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.TH TR 1 "June 13, 2021"
.SH NAME
tr \- translate characters
.SH SYNOPSIS
.nf
\fB/usr/bin/tr\fR [\fB-cds\fR] [\fIstring1\fR [\fIstring2\fR]]
.fi

.LP
.nf
\fB/usr/xpg4/bin/tr\fR [\fB-cs\fR] \fIstring1\fR \fIstring2\fR
.fi

.LP
.nf
\fB/usr/xpg4/bin/tr\fR \fB-s\fR | \fB-d\fR [\fB-c\fR] \fIstring1\fR
.fi

.LP
.nf
\fB/usr/xpg4/bin/tr\fR \fB-ds\fR [\fB-c\fR] \fIstring1\fR \fIstring2\fR
.fi

.LP
.nf
\fB/usr/xpg6/bin/tr\fR [\fB-c\fR | \fB-C\fR] [\fB-s\fR] \fIstring1\fR \fIstring2\fR
.fi

.LP
.nf
\fB/usr/xpg6/bin/tr\fR \fB-s\fR [\fB-c\fR | \fB-C\fR] \fIstring1\fR
.fi

.LP
.nf
\fB/usr/xpg6/bin/tr\fR \fB-d\fR [\fB-c\fR | \fB-C\fR] \fIstring1\fR
.fi

.LP
.nf
\fB/usr/xpg6/bin/tr\fR \fB-ds\fR [\fB-c\fR | \fB-C\fR] \fIstring1\fR \fIstring2\fR
.fi

.SH DESCRIPTION
The \fBtr\fR utility copies the standard input to the standard output with
substitution or deletion of selected characters. The options specified and the
\fIstring1\fR and \fIstring2\fR operands control translations that occur while
copying characters and single-character collating elements.
.SH OPTIONS
The following options are supported:
.sp
.ne 2
.na
\fB\fB-c\fR\fR
.ad
.RS 6n
Complements the set of values specified by \fIstring1\fR.
.RE

.sp
.ne 2
.na
\fB\fB-C\fR\fR
.ad
.RS 6n
Complements the set of characters specified by \fIstring1\fR.
.RE

.sp
.ne 2
.na
\fB\fB-d\fR\fR
.ad
.RS 6n
Deletes all occurrences of input characters that are specified by
\fIstring1\fR.
.RE

.sp
.ne 2
.na
\fB\fB-s\fR\fR
.ad
.RS 6n
Replaces instances of repeated characters with a single character.
.RE

.sp
.LP
When the \fB-d\fR option is not specified:
.RS +4
.TP
.ie t \(bu
.el o
Each input character found in the array specified by \fIstring1\fR is replaced
by the character in the same relative position in the array specified by
\fIstring2\fR. When the array specified by \fIstring2\fR is shorter than the
one specified by \fIstring1\fR, the results are unspecified.
.RE
.RS +4
.TP
.ie t \(bu
.el o
If the \fB-c\fR option is specified, the complements of the values specified by
\fIstring1\fR are placed in the array in ascending order by binary value.
.RE
.RS +4
.TP
.ie t \(bu
.el o
If the \fB-C\fR option is specified, the complements of the characters
specified by \fIstring1\fR (the set of all characters in the current character
set, as defined by the current setting of \fBLC_CTYPE\fR, except for those
actually specified in the \fIstring1\fR operand) are placed in the array in
ascending collation sequence, as defined by the current setting of
\fBLC_COLLATE\fR.
.RE
.RS +4
.TP
.ie t \(bu
.el o
Because the order in which characters specified by character class expressions
or equivalence class expressions is undefined, such expressions should only be
used if the intent is to map several characters into one. An exception is case
conversion, as described previously.
.RE
.sp
.LP
When the \fB-d\fR option is specified:
.RS +4
.TP
.ie t \(bu
.el o
Input characters found in the array specified by \fIstring1\fR are deleted.
.RE
.RS +4
.TP
.ie t \(bu
.el o
When the \fB-C\fR option is specified with \fB-d\fR, all values except those
specified by \fIstring1\fR are deleted. The contents of \fIstring2\fR are
ignored, unless the \fB-s\fR option is also specified.
.RE
.RS +4
.TP
.ie t \(bu
.el o
If the \fB-c\fR option is specified, the complements of the values specified by
\fIstring1\fR are placed in the array in ascending order by binary value.
.RE
.RS +4
.TP
.ie t \(bu
.el o
The same string cannot be used for both the \fB-d\fR and the \fB-s\fR option.
When both options are specified, both \fIstring1\fR (used for deletion) and
\fIstring2\fR (used for squeezing) are required.
.RE
.sp
.LP
When the \fB-s\fR option is specified, after any deletions or translations have
taken place, repeated sequences of the same character is replaced by one
occurrence of the same character, if the character is found in the array
specified by the last operand. If the last operand contains a character class,
such as the following example:
.sp
.in +2
.nf
\fBtr -s '[:space:]'\fR
.fi
.in -2
.sp

