Character-based translation using tr
Another interesting shell command is tr. This translates, squeezes, or deletes characters from the standard input. The syntax will be as follows:
tr [OPTION]... SET1 [SET2]
The options for the tr commands are explained in the following table:
|
Option |
Description |
|---|---|
|
|
Use complement of SET1 |
|
|
This deletes a range of characters specified in SET1. |
|
|
This replaces consecutive multiple occurrences of characters in SET1 with a single occurrence. |
|
|
This truncates SET1 to the length of SET2. Any extra characters in SET1 will be not considered for translation. |
SETs are a string of characters that can be specified using the following:
- A character class:
[:alnum:],[:digit:],[:alpha:]and so on - A character ...
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