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Open all files which have some string go directly to the first line where that string is and run command on it.
Other examples:
Run vim only once with multiple files (and just go to string in the first one):
grep -rl string_to_find public_html/css/ | xargs vim +/string_to_find
Run vim for each file, go to string in every one and run command (to delete line):
grep -rl string_to_find public_html/css/ | xargs -I '{}' vim +/string_to_find {} -c ":delete"
There are 7 alternatives - vote for the best!
If you can do better, submit your command here.
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This is a good option when you want to run commands interactivly or do some other stuff after the first command.
To run commands without a blink, , it could be usefull this other command:
vim $(grep string_to_find) -c "/string_to_find" -c " :argdo s/string_to_find/string_replaced/ge | update"