The TR, tee of the Linux command

TR Replace or delete characters

-D Delete Character
-C uses a complement of the first character set, which is the inverse
-S retains the first character of a continuous character, removing other characters

View Test Files Tr.txt
[email protected] tmp]# cat Tr.txt
ABC Oldboy FFF
Erhait
Dfab DD ACR

Example:

1 The ABC in the file is converted to XYZ
[[Email protected] tmp]# TR ' abc ' XYZ ' <tr.txt
XYZ Oldyoy FFF
Erhait
DFXY DD XZR
The ABC and XYZ one by one are replaced, and are global replacements.

2 Replace lowercase letters with uppercase
[[Email protected] tmp]# TR ' [A-z] ' [A-z] ' <tr.txt
ABC Oldboy FFF
Erhait
Dfab DD ACR

3 Delete Oldboy

[Email protected] tmp]# tr-d Oldboy <tr.txt
AC FFF
Erhait
FA ACR

Delete all the Oldboy, including the 6 letters

4 Replace all lowercase letters with * #和所有非小写字母的字符替换为 #
[[Email protected] tmp]# TR ' [A-z] ' # ' <tr.txt

Erhait

[[email protected] tmp]# tr-c ' [A-z] ' # ' <tr.txt
abc#oldboy#fff####### #dfab #dd#acr#[[email protected] tmp]#

Tee Multi-directional, output to the screen at the same time, output to a file

-A Append

Example

[Email protected] tmp]# echo 123|tee-a tr.txt
123
[email protected] tmp]# cat Tr.txt
ABC Oldboy FFF
Erhait
Dfab DD ACR
123

The TR, tee of the Linux command