303 lines
8.7 KiB
Groff
303 lines
8.7 KiB
Groff
.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)tr.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd October 11, 1997
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.Dt TR 1
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.Os
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.Sh NAME
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.Nm tr
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.Nd translate characters
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.Sh SYNOPSIS
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.Nm
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.Op Fl csu
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.Ar string1 string2
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.Nm
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.Op Fl cu
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.Fl d
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.Ar string1
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.Nm
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.Op Fl cu
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.Fl s
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.Ar string1
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.Nm
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.Op Fl cu
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.Fl ds
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.Ar string1 string2
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.Sh DESCRIPTION
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The
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.Nm
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utility copies the standard input to the standard output with substitution
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or deletion of selected characters.
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.Pp
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The following options are available:
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.Bl -tag -width Ds
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.It Fl c
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Complements the set of characters in
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.Ar string1 ,
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that is ``-c ab'' includes every character except for ``a'' and ``b''.
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.It Fl d
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The
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.Fl d
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option causes characters to be deleted from the input.
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.It Fl s
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The
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.Fl s
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option squeezes multiple occurrences of the characters listed in the last
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operand (either
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.Ar string1
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or
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.Ar string2 )
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in the input into a single instance of the character.
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This occurs after all deletion and translation is completed.
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.It Fl u
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The
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.Fl u
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option guarantees that any output is unbuffered.
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.El
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.Pp
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In the first synopsis form, the characters in
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.Ar string1
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are translated into the characters in
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.Ar string2
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where the first character in
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.Ar string1
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is translated into the first character in
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.Ar string2
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and so on.
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If
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.Ar string1
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is longer than
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.Ar string2 ,
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the last character found in
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.Ar string2
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is duplicated until
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.Ar string1
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is exhausted.
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.Pp
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In the second synopsis form, the characters in
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.Ar string1
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are deleted from the input.
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.Pp
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In the third synopsis form, the characters in
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.Ar string1
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are compressed as described for the
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.Fl s
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option.
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.Pp
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In the fourth synopsis form, the characters in
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.Ar string1
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are deleted from the input, and the characters in
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.Ar string2
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are compressed as described for the
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.Fl s
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option.
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.Pp
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The following conventions can be used in
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.Ar string1
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and
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.Ar string2
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to specify sets of characters:
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.Bl -tag -width [:equiv:]
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.It character
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Any character not described by one of the following conventions
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represents itself.
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.It \eoctal
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A backslash followed by 1, 2 or 3 octal digits represents a character
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with that encoded value.
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To follow an octal sequence with a digit as a character, left zero-pad
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the octal sequence to the full 3 octal digits.
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.It \echaracter
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A backslash followed by certain special characters maps to special
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values.
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.Pp
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.Bl -column "\ea"
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.It "\ea <alert character>
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.It "\eb <backspace>
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.It "\ef <form-feed>
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.It "\en <newline>
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.It "\er <carriage return>
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.It "\et <tab>
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.It "\ev <vertical tab>
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.El
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.Pp
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A backslash followed by any other character maps to that character.
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.It c-c
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Represents the range of characters between the range endpoints, inclusively.
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.It [:class:]
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Represents all characters belonging to the defined character class.
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Class names are:
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.Pp
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.Bl -column "xdigit"
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.It "alnum <alphanumeric characters>
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.It "alpha <alphabetic characters>
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.It "cntrl <control characters>
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.It "digit <numeric characters>
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.It "graph <graphic characters>
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.It "lower <lower-case alphabetic characters>
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.It "print <printable characters>
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.It "punct <punctuation characters>
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.It "space <space characters>
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.It "upper <upper-case characters>
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.It "xdigit <hexadecimal characters>
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.El
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.Pp
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.\" All classes may be used in
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.\" .Ar string1 ,
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.\" and in
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.\" .Ar string2
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.\" when both the
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.\" .Fl d
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.\" and
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.\" .Fl s
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.\" options are specified.
