How to search for files containing specific word?
With command line you have several options. The 3 I use the most are...
Where . is the directory where you are at the moment and * is a wildcard.
Oh and you can also combine these. Example:
If I recall correctly: locate is the fastest one (assuming your database is up to date) and find is the slowest one. And grep is the most complex one of these since you can use regexes.
The grep command is commonly used for this.
grep PATTERN filename
and grep can do some very complex searching.