Hi, this is Sandra Henry-Stocker, author of the "Unix as a Second Language" blog on NetworkWorld. In today’s 2-minute Linux tip, we’re going to look at the bash history command – a tool that shows you commands you’ve recently used and allows you to use them again without having to retype them. Here’s how the history command works: Type “history” and you’ll see the commands you’ve run recently. How many commands you see will depend on the size of your history buffer. Generally, that will be the last 100 or 1,000 commands that you’ve typed. $ history 59 history 60 who 61 cal 62 h 63 alias h=history 64 c 65 h You can use the command “echo $HISTSIZE” to see how many commands your account is configured to remember. $ echo $HISTSIZE If you only want to look at the last few commands you’ve used, pipe the history output to a tail command like this: $ history | tail 3 Note that the most recent commands are at the bottom of the history output. You can reuse a command by pressing the up arrow key on your keyboard. When you reach the command you want to reuse, press enter. You can also repeat a recent command by typing an exclamation mark following by the first letter or the number preceding the command in your history display. $ !22 $ !e You can also repeat a command, but make changes before you run it. That’s your 2-minute Linux tip for today. If you liked this video, please hit the like and share buttons. For more Linux tips, be sure to follow us on Facebook, YouTube and NetworkWorld.com.