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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 )
  •  

    NAME

    cat - concatenate and display files
     
    

    SYNOPSIS

     

    /usr/bin/cat

    /usr/bin/cat [-nbsuvet] [file...]
    

     

    ksh93

    cat [-bdenstuvABDEST] [file...]
    

     

    DESCRIPTION

     

    /usr/bin/cat

    The cat utility reads each file in sequence and writes it on the standard output. Thus:

    example% cat file
    

    prints file on your terminal, and:

    example% cat file1 file2 >file3
    

    concatenates file1 and file2, and writes the results in file3. If no input file is given, cat reads from the standard input file.  

    ksh93

    The cat built-in in ksh93 is associated with the /bin and /usr/bin paths. It is invoked when cat is executed without a pathname prefix and the pathname search finds a /bin/cat or /usr/bin/cat executable. cat copies each file in sequence to the standard output. If no file is specified, or if the file is -, cat copies from standard input starting at the current location.  

    OPTIONS

     

    /usr/bin/cat

    The following options are supported by /usr/bin/cat:

    -b

    Number the lines, as -n, but omit the line numbers from blank lines.

    -n

    Precede each line output with its line number.

    -s

    cat is silent about non-existent files.

    -u

    The output is not buffered.

    Buffered output is the default.

    -v

    Non-printing characters, with the exception of tabs, NEWLINEs and form feeds, are printed visibly. ASCII control characters (octal 000 - 037) are printed as ^n, where n is the corresponding ASCII character in the range octal 100 - 137 (@, A, B, C, . . ., X, Y, Z, [, \, ], ^, and _); the DEL character (octal 0177) is printed ^?. Other non-printable characters are printed as M-x, where x is the ASCII character specified by the low-order seven bits.

    When used with the -v option, the following options can be used:

    -e

    A $ character is printed at the end of each line, prior to the NEWLINE.

    -t

    Tabs are printed as ^Is and form feeds to be printed as ^Ls.

    The -e and -t options are ignored if the -v option is not specified.  

    ksh93

    ksh93 cat supports the following options:

    -b --number-nonblank

    Number lines as with -n but omit line numbers from blank lines.

    -d --dos-input

    Open input files in text mode. Removes RETURNs in front of NEWLINEs on some systems.

    -e

    Equivalent to -vE.

    -n --number

    Insert a line number at the beginning of each line.

    -s

    Equivalent to -S for att universe and -B otherwise.

    -t

    Equivalent to -vT.

    -u --unbuffer

    Do not delay the output by buffering.

    -v --show-nonprinting

    Cause non-printing characters (with the exception of TABs, NEWLINEs, and form feeds) to be output as printable character sequences. ASCII control characters are printed as ^n, where n is the corresponding ASCII character in the range octal 100-137. The DEL character (octal 0177) is copied as ^?. Other non-printable characters are copied as M-x where x is the ASCII character specified by the low-order seven bits. Multi-byte characters in the current locale are treated as printable characters.

    -A --show-all

    Equivalent to -vET.

    -B --squeeze-blank

    Replace multiple adjacent NEWLINE characters with one NEWLINE.

    -D --dos-output

    Open output files in text mode. Insert RETURNs in front of NEWLINEs on some systems.

    -E --show-ends

    Insert a $ before each NEWLINE.

    -S --silent

    cat is silent about non-existent files.

    -T --show-blank

    Copies TABs as ^I and form feeds as ^L.

     

    OPERANDS

    The following operand is supported:

    file

    A path name of an input file. If no file is specified, the standard input is used. If file is -, cat reads from the standard input at that point in the sequence. cat does not close and reopen standard input when it is referenced in this way, but accepts multiple occurrences of - as file.

     

    USAGE

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

    EXAMPLES

    Example 1 Concatenating a File

    The following command writes the contents of the file myfile to standard output:

    example% cat myfile
    

    Example 2 Concatenating Two files into One

    The following command concatenates the files doc1 and doc2 and writes the result to doc.all.

    example% cat doc1 doc2 > doc.all
    

    Example 3 Concatenating Two Arbitrary Pieces of Input with a Single Invocation

    When standard input is a terminal, the following command gets two arbitrary pieces of input from the terminal with a single invocation of cat:

    example% cat start - middle - end > file
    

    when standard input is a terminal, gets two arbitrary pieces of input from the terminal with a single invocation of cat.

    If standard input is a regular file,

    example% cat start - middle - end > file
    

    would be equivalent to the following command:

    cat start - middle /dev/null end > file
    

    because the entire contents of the file would be consumed by cat the first time - was used as a file operand and an end-of-file condition would be detected immediately when -was referenced the second time.

     

    ENVIRONMENT VARIABLES

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

    EXIT STATUS

    The following exit values are returned:

    0

    All input files were output successfully.

    >0

    An error occurred.

     

    ATTRIBUTES

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

    /usr/bin/cat

    ATTRIBUTE TYPEATTRIBUTE VALUE

    AvailabilitySUNWcsu

    CSI

    Interface Stability

    Standard

     

    ksh93

    ATTRIBUTE TYPEATTRIBUTE VALUE

    AvailabilitySUNWcsu

    Interface Stability

    The ksh93 built-in binding to /bin and /usr/bin is Volatile. The built-in interfaces are Uncommitted.  

    SEE ALSO

    touch(1), attributes(5), environ(5), largefile(5), standards(5)  

    NOTES

    Redirecting the output of cat onto one of the files being read causes the loss of the data originally in the file being read. For example,

    example% cat filename1 filename2 > filename1
    

    causes the original data in filename1 to be lost.


     

    Index

    NAME
    SYNOPSIS
    /usr/bin/cat
    ksh93
    DESCRIPTION
    /usr/bin/cat
    ksh93
    OPTIONS
    /usr/bin/cat
    ksh93
    OPERANDS
    USAGE
    EXAMPLES
    ENVIRONMENT VARIABLES
    EXIT STATUS
    ATTRIBUTES
    /usr/bin/cat
    ksh93
    SEE ALSO
    NOTES


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