From LedHed's Wiki
Tips -N- Tricks
Search command history
grep -i 'SearchStringHere' ~/.bash_history
View Log Continuously
tail -f /path/to/log/filename
or
Filter a continuous log for a specific entry
tail -f /path/to/log/filename | grep -i 'FilterStringHere'
Dump a .conf file to a new file without the comments (#)
grep -v '#' file.conf > newfile.conf