Delete not readable characters Post: 302267328

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tr

TR(1)								   User Commands							     TR(1)

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
	      use the complement of SET1

       -d, --delete
	      delete characters in SET1, do not translate

       -s, --squeeze-repeats
	      replace each sequence of a repeated character that is listed in the last specified SET, 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

            backspace

       f     form feed

       
     new line

       
     return

       	     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 the last
       specified SET, and occurs after translation or deletion.

AUTHOR

       Written by Jim Meyering.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report tr translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/tr>
       or available locally via: info '(coreutils) tr invocation'

GNU coreutils 8.28						   January 2018 							     TR(1)