string conversion of Linux commands--tr

Name: TR

Location:/usr/bin/tr

Permissions: All Users

Function: can be used to delete text in a piece of information, or to replace the text information

Usage: TR [OPTION] ... SET1 [SET2]

Options:

-D Delete the SET1 string in the message

-S replaces duplicate strings

Example 1:

TR is replaced by default when there are no parameter options, consistent with the result of the-s parameter option.

$ last| TR  "[A-Z]" "[A-z]" |sed-n ' 1,5p ' CWJY1202 pts/0        : 0               SAT JAN 22:14 still   logged in REBOOT   SYSTEM BOOT  3.2.0-24-generic Sat Jan 21:45-23:48  (02:03)    CWJY1202 pts/0        : 0.0             Sat Jan 10 19:24 -Down   (00:00)    REBOOT   SYSTEM BOOT  3.2.0-24-generic SAT JAN 14:17-19:24  (05:07)    REBOOT   SYSTEM BOOT  3.2.0-24-generic FRI JAN  9 20:50-22:50  

$ last| Tr-s  "[A-Z]" "[A-z]" |sed-n ' 1,5p ' CWJY1202 pts/0        : 0               SAT JAN 22:14 STIL loged in   rebot   SYSTEM BOT  3.2.0-24-generic Sat Jan 21:45-23:51  (02:05)    CWJY1202 pts/0        : 0.0             Sat Jan 19:24-DOWN
    (00:00)    rebot   SYSTEM BOT  3.2.0-24-generic SAT JAN 14:17-19:24  (05:07)    Rebot   SYSTEM BOT  3.2.0-24-generic FRI JAN  9 20:50-22:50  (01:59)

Note: SET1 and SET2 are quoted, and both single and double quotation marks can be

Example 2:The TR command deletes the number in the A file output (this is not a modified file a)

$ cat apa:11:asa:32:capp:5:bstort:1:dpear:4:aahello:3:f$ Cat a| Tr-d "[0-9]" Pa::asa::capp::bstort::d pear::aahello::f

Note: tr-d "[0-9]" file syntax is incorrect and cannot be used to receive data streams through pipeline commands, etc.

Cond......

string conversion of Linux commands--tr