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Интерактивная система просмотра системных руководств (man-ов)

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cat (1)
  • cat (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • >> cat (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • cat (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • cat (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • cat (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
  • cat (8) ( Русские man: Команды системного администрирования )

  • BSD mandoc
     

    NAME

    
    
    cat
    
     - concatenate and print files
    
     
    

    SYNOPSIS

    [-benstuv ] [file ... ]  

    DESCRIPTION

    The utility reads files sequentially, writing them to the standard output. The file operands are processed in command-line order. If file is a single dash (`- ' ) or absent, reads from the standard input. If file is a UNIX domain socket, connects to it and then reads it until EOF This complements the UNIX domain binding capability available in inetd(8).

    The options are as follows:

    -b
    Number the non-blank output lines, starting at 1.
    -e
    Display non-printing characters (see the -v option), and display a dollar sign (`$' ) at the end of each line.
    -n
    Number the output lines, starting at 1.
    -s
    Squeeze multiple adjacent empty lines, causing the output to be single spaced.
    -t
    Display non-printing characters (see the -v option), and display tab characters as `^I'
    -u
    Disable output buffering.
    -v
    Display non-printing characters so they are visible. Control characters print as `^X' for control-X; the delete character (octal 0177) prints as `^?' Non- ASCII characters (with the high bit set) are printed as `M-' (for meta) followed by the character for the low 7 bits.

     

    EXIT STATUS

    Ex -std  

    EXAMPLES

    The command:

    "cat file1"

    will print the contents of file1 to the standard output.

    The command:

    "cat file1 file2 > file3"

    will sequentially print the contents of file1 and file2 to the file file3 truncating file3 if it already exists. See the manual page for your shell (i.e., sh(1)) for more information on redirection.

    The command:

    "cat file1 - file2 - file3"

    will print the contents of file1 print data it receives from the standard input until it receives an EOF (`^D' ) character, print the contents of file2 read and output contents of the standard input again, then finally output the contents of file3 Note that if the standard input referred to a file, the second dash on the command-line would have no effect, since the entire contents of the file would have already been read and printed by when it encountered the first `- ' operand.  

    SEE ALSO

    head(1), more(1), pr(1), sh(1), tail(1), vis(1), zcat(1), setbuf(3)
    Rob Pike "UNIX Style, or cat -v Considered Harmful" "USENIX Summer Conference Proceedings" 1983
     

    STANDARDS

    The utility is compliant with the St -p1003.2-92 specification.

    The flags [-benstv ] are extensions to the specification.  

    HISTORY

    A utility appeared in AT&T System v1 . An Dennis Ritchie designed and wrote the first man page. It appears to have been cat(1).  

    BUGS

    Because of the shell language mechanism used to perform output redirection, the command ``cat file1 file2 > file1 '' will cause the original data in file1 to be destroyed!

    The utility does not recognize multibyte characters when the -t or -v option is in effect.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    EXIT STATUS
    EXAMPLES
    SEE ALSO
    STANDARDS
    HISTORY
    BUGS


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