The output redirection can be used with any command. Try the following command which prints all the files in the /bin directory into the file output: ls la /bin > output

Q:What is output of the command?

The output redirection > creates a file if it doesnt exist, and over-writes its contents if the file exists. Try the following command which prints the lists of users into the output file you created earlier: who > output

Q:what is output of the command?

Use the cat command to display the contents of the output file.

Q:The previous contents have been over-written or not.

The output re-direction >> can be used to append contents to an existing file. Try this: date >> output.

Q:Where is the difference comparing to the previous contents of the output file?