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Full Discussion: How to compare files in two folders using cmp?
Top Forums Shell Programming and Scripting How to compare files in two folders using cmp? Post 302455894 by rubin on Wednesday 22nd of September 2010 04:32:33 PM
Old 09-22-2010
Quote:
Originally Posted by fuzzylogic25
...
1. Is CMP the right command to use to compare (verify identical data) of two files regardless of its type? eg video, document, executable, zip, encrypted file etc
Yes, 'cmp' does a byte by byte comparison of two files.

Quote:
Originally Posted by fuzzylogic25
2. How would you write a quick shell script to compare two folders?
One way would be ...
Code:
# Build first the lists to be compared:

	find /media/ntfsdrive/data/ /media/ext4drive/data/ -type f  |
               awk '/\/media\/ntfsdrive\/data\// { print > "list_1" }
                    /\/media\/ext4drive\/data\// { print > "list_2" }' 
	
# Do the actual comparison with 'cmp', ( assuming no whitespaces in the filenames ):

	 awk '{ getline s < "list_2"; print "cmp", $0, s }' list_1 | sh

Note that one list's filenames have to be in precise order with their counterparts in the other list, for 'cmp' to work correctly.
 

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LEARN ABOUT HPUX

gzcmp

GZDIFF(1)						      General Commands Manual							 GZDIFF(1)

NAME

       gzcmp, gzdiff - compare compressed files

SYNOPSIS

       gzcmp [ cmp_options ] file1 [ file2 ]
       gzdiff [ diff_options ] file1 [ file2 ]

DESCRIPTION

       gzcmp  and  gzdiff are used to invoke the cmp or the diff program on compressed files.  All options specified are passed directly to cmp or
       diff.  If only 1 file is specified, then the files compared are file1 and an uncompressed file1.gz.  If two files are specified, then  they
       are uncompressed if necessary and fed to cmp or diff.  The exit status from cmp or diff is preserved.

SEE ALSO

       cmp(1), diff(1), gzmore(1), gzgrep(1), gznew(1), gzforce(1), gzip(1), gzexe(1)

BUGS

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

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWgzip	      |
       +--------------------+-----------------+
       |Interface Stability | External	      |
       +--------------------+-----------------+
NOTES

       Source for gzip is available in the SUNWgzipS package.

																	 GZDIFF(1)
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