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NAME    [Toc]    [Back]

       cmp - Compares two files

SYNOPSIS    [Toc]    [Back]

       cmp [-l  | -s] file1 file2

STANDARDS    [Toc]    [Back]

       Interfaces  documented  on  this reference page conform to
       industry standards as follows:


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

OPTIONS    [Toc]    [Back]

       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.

OPERANDS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

       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
 subsequence 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

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

EXIT STATUS    [Toc]    [Back]

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

EXAMPLES    [Toc]    [Back]

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

              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 prog.o

              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: Provides 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  variables  contain
 an invalid setting, the utility behaves as if none of
       the variables had been defined.  If  set  to  a  non-empty
       string value, overrides 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  multibyte
       characters  in  arguments).  Determines the locale for the
       format and contents  of  diagnostic  messages  written  to
       standard  error.  Determines the location of message catalogues
 for the processing of LC_MESSAGES.

SEE ALSO    [Toc]    [Back]

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

       Standards:  standards(5)

[ Back ]
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