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.\" Otherwise, only the classes ``upper'' and ``lower'' may be used in
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.\" .Ar string2
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.\" and then only when the corresponding class (``upper'' for ``lower''
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.\" and vice-versa) is specified in the same relative position in
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.\" .Ar string1 .
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.\" .Pp
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With the exception of the ``upper'' and ``lower'' classes, characters
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in the classes are in unspecified order.
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In the ``upper'' and ``lower'' classes, characters are entered in
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ascending order.
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.Pp
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For specific information as to which ASCII characters are included
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in these classes, see
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.Xr ctype 3
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and related manual pages.
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.It [=equiv=]
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Represents all characters or collating (sorting) elements belonging to
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the same equivalence class as
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.Ar equiv .
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If
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there is a secondary ordering within the equivalence class, the characters
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are ordered in ascending sequence.
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Otherwise, they are ordered after their encoded values.
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An example of an equivalence class might be ``c'' and ``ch'' in Spanish;
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English has no equivalence classes.
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.It [#*n]
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Represents
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.Ar n
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repeated occurrences of the character represented by
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.Ar # .
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This
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expression is only valid when it occurs in
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.Ar string2 .
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If
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.Ar n
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is omitted or is zero, it is be interpreted as large enough to extend
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.Ar string2
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sequence to the length of
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.Ar string1 .
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If
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.Ar n
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has a leading zero, it is interpreted as an octal value, otherwise,
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it's interpreted as a decimal value.
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.El
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.Sh DIAGNOSTICS
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The
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.Nm
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utility exits 0 on success, and >0 if an error occurs.
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.Sh EXAMPLES
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The following examples are shown as given to the shell:
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.Pp
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Create a list of the words in file1, one per line, where a word is taken to
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be a maximal string of letters.
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.Pp
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.D1 Li "tr -cs \*q[:alpha:]\*q \*q\en\*q < file1"
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.Pp
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Translate the contents of file1 to upper-case.
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.Pp
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.D1 Li "tr \*q[:lower:]\*q \*q[:upper:]\*q < file1"
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.Pp
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Strip out non-printable characters from file1.
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.Pp
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.D1 Li "tr -cd \*q[:print:]\*q < file1"
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.Sh COMPATIBILITY
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System V has historically implemented character ranges using the syntax
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``[c-c]'' instead of the ``c-c'' used by historic BSD implementations and
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standardized by POSIX.
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System V shell scripts should work under this implementation as long as
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the range is intended to map in another range, i.e. the command
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``tr [a-z] [A-Z]'' will work as it will map the ``['' character in
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.Ar string1
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to the ``['' character in
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.Ar string2 .
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However, if the shell script is deleting or squeezing characters as in
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the command ``tr -d [a-z]'', the characters ``['' and ``]'' will be
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included in the deletion or compression list which would not have happened
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under an historic System V implementation.
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Additionally, any scripts that depended on the sequence ``a-z'' to
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represent the three characters ``a'', ``-'' and ``z'' will have to be
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rewritten as ``a\e-z''.
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.Pp
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The
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.Nm
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utility has historically not permitted the manipulation of NUL bytes in
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its input and, additionally, stripped NUL's from its input stream.
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This implementation has removed this behavior as a bug.
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.Pp
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The
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.Nm
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utility has historically been extremely forgiving of syntax errors,
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for example, the
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.Fl c
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and
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.Fl s
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options were ignored unless two strings were specified.
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This implementation will not permit illegal syntax.
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.Sh STANDARDS
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The
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.Nm
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utility is expected to be
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.St -p1003.2
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compatible.
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It should be noted that the feature wherein the last character of
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.Ar string2
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is duplicated if
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.Ar string2
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has less characters than
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.Ar string1
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is permitted by POSIX but is not required.
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Shell scripts attempting to be portable to other POSIX systems should use
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the ``[#*]'' convention instead of relying on this behavior.
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The
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.Fl u
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option is an extension to the
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.St -p1003.2
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standard.
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