Control-Y is a computer command that can be found on most computer keyboards by holding down Ctrl and pressing the Y key. Extundelete is an open-source application that can be used to recover deleted files from a partition or a disk using either the EXT3 or EXT4 file systems. You can’t skip or undo any actions because they have to be undone or replaced in the order they were performed. You can delete or repeat a single or multiple typing actions with the undo and redo features. There is no undo command in Linux, but you can view the last run by using the ‘history’ command. After pressing CTRL Y, you can reverse your last undo. How Do I Undo A Previous Command?īy pressing CTRL-Z, you can reverse your previous action as well as more than one. Navigate to $HOME/.profile in C to edit your shell history. Even after executing a command line that was previously executed, the previously executed line can still be edited or re-executed. Logout and environment resets ensure that the history file is always up to date. You can change the command history using the vi editing keys once the vi option is enabled. Details of the VISUAL and EDITOR variables can be found in ksh(C). The vi editing mode can be set in the shell using the ksh command set -o vi. When you issue a command to the Korn shell, it adds it to a list of previously executed commands. With the help of the Korn shell, commands can be typed more quickly. To edit the next command, press the Down arrow key. You can then use the Left and Right arrow keys to edit the command. This will bring up the last command you entered. To edit the previous command, press the Up arrow key. If you make a mistake when typing a command in the Linux terminal, you can use the arrow keys to edit the command.
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