To remove all digits (numbers) from input using sed, you can use the following command:
sed 's/[0-9]//g'
This command will search the input for any digits in the range 0-9, and delete them. The g flag specifies that the substitution should be performed globally, on all occurrences of the pattern.
For example, if you have the following input:
This is a test 123456.
Running the sed command above will output:
This is a test .
You can also use the [:digit:] character class to remove all digits from the input:
sed 's/[:digit:]//g'
This will have the same effect as the first command, and remove all digits from the input.
By using the [0-9] pattern or the [:digit:] character class in a sed substitution, you can remove all digits from input. This can be useful for processing text data or for removing numbers from a script.