delete string after character in each line linux code example

Example 1: bash remove everything after character x

echo "Hello: world" | cut -f1 -d":"

Example 2: delete strings after match to eol using sed command

# You can use awk's field separator (-F) following way:
$ cat file
google.com/funny
unix.stackexchange.com/questions
isuckatunix.com/ireallydo