How to rerun last command in zsh as sudo

Question

I'm using zsh with oh-my-zsh. I'm trying something very simple:

alias fu='sudo !!'

So, if I issued a command that needed a forgotten sudo I could quickly re-do it.

Yes, I googled for that and I even saw several examples but NONE worked for me. For example:

ls bla bla !! zsh: command not found: !!

I also tried:

ls bla bla fc -e : -1 bla bla # that worked! But let's see with sudo... ls bla bla sudo fc -e : -1 # nothing happens!

Another:

alias redo='sudo $(history -p !!)' # didn't work

I've tried in Mac and Ubuntu, same issues.

History expansion is done before alias expansion. Hence, your !! doesn't get expanded. — user1934428
– user1934428, Commented Jun 3, 2020 at 11:15
I've read here and I can't find out why !! does not work on my zsh terminal. So the whole thing is why my first example is not working. — alanwilter
– alanwilter, Commented Jun 3, 2020 at 12:37
You have the !! inside an alias definition, and as you can see from the link you provided yourself, alias expansion comes later than history expansion. — user1934428
– user1934428, Commented Jun 3, 2020 at 12:40

user1934428 · Accepted Answer · 2020-06-03 11:31:48Z

3

Just an idea (not tested), based on the link you provided in your question (but which explains a bash solution): Instead of an alias redo, you create a function of this name. Inside the function, you can do a

local last_hist=( $(fc -l -1) )

which stores the most recently executed command into the array last_hist, but prefixed by the history number. You remove the history number by

shift last_hist

and execute your sudo command by

sudo "${last_hist[@]}"

However, is it so much more work to just write

sudo !!

instead of your carefully crafted function

redo

?

answered Jun 3, 2020 at 11:31

user1934428

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4 Comments

alanwilter Over a year ago

Your suggestion is a good start, I did this in order to get it working: function fu { local last_hist=( $(fc -l -1) ); shift last_hist; doit="sudo $last_hist"; echo "$doit"; eval $doit }

user1934428 Over a year ago

I don't understand why eval would be needed in this case.

alanwilter Over a year ago

So it can handle commands like ls -l P10*, where * has to be interpreted correctly.

alanwilter Over a year ago

I found the reason for while !! is not working in my zsh. The complete explanation is here. My .zshrc had a line unsetopt BANG_HIST so to keep compatibility with legacy ksh scripts where I used to work. I probably got this from someone there and failed to comment on it. Removing it and !! does work now. But in the end, the best solution I found was cited in a comment here and it's thefuck.

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