sed remove all the string after a match code example

Example 1: delete strings after match to eol using sed command

$ cat file | awk -F '\\.com' '{print $1".com"}'
google.com
unix.stackexchange.com
isuckatunix.com

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