tr 文字列の置き換え、削除

文字列の置き換え、削除

```[linuxstudy@xxxx ~]$ tr ab cd   //a->b, c->d
abcd
cdcd
[linuxstudy@xxxx ~]$ tr -d ab     //delete a,b
abcd
cd
[linuxstudy@xxxx ~]$ tr -s a     //aaa....->a
aaabbbccc
abbbccc
```
```
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, writ‐
       ing 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 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 them‐
       selves.  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.

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

AUTHOR
       Written by Jim Meyering.

COPYRIGHT
       Copyright © 2013 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
       The full documentation for tr is maintained as a  Texinfo  manual.   If
       the  info and tr programs are properly installed at your site, the com‐
       mand

              info coreutils 'tr invocation'

       should give you access to the complete manual.



GNU coreutils 8.22               November 2020                           TR(1)
```