July 26, 2023

Copy a command from the shell history to the clipboard

To copy a command from the shell history to the clipboard run:

$ echo [event designator]:q  | xclip -i

An event designator is a reference to a command line entry in the history of the shell¹. For example if you want to run the last command again, run $ !-1 or the synonym $ !!.

The q that comes after the event designator is a modifier which tells bash to enclose the substitution (e.g. !!) in single quotes (’) to prevent further expansion by the shell.”². Modifiers are always preceded by a colon, i.e. :.

The option -i, short for -in, tells xclip to read (copy) text into the clipboard from standard input, which is piped from the previous command. That is what the vertical bar | (called ‘pipe’) is for.

So, with all this we can for example do

$ echo !!:q  | xclip -i

which will copy the last command ran to the clipboard. Or

$ echo !-2:q | xclip -i

which will copy the penultimate command ran to the clipboard.

If you can’t count how far back in history is the command you want to copy to the clipboard, run:

$ history | less

and check the number of the line of the command you need to copy , then run:

$ echo !n:q | xclip -i

n refers to command line on line n of the shell history.

Then you can paste the command using Shift + Insert.

If you need to install xclip, run:

$ sudo apt install xclip

You can also copy a command from the shell history to a file.

To learn more about event designators run $ man history then type /Event Designators; about xclip run $ man xclip.

xclip is copyleft-licensed and is maintained by Peter Åstrand.

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1. From the man page.↩︎

2. in the words of a GNU/Linux contributor.↩︎

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I do self-funded research and I'm writing a book.

> What's the book about?

About technologies and agency.

Meaning, technologies can foster agency. No doubt. But I am also asking:

Can usage of technologies give us a sense of empowerment while in fact undermining our abilities?

I posted a summary of the prologue on the homepage: https://yctct.com/

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