‘m a new Ubuntu Linux user. In Linux, Apple OS X or Unix-like systems, how do I reissue or repeat a long command without retying it?
You need to use the history command to display or manipulate the history list on a Linux or Unix-like systems. This command displays the list of commands previously typed with line numbers, prefixing each modified entry with a *.
The bash shell supports a history expansion feature that is similar to the history expansion in csh.
Display list of previously typed commands
Simply type the following command:
history | less
history | grep command-name-here
Fig.01: Bash history command output
How do I reissue a long command without retyping it?
To reissue a command in bash/csh/tcsh/zsh shell, type ! the exclamation point followed by the number of the command you would like to run or repeat. For example, if you would like to reissue command ‘ssh email@example.com’ from the above output i.e. command # 80, type:
Scrolling through the command line history
You can also scroll through the command line history simply by using the [up] and [down] arrow keys too.
Searching the command line history
Press [CTRL-r] from the shell prompt to search backwards through history buffer or file for a command. After pressing [CTRL-r] just type first few command letter such as ssh:
(reverse-i-search)`ssh : ssh -X vivek@nas01
To search all ssh related commands press [CTRL-r] again:
Gif.01: Bash/tcsh/zsh: Command search demo
To repeat last command just type !! at a shell prompt
Say you type a long command:
ssh -X -o UserKnownHostsFile=/dev/null -o CheckHostIP=no -o StrictHostKeyChecking=no -i /Users/veryv/.ssh/google_compute_engine -A -p 22 firstname.lastname@example.org —
To repeat the same last command again, just type !!:
Or you can also refer to the previous command using:
To repeat to the most recent command starting with word ‘ssh’ type:
For more info see man pages – bash(1),zsh(1),tcsh(1)