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Syntax :

Options -c : complements the set of characters in string.i.e., operations apply to characters not in the given set -d : delete characters in the first set from the output. -s : replaces repeated characters listed in the set1 with single occurrence -t : truncates set1.

Sample Commands

1. How to convert lower case characters to upper case. To convert characters from lower case to upper case, you can either specify a range of characters or use the predefined character classes.

Output:

Output:

or

Output:

Alternatively, you can provide input for the tr command using redirection:

Output:

2. How to translate white-space characters to tabs. The following command translates all the white-space characters to tabs

Output:

In the previous example we can also use redirection to provide intput for tr. Although this time we will use a here string for that:

Output:

3. How to translate braces into parenthesis. You can also translate from and to a file. In this example we will translate braces in a file with parenthesis.

Output:

Output:

The above command will read each character from “geekfile.txt”, translate if it is a brace, and write the output to “newfile.txt”.

4. How to squeeze a sequence of repetitive characters using -s option. To squeeze repetitive occurrences of characters specified in a set use the -s option. This removes repeated instances of characters of the last SET specified. OR we can say that, you can convert multiple continuous spaces with a single space

Output:

And again, accomplish the same task but using a string here:

Output:

5. How to delete specified characters using -d option. To delete specific characters use the -d option. This option deletes characters in the first set specified.

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Or equivalently use:

Output:

6. To remove all the digits from the string, you can use

or

Output:

7. How to complement the sets using -c option You can complement the SET1 using -c option. For example, to remove all characters except digits, you can use the following.

or

Output:

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