.sp
.LP
the last operand's array contains all of the characters in that character
class. However, in a case conversion, as described previously, such as
.sp
.in +2
.nf
\fBtr -s '[:upper:]' '[:lower:]'\fR
.fi
.in -2
.sp

.sp
.LP
the last operand's array contains only those characters defined as the second
characters in each of the \fBtoupper\fR or \fBtolower\fR character pairs, as
appropriate. (See \fBtoupper\fR(3C) and \fBtolower\fR(3C)).
.sp
.LP
An empty string used for \fIstring1\fR or \fIstring2\fR produces undefined
results.
.SH OPERANDS
The following operands are supported:
.sp
.ne 2
.na
\fB\fIstring1\fR\fR
.ad
.br
.na
\fB\fIstring2\fR\fR
.ad
.RS 11n
Translation control strings. Each string represents a set of characters to be
converted into an array of characters used for the translation.
.RE

.sp
.LP
The operands \fIstring1\fR and \fIstring2\fR (if specified) define two arrays
of characters. The constructs in the following list can be used to specify
characters or single-character collating elements. If any of the constructs
result in multi-character collating elements, \fBtr\fR excludes, without a
diagnostic, those multi-character elements from the resulting array.
.sp
.ne 2
.na
\fB\fIcharacter\fR\fR
.ad
.RS 15n
Any character not described by one of the conventions below represents itself.
.RE

.sp
.ne 2
.na
\fB\fB\e\fR\fIoctal\fR\fR
.ad
.RS 15n
Octal sequences can be used to represent characters with specific coded values.
An octal sequence consists of a backslash followed by the longest sequence of
one-, two-, or three-octal-digit characters (01234567). The sequence causes the
character whose encoding is represented by the one-, two- or three-digit octal
integer to be placed into the array. Multi-byte characters require multiple,
concatenated escape sequences of this type, including the leading \e for each
byte.
.RE

.sp
.ne 2
.na
\fB\fB\e\fR\fIcharacter\fR\fR
.ad
.RS 15n
The backslash-escape sequences \fB\ea\fR, \fB\eb\fR, \fB\ef\fR, \fB\en\fR,
\fB\er\fR, \fB\et\fR, and \fB\ev\fR are supported. The results of using any
other character, other than an octal digit, following the backslash are
unspecified.
.RE

.SS "/usr/xpg4/bin/tr"
.ne 2
.na
\fB\fIc-c\fR\fR
.ad
.RS 7n

.RE

.SS "/usr/bin/tr"
.ne 2
.na
\fB[\fIc-c\fR]\fR
.ad
.RS 13n
In the POSIX locale, this construct represents the range of collating elements
between the range endpoints (as long as neither endpoint is an octal sequence
of the form \fB\e\fR\fIoctal\fR), inclusively, as defined by the collation
sequence. The characters or collating elements in the range are placed in the
array in ascending collation sequence. If the second endpoint precedes the
starting endpoint in the collation sequence, it is unspecified whether the
range of collating elements is empty, or this construct is treated as invalid.
In locales other than the POSIX locale, this construct has unspecified
behavior.
.sp
If either or both of the range endpoints are octal sequences of the form
\fB\e\fR\fIoctal\fR, represents the range of specific coded binary values
between two range endpoints, inclusively.
.RE

.sp
.ne 2
.na
\fB\fB[:\fR\fIclass\fR\fB:]\fR\fR
.ad
.RS 13n
Represents all characters belonging to the defined character class, as defined
by the current setting of the \fBLC_CTYPE\fR locale category. The following
character class names are accepted when specified in \fIstring1\fR:
.sp
.in +2
.nf
alnum  blank  digit  lower  punct  upper
alpha  cntrl  graph  print  space  xdigit
.fi
.in -2
.sp

In addition, character class expressions of the form \fB[:\fR\fIname\fR\fB:]\fR
are recognized in those locales where the \fIname\fR keyword has been given a
\fBcharclass\fR definition in the \fBLC_CTYPE\fR category.
.sp
When both the \fB-d\fR and \fB-s\fR options are specified, any of the character
class names are accepted in \fIstring2\fR. Otherwise, only character class
names \fBlower\fR or \fBupper\fR are valid in \fIstring2\fR and then only if
the corresponding character class \fBupper\fR and \fBlower\fR, respectively, is
specified in the same relative position in \fIstring1\fR. Such a specification
is interpreted as a request for case conversion. When \fB[:lower:]\fR appears
in \fIstring1\fR and \fB[:upper:]\fR appears in \fIstring2\fR, the arrays
contain the characters from the \fBtoupper\fR mapping in the \fBLC_CTYPE\fR
category of the current locale. When \fB[:upper:]\fR appears in \fIstring1\fR
and \fB[:lower:]\fR appears in \fIstring2\fR, the arrays contain the characters
from the \fBtolower\fR mapping in the \fBLC_CTYPE\fR category of the current
locale. The first character from each mapping pair is in the array for
\fIstring1\fR and the second character from each mapping pair is in the array
for \fIstring2\fR in the same relative position.
.sp
Except for case conversion, the characters specified by a character class
expression are placed in the array in an unspecified order.
.sp
If the name specified for \fIclass\fR does not define a valid character class
in the current locale, the behavior is undefined.
.RE

