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man page(1) manual page Table of Contents

Name

tr - translate or delete characters

Synopsis

tr [OPTION]... SET1 [SET2]

Description

Translate, squeeze, and/or delete characters from standard input, writing to standard output.

-c, -C, --complement: first complement SET1
-d, --delete: delete characters in SET1, do not translate
-s, --squeeze-repeats: replace each input sequence of a repeated character that is listed in SET1 with a single occurrence of that character
-t, --truncate-set1: first truncate SET1 to length of SET2
--help display this help and exit
--version: output version information and exit

SETs are specified as strings of characters. Most represent themselves. Interpreted sequences are:

\NNN: character with octal value NNN (1 to 3 octal digits)
\\: backslash
\a: audible BEL
\b: backspace
\f: form feed
\n: new line
\r: return
\t: horizontal tab
\v: vertical tab
CHAR1-CHAR2: all characters from CHAR1 to CHAR2 in ascending order
[CHAR*]: in SET2, copies of CHAR until length of SET1
[CHAR*REPEAT]: REPEAT copies of CHAR, REPEAT octal if starting with 0

[:alnum:]
all letters and digits

[:alpha:]
all letters

[:blank:]
all horizontal whitespace

[:cntrl:]
all control characters

[:digit:]
all digits

[:graph:]
all printable characters, not including space

[:lower:]
all lower case letters

[:print:]
all printable characters, including space

[:punct:]
all punctuation characters

[:space:]
all horizontal or vertical whitespace

[:upper:]
all upper case letters

[:xdigit:]
all hexadecimal digits

[=CHAR=]: all characters which are equivalent to CHAR

Translation occurs if -d is not given and both SET1 and SET2 appear. -t may be used only when translating. SET2 is extended to length of SET1 by repeating its last character as necessary. Excess characters of SET2 are ignored. Only [:lower:] and [:upper:] are guaranteed to expand in ascending order; used in SET2 while translating, they may only be used in pairs to specify case conversion. -s uses SET1 if not translating nor deleting; else squeezing uses SET2 and occurs after translation or deletion.

LinuxGuide.it > Linux Man Page: "tr"

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