How to search for files containing specific word?

With command line you have several options. The 3 I use the most are...

1. locate {part_of_word}

   This assumes your locate-database is up to date but you can update this manually with: sudo updatedb

2. grep as explained by dr_willis. One remark: -R after grep also searched within directories. Example:

   cd\
   grep -R {something_to_look_for} {where_to_look_in}
   

3. find . -name '*{part_of_word}*' -print

Where . is the directory where you are at the moment and * is a wildcard.

Oh and you can also combine these. Example: locate {something}|grep {some_part_of_something}|more

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 but also the most versatile one of these since you can use regexes.

grep -R "what" "where"

example:

grep -R hello /home

You can use grep to list the files containing word in the given directory:

grep -Ril word directory

Here:
* -R recursively search files in sub-directories.
* -i ignore text case
* -l show file names instead of file contents portions. (note: -L shows file names that do not contain the word).

use man grep to get all the options