My linux cheat sheet
Search files containing string
grep -rnw ./ -e "string"
Totally override destination with source
rsync -avh --delete (--dry-run) /path/to/source/ /path/to/destination/
Find services that uses specific file
#Quick way, process id list
fuser /path/to/file
#Versatile way, more info list
lsof /path/to/file
What files does specific process id uses
lsof -p 12345
What files does process name(s) use
lsof -c apache2 -c mysqld