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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 302244714 by drl on Wednesday 8th of October 2008 12:42:21 PM
Old 10-08-2008
Hi.

The GNU cmp seems to work for me:
Code:
#!/bin/bash -

# @(#) s1       Demonstrate cmp, skipping initial bytes.

echo
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) cmp
set -o nounset
echo

FILE1=data1
FILE2=data2

echo " Data file $FILE1:"
cat $FILE1

echo
echo " Data file $FILE2:"
cat $FILE2

echo
echo " Results for comparison of entire files:"
cmp $FILE1 $FILE2
echo " Exit code is $?"

echo
echo " Results for comparison of files past byte 5:"
cmp -i 5 $FILE1 $FILE2
echo " Exit code is $?"

echo
echo " Results for comparison options in non-standard order:"
cmp $FILE1 $FILE2 -i 5
echo " Exit code is $?"

exit 0

Producing:
Code:
% ./s1

(Versions displayed with local utility "version")
Linux 2.6.11-x1
GNU bash 2.05b.0
cmp (GNU diffutils) 2.8.1

 Data file data1:
junk1 in this line.
hello, world.

 Data file data2:
junk2 in this line.
hello, world.

 Results for comparison of entire files:
data1 data2 differ: char 5, line 1
 Exit code is 1

 Results for comparison of files past byte 5:
 Exit code is 0

 Results for comparison options in non-standard order:
 Exit code is 0

Are you taking into account that the exit code is reset for each command? ... cheers, drl
 

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LEARN ABOUT FREEBSD

cmp

CMP(1)							    BSD General Commands Manual 						    CMP(1)

NAME

     cmp -- compare two files

SYNOPSIS

     cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]

DESCRIPTION

     The cmp utility compares two files of any type and writes the results to the standard output.  By default, cmp is silent if the files are the
     same; if they differ, the byte and line number at which the first difference occurred is reported.

     Bytes and lines are numbered beginning with one.

     The following options are available:

     -h      Do not follow symbolic links.

     -l      Print the byte number (decimal) and the differing byte values (octal) for each difference.

     -s      Print nothing for differing files; return exit status only.

     -x      Like -l but prints in hexadecimal and using zero as index for the first byte in the files.

     -z      For regular files compare file sizes first, and fail the comparison if they are not equal.

     The optional arguments skip1 and skip2 are the byte offsets from the beginning of file1 and file2, respectively, where the comparison will
     begin.  The offset is decimal by default, but may be expressed as a hexadecimal or octal value by preceding it with a leading ``0x'' or
     ``0''.

EXIT STATUS

     The cmp utility exits with one of the following values:

     0	   The files are identical.

     1	   The files are different; this includes the case where one file is identical to the first part of the other.	In the latter case, if the
	   -s option has not been specified, cmp writes to standard error that EOF was reached in the shorter file (before any differences were
	   found).

     >1    An error occurred.

SEE ALSO

     diff(1), diff3(1)

STANDARDS

     The cmp utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.  The -h, -x, and -z options are extensions to the standard.

HISTORY

     A cmp command appeared in Version 1 AT&T UNIX.

BSD
								 November 18, 2013							       BSD
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