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Annotation of cci/usr/src/man/man1/dd.1, revision 1.1

1.1     ! root        1: .TH DD 1  "18 January 1983"
        !             2: .UC 4
        !             3: .SH NAME
        !             4: dd \- convert and copy a file
        !             5: .SH SYNOPSIS
        !             6: .B dd
        !             7: [option=value] ...
        !             8: .SH DESCRIPTION
        !             9: .I Dd
        !            10: copies the specified input file
        !            11: to the specified output with
        !            12: possible conversions.
        !            13: The standard input and output are used by default.
        !            14: The input and output block size may be
        !            15: specified to take advantage of raw physical I/O.
        !            16: .PP
        !            17: .br
        !            18: .ns
        !            19: .TP 15
        !            20: .I option
        !            21: .I values
        !            22: .br
        !            23: .ns
        !            24: .TP 
        !            25: if=
        !            26: input file name; standard input is default
        !            27: .br
        !            28: .ns
        !            29: .TP 
        !            30: of=
        !            31: output file name; standard output is default
        !            32: .br
        !            33: .ns
        !            34: .TP 
        !            35: .RI ibs= n
        !            36: input block size
        !            37: .I n
        !            38: bytes (default 512)
        !            39: .br
        !            40: .ns
        !            41: .TP 
        !            42: .RI obs= n
        !            43: output block size (default 512)
        !            44: .br
        !            45: .ns
        !            46: .TP 
        !            47: .RI bs= n
        !            48: set both input and output block size,
        !            49: superseding
        !            50: .I ibs
        !            51: and
        !            52: .I obs;
        !            53: also, if no conversion is specified,
        !            54: it is particularly efficient since no copy need be done
        !            55: .br
        !            56: .ns
        !            57: .TP 
        !            58: .RI cbs= n
        !            59: conversion buffer size
        !            60: .br
        !            61: .ns
        !            62: .TP 
        !            63: .RI skip= n
        !            64: skip
        !            65: .IR n ""
        !            66: input records before starting copy
        !            67: .br
        !            68: .ns
        !            69: .TP
        !            70: .RI files= n
        !            71: copy
        !            72: .I n
        !            73: input files before terminating (makes sense only
        !            74: where input is a magtape or similar device).
        !            75: .br
        !            76: .ns
        !            77: .TP 
        !            78: .RI seek= n
        !            79: seek
        !            80: .I n
        !            81: records from beginning of output file before copying
        !            82: .br
        !            83: .ns
        !            84: .TP 
        !            85: count=\fIn\fR
        !            86: copy only
        !            87: .IR n ""
        !            88: input records
        !            89: .br
        !            90: .ns
        !            91: .TP 
        !            92: conv=ascii
        !            93: .ds h \h'\w'conv='u'
        !            94: convert EBCDIC to ASCII
        !            95: .br
        !            96: .ns
        !            97: .IP \*hebcdic
        !            98: convert ASCII to EBCDIC
        !            99: .br
        !           100: .ns
        !           101: .IP \*hibm
        !           102: slightly different map of ASCII to EBCDIC
        !           103: .br
        !           104: .ns
        !           105: .IP \*hblock
        !           106: convert variable length records to fixed length
        !           107: .br
        !           108: .ns
        !           109: .IP \*hunblock
        !           110: convert fixed length records to variable length
        !           111: .br
        !           112: .ns
        !           113: .IP \*hlcase
        !           114: map alphabetics to lower case
        !           115: .br
        !           116: .ns
        !           117: .IP \*hucase
        !           118: map alphabetics to upper case
        !           119: .br
        !           120: .ns
        !           121: .IP \*hswab
        !           122: swap every pair of bytes
        !           123: .br
        !           124: .ns
        !           125: .IP \*hnoerror
        !           126: do not stop processing on an error
        !           127: .br
        !           128: .ns
        !           129: .IP \*hsync
        !           130: pad every input record to
        !           131: .I  ibs
        !           132: .br
        !           133: .ns
        !           134: .IP "\*h... , ..."
        !           135: several comma-separated conversions
        !           136: .PP
        !           137: .fi
        !           138: Where sizes are specified,
        !           139: a number of bytes is expected.
        !           140: A number may end with
        !           141: .B "k, b"
        !           142: or
        !           143: .B w
        !           144: to specify multiplication by
        !           145: 1024, 512, or 2 respectively;
        !           146: a pair of numbers may be separated by
        !           147: .B x
        !           148: to indicate a product.  The maximum 
        !           149: limit for the block size is 32k.
        !           150: .PP
        !           151: .I Cbs
        !           152: is used only if
        !           153: .I ascii,
        !           154: .I unblock,
        !           155: .I ebcdic,
        !           156: .I ibm,
        !           157: or
        !           158: .I block
        !           159: conversion is specified.
        !           160: In the first two cases,
        !           161: .I cbs
        !           162: characters are placed into the conversion buffer, any specified
        !           163: character mapping is done,
        !           164: trailing blanks trimmed and new-line added
        !           165: before sending the line to the output.
        !           166: In the latter three cases, characters are read into the
        !           167: conversion buffer, and blanks added
        !           168: to make up an
        !           169: output record of size
        !           170: .IR cbs .
        !           171: .PP
        !           172: After completion,
        !           173: .I dd
        !           174: reports the number of whole and partial input and output
        !           175: blocks.
        !           176: .PP
        !           177: For example, to read an EBCDIC tape blocked ten 80-byte
        !           178: EBCDIC card images per record into the ASCII file
        !           179: .I x:
        !           180: .IP
        !           181: .nf
        !           182: dd if=/dev/rmt0 of=x ibs=800 cbs=80 conv=ascii,lcase
        !           183: .fi
        !           184: .PP
        !           185: Note the use of raw magtape.
        !           186: .I Dd
        !           187: is especially suited to I/O on the raw
        !           188: physical devices because it allows reading
        !           189: and writing in arbitrary record sizes.
        !           190: .SH "SEE ALSO"
        !           191: cp(1), tr(1)
        !           192: .SH DIAGNOSTICS
        !           193: f+p records in(out): numbers of full and partial records read(written)
        !           194: .SH BUGS
        !           195: The ASCII/EBCDIC conversion tables are
        !           196: taken
        !           197: from the 256 character standard in
        !           198: the CACM Nov, 1968.
        !           199: The `ibm' conversion, while less blessed as a standard,
        !           200: corresponds better to certain IBM print train conventions.
        !           201: There is no universal solution.
        !           202: .br
        !           203: One must specify ``conv=noerror,sync'' when copying
        !           204: raw disks with bad sectors to insure 
        !           205: .I dd
        !           206: stays synchronized.

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