zsh interpret some %[a-z] in command line

[Pierre Chef]

Binary package hint: zsh

On command line, zsh interprets some %<letter> without possibility to escape it.
It is especially a problem with date which uses % in its format.

zsh /tmp$ date "+%d/%m %kh%M"
]0;date "+/tmp/ubuntu hubuntu"23/09 17h15

bash /tmp$ date "+%d/%m %kh%M"
23/09 17h15

This bug only appears on command line, not in script or when you pipe commands
zsh /tmp$ date "+%d/%m %kh%M" | less
will show the good result in less.

zsh 4.3.9-4ubuntu1
bash 3.2-5ubuntu1
coreutils 6.10-6ubuntu1

[Pierre Chef (pierre.chef)]

In fact, it is due to this line in prexec used to put the current command in the terminal title.
preexec() {
             print -Pn "\e]0;$1\a"
        }

I found this information here https://bbs.archlinux.org/viewtopic.php?id=107834

[Daniel Hahler (blueyed)]

This preexec does not get shipped with Ubuntu, does it?

You might want to escape it using $'', like:
   print -Pn $'\e]0;$1\a'

See also the "print"'s in the title() function of my oh-my-zsh fork at:
https://github.com/blueyed/oh-my-zsh/blob/8d5105135772ae0c3c81850cea422cc322ed6f7d/lib/termsupport.zsh#L27

[kk_hephot (ksk)]

According to the post here: <https://bbs.archlinux.org/viewtopic.php?id=107834> you simply need to amend $1 to ${~1:gs/%/%%}. That works for me.