Examples :
1. Basic Example
$ cat -vet file2 One Two Three Four Five six seven$ One Two Three Four Five six seven$ One Two Three Four Five six seven$ One Two Three Four Five six seven$ One Two Three Four Five six seven$ One Two Three Four Five six seven$ One Two Three Four Five six seven$ One Two Three Four Five six seven$
By using the “cat -vet” option against file1, we can see that the tabs are represented by the “I^” character.The “$” denotes a line feed.
$ unexpand -a file2 > file3 $ cat -vet file3 One^ITwo^IThree^IFour^IFive^Isix^Iseven$ One^ITwo^IThree^IFour^IFive^Isix^Iseven$ One^ITwo^IThree^IFour^IFive^Isix^Iseven$ One^ITwo^IThree^IFour^IFive^Isix^Iseven$ One^ITwo^IThree^IFour^IFive^Isix^Iseven$ One^ITwo^IThree^IFour^IFive^Isix^Iseven$ One^ITwo^IThree^IFour^IFive^Isix^Iseven$ One^ITwo^IThree^IFour^IFive^Isix^Iseven$
Hece the spaces are converted into tabs.
Network and Security Professional 