2

In bash, history -p does history expansion on its argument; What is the alternative in zsh?

2

I'm not aware of any, but see the histverify option which changes the behaviour of history expansion so that when you press enter on a line that contains history operators, the expansion is performed in the editor buffer without running the command.

$ setopt histverify
$ echo !!Enter
$ echo setopt histverifyEnter
setopt histverify

Also note that in zsh like in csh (where history expansion comes from in the late 70s) history modifiers (like :h, :r, :A...) can also be applied to parameter expansions ($var:h...).

And the whole history is accessible with the $history special associative array.

Keys of that associative arrays are the history numbers, and contrary to regular associative arrays where the order is undefined, $history[@] is sorted in descending order on the numerical value of the key.

So ${history:0:1} is the last history entry. So, you can use parameter expansion operators to get the same result as with history expansion operators. For instance: !$:h, could be ${${(z)history:0:1}[-1]:h}

0

In bash you can expand a command by doing this:

history -p !23 

So if in 23 you have ls -l the, return will be:

ls 
-l 

In zsh i am able to reproduce a similar (but not identical) behavior by doing this:

history 23 23 | xargs -n1 | tail -n+2
  • 1
    ITYM history -p '!23'. In zsh, just use print -r -- $history[23] – Stéphane Chazelas Sep 3 '18 at 15:02
  • I tried but nothing happens =(. Try history -p !23 instead of history -p '!23'... for what is really that ? =( – Luciano Andress Martini Sep 3 '18 at 15:04
  • Thanks, but I need more sophisticated behavior; I wanted to run history -p '^(#b)E(?)^E${(l:2::0:)$((match[1]+1))}'. I wrote that function using fc in the end. – HappyFace Sep 4 '18 at 17:49
  • I cant imagine the results you want to got. I just received "History Expansion Failed" (in bash). Can you post in you question what you have, and what exactly you want to get or do? Thank you. Maybe i have a easy solution! – Luciano Andress Martini Sep 4 '18 at 17:54

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