5 TR of the shell command

This is a wonderful command.

TR's whole spell is translate, that is, translation. Interestingly, we are able to make rules for translation. Use methods such as the following:

TR [option] set1 [Set2]

TR accepts input from standard input. The results are then printed to standard output. The main function of TR is to replace. The Set1 character set is ordered and replaced by the character set in Set2.

The following is a look at the parameters of tr.

-D Deletes the character of the Set1 specified later.

-C takes set of complement.

-S replaces the SET1 with the specified consecutive character as a set2 in the corresponding character.

TR supports some sets of similar regular expressions.

Rote memorization must not be remembered. So I can take a look at the man manual.

In all of these specific collections above. Only [: Upper:] and [: Lower:] can be replaced as many-to-many, the term is called the conversion character. Because the characters of these two sets are ordered sequentially.

The other characters can only be used for many-to-one substitution.

There is a problem, assuming that the Set1 word than characters in the Set2 character, then the Set2 inside the last character to the corresponding all the more characters.

Assuming that Set2 's character than characters in Set1, it discards more than the characters in the Set2.

See how the actual application works.

The contents of the Test.txt are as follows:

The above is a brief introduction to the TR command, the so-called practice makes perfect.

This is especially true for learning shell commands, and it's easy to remember more times.

5 TR of the shell command