cmp man page on DigitalUNIX

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cmp(1)									cmp(1)

       cmp - Compares two files

       cmp [-l	| -s] file1 file2

       Interfaces  documented on this reference page conform to industry stan‐
       dards as follows:


       Refer to the standards(5) reference page	 for  more  information	 about
       industry standards and associated tags.

       Prints  the  byte  number (decimal) and the differing bytes (octal) for
       each difference.	 Does not print data for differing files; returns only
       an exit value.

       The  path name of a file to be compared.	 The path name of a file to be

       The cmp command compares two files.

       If file1 or file2 is - (dash), standard input is used  for  that	 file.
       It is an error to specify - for both files.

       By  default, the cmp command prints no information if the files are the
       same.  If the files differ, cmp prints the byte and line	 number	 where
       the difference occurred.

       The  cmp	 command  also specifies whether one file is an initial subse‐
       quence of the other (that is, if the cmp command reads  an  End-of-File
       character  in  one  file before finding any differences).  Usually, you
       use the cmp command to compare nontext files and the  diff  command  to
       compare text files.

       Note that bytes and lines reported by cmp are numbered from 1.

       The  following  exit values are returned: The files are identical.  The
       files differ.  This includes files of different lengths that are	 iden‐
       tical in the first part of both files.  An error occurred.

       To  determine  whether  two  files are identical, enter: cmp prog.o.bak

	      The preceding command compares the files prog.o.bak and  prog.o.
	      If  the  files are identical, a message is not displayed. If the
	      files differ, the location of the first difference is displayed.
	      For instance: prog.o.bak prog.o differ:  byte 5, line 1

	      If  the  message	cmp:  EOF on prog.o.bak is displayed, then the
	      first part of prog.o is identical to prog.o.bak,	but  there  is
	      additional data in prog.o.

	      If the message cmp: EOF on prog.o is displayed, it is prog.o.bak
	      that is the same as prog.o but also contains addition data.   To
	      display each pair of bytes that differ, enter: cmp -l prog.o.bak

	      This compares the files and then displays the  byte  number  (in
	      decimal) and the differing bytes (in octal) for each difference.
	      For example, if the fifth byte is octal 101  in  prog.o.bak  and
	      141 in prog.o, then the cmp command displays: 5 101 141

       The  following  environment variables affect the execution of cmp: Pro‐
       vides a default value for the internationalization variables  that  are
       unset  or  null. If LANG is unset or null, the corresponding value from
       the default locale is used.  If any of the  internationalization	 vari‐
       ables contain an invalid setting, the utility behaves as if none of the
       variables had been defined.  If set to a non-empty string value,	 over‐
       rides  the  values  of  all  the	 other internationalization variables.
       Determines the locale for the interpretation of sequences of  bytes  of
       text  data as characters (for example, single-byte as opposed to multi‐
       byte characters in arguments).  Determines the locale  for  the	format
       and  contents of diagnostic messages written to standard error.	Deter‐
       mines the location of message catalogues for the processing of  LC_MES‐

       Commands:  comm(1), bdiff(1), diff(1), diff3(1), sdiff(1)

       Standards:  standards(5)


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