Method for querying files under Linux
Find all files starting with PHP in the current directory: find ./ -Name "php *"
Look for a file with greater than 1MB in the current directory and subdirectory: Find ./ Size 1024 (1024 unit is KB)
Find all the files starting with PHP in / var directory: Find / var -Name "PHP *"
Listed all Java files containing the Debug string: grep * .java -l -e "debug"
Listed all Java files that do not contain the Debug string: grep * .java -l -v -e "debug"
Find all Java files that contain debug strings in the current directory: Find -name "* .java" | xargs grep -l -e "debug"