) 4.5.3 					   February 2003							  SPLIT(1)
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