CSC231 Bash Tutorial 4
--D. Thiebaut (talk) 14:13, 22 February 2017 (EST)
<showafterdate after="20170224 13:00" before="20170601 00:00">
Using the Vi Editor
Redirection
- We have seen in the previous lab how to use pipes to take the output of a program and feed it to the input of another.
- Redirection is similar, except that the input or the output is fed from, or fed to a file, respectively.
Example 1: storing the output of a command into a file
- Try this:
last
- this will list the last login times of all the users on Aurora. If you want to target a particular user, say 231b, you can try this:
last | grep "231b " (make sure there's a space after the b)
- Assume you want to store these login time into a file, so that you can share it with somebody else, or send as an attachment. You simply use the > sign to store the output of the last command into a file:
last | grep "231b " > logins231b.txt
- You won't see any output, as it is being redirected. Look at the files in your directory and see that you have a new file called logins231b.txt.
- Display the contents of this file with the cat or with the less command.
You now have a new way of storing the output of a program into a file.
</showafterdate>