.sp
.ne 2
.na
\fB\fB[=\fR\fIequiv\fR\fB=]\fR\fR
.ad
.RS 13n
Represents all characters or collating elements belonging to the same
equivalence class as \fIequiv\fR, as defined by the current setting of the
\fBLC_COLLATE\fR locale category. An equivalence class expression is allowed
only in \fIstring1\fR, or in \fIstring2\fR when it is being used by the
combined \fB-d\fR and \fB-s\fR options. The characters belonging to the
equivalence class are placed in the array in an unspecified order.
.RE

.sp
.ne 2
.na
\fB[\fIx*n\fR]\fR
.ad
.RS 13n
Represents \fIn\fR repeated occurrences of the character \fIx\fR. Because this
expression is used to map multiple characters to one, it is only valid when it
occurs in \fIstring2\fR. If \fIn\fR has a leading \fB0\fR, it is interpreted
as an octal value. Otherwise, it is interpreted as a decimal value.
.sp
If \fIn\fR is omitted or is \fB0\fR, \fB/usr/bin/tr\fR interprets this as huge;
\fB/usr/xpg4/bin/tr\fR and \fB/usr/xpg6/bin/tr\fR interprets this as large
enough to extend the \fIstring2\fR-based sequence to the length of the
\fIstring1\fR-based sequence.
.RE

.SH USAGE
See \fBlargefile\fR(7) for the description of the behavior of \fBtr\fR when
encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
.SH EXAMPLES
\fBExample 1 \fRCreating a list of words
.sp
.LP
The following example creates a list of all words in \fIfile1\fR, one per line
in \fIfile2\fR, where a word is taken to be a maximal string of letters.

.sp
.in +2
.nf
\fBtr \(mics "[:alpha:]" "[\en*]" <file1 >file2\fR
.fi
.in -2
.sp

.LP
\fBExample 2 \fRTranslating characters
.sp
.LP
This example translates all lower-case characters in \fBfile1\fR to upper-case
and writes the results to standard output.

.sp
.in +2
.nf
\fBtr "[:lower:]" "[:upper:]" <file1\fR
.fi
.in -2
.sp

.sp
.LP
Notice that the caveat expressed in the corresponding example in XPG3 is no
longer in effect. This case conversion is now a special case that employs the
\fBtolower\fR and \fBtoupper\fR classifications, ensuring that proper mapping
is accomplished (when the locale is correctly defined).

.LP
\fBExample 3 \fRIdentifying equivalent characters
.sp
.LP
This example uses an equivalence class to identify accented variants of the
base character \fBe\fR in \fBfile1\fR, which are stripped of diacritical marks
and written to \fBfile2\fR.

.sp
.in +2
.nf
\fBtr "[=e=]" e <file1 >file2\fR
.fi
.in -2
.sp

.SH ENVIRONMENT VARIABLES
See \fBenviron\fR(7) for descriptions of the following environment variables
that affect the execution of \fBtr\fR: \fBLANG\fR, \fBLC_ALL\fR,
\fBLC_COLLATE\fR, \fBLC_CTYPE\fR, \fBLC_MESSAGES\fR, and \fBNLSPATH\fR.
.SH EXIT STATUS
The following exit values are returned:
.sp
.ne 2
.na
\fB\fB0\fR\fR
.ad
.RS 6n
All input was processed successfully.
.RE

.sp
.ne 2
.na
\fB\fB>0\fR\fR
.ad
.RS 6n
An error occurred.
.RE

.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.SS "/usr/bin/tr"
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled
.TE

.SS "/usr/xpg4/bin/tr"
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled
_
Interface Stability	Committed
_
Standard	See \fBstandards\fR(7).
.TE

.SS "/usr/xpg6/bin/tr"
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled
_
Interface Stability	Committed
_
Standard	See \fBstandards\fR(7).
.TE

.SH SEE ALSO
.BR ed (1),
.BR sed (1),
.BR sh (1),
.BR tolower (3C),
.BR toupper (3C),
.BR ascii (7),
.BR attributes (7),
.BR environ (7),
.BR largefile (7),
.BR regex (7),
.BR standards (7)
.SH NOTES
Unlike some previous versions, \fB/usr/xpg4/bin/tr\fR correctly processes
\fBNUL\fR characters in its input stream. \fBNUL\fR characters can be stripped
by using \fBtr\fR \fB-d\fR \fB\&'\e000'\fR.