Name
tr
Synopsis
tr [options] [string1 [string2]]
Description
Translate characters—copy standard input to standard output, substituting characters from string1 to string2 or deleting characters in string1.
Options
- -c, --complement
Complement characters in string1 with respect to ASCII 001-377.
- -d, --delete
Delete characters in string1 from output.
- -s, --squeeze-repeats
Squeeze out repeated output characters in string2.
- -t, --truncate-set1
Truncate string1 to the length of string2 before translating.
- --help
Print help message and then exit.
- --version
Print the version number and then exit.
Special characters
Include brackets ([]) where shown.
- \a
^G (bell)
- \b
^H (backspace)
- \f
^L (form feed)
- \n
^J (newline)
- \r
^M (carriage return)
- \t
^I (tab)
- \v
^K (vertical tab)
- \ nnn
Character with octal value nnn.
- \\
Literal backslash.
- char1-char2
All characters in the range char1 through char2. If char1 does not sort before char2, produce an error.
- [char1-char2]
Same as char1-char2 if both strings use this.
- [char*]
In string2, expand char to the length of string1.
- [char*number]
Expand char to number occurrences. [x*4] expands to xxxx, for instance.
- [:class:]
Expand to all characters in class, where class can be:
- alnum
Letters and digits
- alpha
Letters
- blank
Whitespace
- cntrl
Control characters
- digit
Digits
- graph
Printable characters except space
- lower
Lowercase letters
Printable characters
- punct
Punctuation
- space
Whitespace (horizontal or vertical)
- upper
Uppercase letters
- xdigit
Hexadecimal digits
- [=
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