Linux Find in Files
Just for easy reference...
grep
grep -r "Search String" dir/
grep -inr --include \*.log --include \*.dat "Bananas" ./
-r: recursively -i: ignore-case -n: each output line is preceded by its relative line number in the file --include \*.log: all *.log files (escape with \ just in case you have a directory with asterisks in the filenames) ./: Start at current directory.
find
find . -print0 | xargs -0 grep 'Search String' -sl
PHP files only...
find . -iname '*php' -print0 | xargs -0 grep 'Search String' -sl
Case insensitive double search... (grep -Z is like find -print0)
find . -print0 | xargs -0 grep '_POST' -sliZ | xargs -0 grep 'query' -sli