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cmp (1)
  • >> cmp (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • cmp (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • cmp (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • cmp (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
  •  

    NAME

    cmp - compare two files
     
    

    SYNOPSIS

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

     

    DESCRIPTION

    The cmp utility compares two files. cmp writes no output if the files are the same. Under default options, if they differ, it writes to standard output the byte and line numbers at which the first difference occurred. Bytes and lines are numbered beginning with 1. If one file is an initial subsequence of the other, that fact is noted. skip1 and skip2 are initial byte offsets into file1 and file2 respectively, and can be either octal or decimal. A leading 0 denotes octal.  

    OPTIONS

    The following options are supported:

    -l

    Write the byte number (decimal) and the differing bytes (octal) for each difference.

    -s

    Write nothing for differing files. Return exit status only.

     

    OPERANDS

    The following operands are supported:

    file1

    A path name of the first file to be compared. If file1 is -, the standard input is used.

    file2

    A path name of the second file to be compared. If file2 is -, the standard input is used.

    If both file1 and file2 refer to standard input or refer to the same FIFO special, block special or character special file, an error results.  

    USAGE

    See largefile(5) for the description of the behavior of cmp when encountering files greater than or equal to 2 Gbyte (2^31 bytes).  

    EXAMPLES

    Example 1 Comparing Files Byte for Byte

    The following example does a byte for byte comparison of file1 and file2:

    example% cmp file1 file2 0 1024
    

    It skips the first 1024 bytes in file2 before starting the comparison.

     

    ENVIRONMENT VARIABLES

    See environ(5) for descriptions of the following environment variables that affect the execution of cmp: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.  

    EXIT STATUS

    The following error values are returned:

    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.

    >1

    An error occurred.

     

    ATTRIBUTES

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

    ATTRIBUTE TYPEATTRIBUTE VALUE

    AvailabilitySUNWcsu

    CSI

    Interface Stability

     

    SEE ALSO

    comm(1), diff(1), attributes(5), environ(5), largefile(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    OPTIONS
    OPERANDS
    USAGE
    EXAMPLES
    ENVIRONMENT VARIABLES
    EXIT STATUS
    ATTRIBUTES
    SEE ALSO


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