I am starting to learn some Regex, therefore I use this command repeatedly:
grep pattern /usr/share/dict/american-english
Only the part with pattern changes, so I have to write the long expression “/usr/share/dict/american-english” again and again.
Someone made the remark that it is possible to expand an argument of a command from the command history by typing cryptic character combinations instead of the full expression.
Could you tell me those cryptic character combinations ?
Here is Solutions:
You can use
<Esc>. if your Meta key is being used for something else), that is, Meta-dot (or <esc> dot), where Meta is usually the Alt key, to recall the last argument of the previous command. So, first you would type
$ grep foo /usr/share/dict/american-english
And then if you wanted to grep for something else, you would type
$ grep bar
After typing a space and then Esc. (that is, first pressing the escape key, and then the period key):
$ grep bar /usr/share/dict/american-english
You can also use either of the following:
$ grep bar !:2 $ grep bar !$
!$ mean “second argument” and “last argument” respectively.
In general (with Bash)
<Esc> N <Esc> . will recall the N’th argument from the previous command into the current command line (where N is 0-based).
For the second argument from the last command, that would be:
<Esc> 1 <Esc> .
If you wanted the third argument, then
<Esc> 2 <Esc> .
… and so on.
As others have mentioned, if you want the last argument from the previous command, there’s a specific shortcut for that in just:
Note: Use and implement solution 1 because this method fully tested our system.
Thank you 🙂