Search files for text, get files and line numbers.

Use the find command with grep to find items in your project files.

Here I will search PHP files ('*.php') in my project (current directory as denoted by the period) and print out the file and line number within any file that contains a print_r statement.

$ find . -name '*.php' -print | xargs grep -Hn 'print_r';

Another example: search your computer for .lock files (Good for when your server crashes and breaks Mongo). Use 'sudo' if you don't have privileges to search all files.

$ sudo find / -name '*.lock'