Useful unix commands

This is a gist where I save useful unix commands as I come across them.

	#To check which programs are running on which ports
	sudo lsof -i :80 # checks port 80
	COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
	haproxy 32850 root 4u IPv4 0xf27d639a63f41339 0t0 TCP *:http (LISTEN)
	#To watch changes to a given folder
	#To install this command on mac check out this link: http://osxdaily.com/2010/08/22/install-watch-command-on-os-x
	watch -d ls -l
	#Displays the file system disk space usage
	df -k
	uname -a
	Darwin adil.local 13.1.0 Darwin Kernel Version 13.1.0: Thu Jan 16 19:40:37 PST 2014; root:xnu-2422.90.20~2/RELEASE_X86_64 x86_64
	#find filenames quickly
	locate crontab
	#changing the ulimit and starting mongo in the background
	ulimit -n 2048 && sudo ./mongod --fork --logpath /var/log/mongodb.log

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