An example of using tr Command in Linux system
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Name: tr
Location: / usr/bin/tr
Permissions: all users
Function: it can be used to delete the text in a message or to replace the text message.
Usage: tr [OPTION]. SET1 [SET2]
Options:
-d delete the string SET1 in the message
-s replaces the duplicate string
Example 1:
When tr does not have any parameter options, the default is to replace, which is consistent with the result of adding the-s parameter option.
The code is as follows:
$last | tr "[Amurz]"[Amurz]" | sed-n '1p'
CWJY1202 PTS/0: 0 SAT JAN 10 22:14 STILL LOGGED IN
REBOOT SYSTEM BOOT 3.2.0-24-GENERIC SAT JAN 10 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 10 14:17-19:24 (05:07)
REBOOT SYSTEM BOOT 3.2.0-24-GENERIC FRI JAN 9 20:50-22:50 (01:59)
The code is as follows:
$last | tr-s "[Amurz]"[Amurz]" | sed-n '1meme 5p'
CWJY1202 PTS/0: 0 SAT JAN 10 22:14 STIL LOGED IN
REBOT SYSTEM BOT 3.2.0-24-GENERIC SAT JAN 10 21:45-23:51 (02:05)
CWJY1202 PTS/0: 0.0 SAT JAN 10 19:24-DOWN (00:00)
REBOT SYSTEM BOT 3.2.0-24-GENERIC SAT JAN 10 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 should be enclosed in quotation marks, both single and double quotation marks
For example, the 2:tr command deletes the numbers in the output of file a (this is not to modify file a)
The code is as follows:
$cat a
Pa:11:a
Sa:32:c
App:5:b
Stort:1:d
Pear:4:aa
Hello:3:f
$cat a | tr-d "[0-9]"
Pa::a
Sa::c
App::b
Stort::d
Pear::aa
Hello::f
Note: tr-d "[0-9]" file syntax is incorrect, cannot connect files, and can receive data streams through pipeline commands, etc.
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