How to delete everything in a string after a specific character?

Question

Example:

    before: text_before_specific_character(specific_character)text_to_be_deleted
    after: text_before_specific_character

I know that

Answer 1

What you're looking for is actually really easy:

sed 's/A.*//'

Where A marks the specific character. Note that it is case sensitive, if you want to catch multiple characters use

sed 's/[aAbB].*//'