Steps to reproduce:

  1. Have zsh as default shell.
  2. Open a new terminal. for example, with Ctrl+Alt+T.
  3. Press Ctrl+Shift+T to open a new terminal tab.
  4. ^T% appears as the first line

I'm running ubuntu 11.10 with lxde and zsh-4.3.11.

Gnome-terminal doesn't have this problem.

Contents of /etc/zsh/zshrc:

# /etc/zsh/zshrc: system-wide .zshrc file for zsh(1).
# This file is sourced only for interactive shells. It
# should contain commands to set up aliases, functions,
# options, key bindings, etc.
# Global Order: zshenv, zprofile, zshrc, zlogin


if [[ "$TERM" != emacs ]]; then
[[ -z "$terminfo[kdch1]" ]] || bindkey -M emacs "$terminfo[kdch1]" delete-char
[[ -z "$terminfo[khome]" ]] || bindkey -M emacs "$terminfo[khome]" beginning-of-line
[[ -z "$terminfo[kend]" ]] || bindkey -M emacs "$terminfo[kend]" end-of-line
[[ -z "$terminfo[kich1]" ]] || bindkey -M emacs "$terminfo[kich1]" overwrite-mode
[[ -z "$terminfo[kdch1]" ]] || bindkey -M vicmd "$terminfo[kdch1]" vi-delete-char
[[ -z "$terminfo[khome]" ]] || bindkey -M vicmd "$terminfo[khome]" vi-beginning-of-line
[[ -z "$terminfo[kend]" ]] || bindkey -M vicmd "$terminfo[kend]" vi-end-of-line
[[ -z "$terminfo[kich1]" ]] || bindkey -M vicmd "$terminfo[kich1]" overwrite-mode

[[ -z "$terminfo[cuu1]" ]] || bindkey -M viins "$terminfo[cuu1]" vi-up-line-or-history
[[ -z "$terminfo[cuf1]" ]] || bindkey -M viins "$terminfo[cuf1]" vi-forward-char
[[ -z "$terminfo[kcuu1]" ]] || bindkey -M viins "$terminfo[kcuu1]" vi-up-line-or-history
[[ -z "$terminfo[kcud1]" ]] || bindkey -M viins "$terminfo[kcud1]" vi-down-line-or-history
[[ -z "$terminfo[kcuf1]" ]] || bindkey -M viins "$terminfo[kcuf1]" vi-forward-char
[[ -z "$terminfo[kcub1]" ]] || bindkey -M viins "$terminfo[kcub1]" vi-backward-char

# ncurses fogyatekos
[[ "$terminfo[kcuu1]" == ""* ]] && bindkey -M viins "${terminfo[kcuu1]/O/[}" vi-up-line-or-history
[[ "$terminfo[kcud1]" == ""* ]] && bindkey -M viins "${terminfo[kcud1]/O/[}" vi-down-line-or-history
[[ "$terminfo[kcuf1]" == ""* ]] && bindkey -M viins "${terminfo[kcuf1]/O/[}" vi-forward-char
[[ "$terminfo[kcub1]" == ""* ]] && bindkey -M viins "${terminfo[kcub1]/O/[}" vi-backward-char
[[ "$terminfo[khome]" == ""* ]] && bindkey -M viins "${terminfo[khome]/O/[}" beginning-of-line
[[ "$terminfo[kend]" == ""* ]] && bindkey -M viins "${terminfo[kend]/O/[}" end-of-line
[[ "$terminfo[khome]" == ""* ]] && bindkey -M emacs "${terminfo[khome]/O/[}" beginning-of-line
[[ "$terminfo[kend]" == ""* ]] && bindkey -M emacs "${terminfo[kend]/O/[}" end-of-line

zstyle ':completion:*:sudo:*' command-path /usr/local/sbin /usr/local/bin \
                 /usr/sbin /usr/bin /sbin /bin /usr/X11R6/bin

unalias run-help
autoload run-help

# If you don't want compinit called here, place the line
# skip_global_compinit=1
# in your $ZDOTDIR/.zshenv or $ZDOTDIR/.zprofice
if [[ -z "$skip_global_compinit" ]]; then
  autoload -U compinit

Contents of ~/.zshrc:

# The following lines were added by compinstall

zstyle ':completion:*' completer _expand _complete _ignored _correct _approximate
zstyle ':completion:*' group-name ''
zstyle ':completion:*' list-colors ''
zstyle ':completion:*' matcher-list '' 'm:{[:lower:]}={[:upper:]} m:{[:lower:][:upper:]}={[:upper:][:lower:]}' 'r:|[._-]=* r:|=*' '+l:|=* r:|=*'
zstyle :compinstall filename '/home/kirill/.zshrc'

autoload -Uz compinit promptinit zcalc zsh-mime-setup
# End of lines added by compinstall
# Lines configured by zsh-newuser-install
setopt appendhistory autocd extendedglob notify sharehistory
#{{{ Shell Conveniences

# some more ls aliases
alias ls='ls --color'
alias lt='ls --color -ltr'
alias ll='ls -l'
alias lh='ls -l -h'
alias la='ls -A'
alias l='ls -CF'
alias vir='vim -R'
alias vimnw='vim -R +"set nowrap"'
alias tok='top -n1 -b -u kirill'
alias gt='gnome-terminal'
alias gts='gnome-terminal --window-with-profile=shnurov'

#alias tv='/usr/toolworks/totalview.8.6.2-2/bin/totalview'
#alias mpic='mpiCC.openmpi -o main -I/usr/local/include/boost-1_39/ main.cc -Llibdir -lboost_mpi-gcc43-mt-1_39 -lboost_serialization-gcc43-mt-1_39'
#alias mpir='mpirun.openmpi -np 7 ./main'
alias sage='~/progs/sage-4.8/sage'
#alias gmolden='/home/kirill/progs/molden/gmolden'
#alias molden='/home/kirill/progs/molden/molden'
#export LD_LIBRARY_PATH=/home/kirill/progs/molekel_5_4_0_linux_x86_64/lib:$LD_LIBRARY_PATH
#alias molekel='/home/kirill/progs/molekel_5_4_0_linux_x86_64/bin/Molekel'
#alias molekel='source /home/kirill/progs/molekel_5_4_0_linux_x86_64/launch_molekel.sh'
alias duh='du -s -h'
alias mam='make; time ./main'
alias mac='make clean;make;time ./main'
alias atdtool='~/progs/atdtool/atdtool'
alias acro='acroread -openInNewWindow'

bindkey -e

bindkey "^[[A" history-beginning-search-backward
bindkey "^[[B" history-beginning-search-forward
# End of lines configured by zsh-newuser-install
# Customize to your needs...
export PATH=/opt/intel/composer_xe_2011_sp1.6.233/bin/intel64:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/opt/intel/composer_xe_2011_sp1.6.233/mpirt/bin/intel64
#source /opt/intel/bin/compilervars.sh intel64

autoload -U colors && colors

#PROMPT="${fg_red}%*${fg_white}${at_normal}.${fg_cyan}%~${fg_white}  ${bg_grey}

That's an lxterminal bug.

It doesn't show in other shells because zsh is nice enough to try and show you hidden characters showed by the previous command when you don't include a trailing newline before issuing a prompt.

If you type echo -n foo, you'll see foo%. The % indicates that there was no newline character. Above, what happens is that lxterminal outputs that ^T before running the shell.

In other shells, instead of ^T%\nprompt>, you see ^Tprompt.

Lxterminal has another bug BTW in that it ignores the value of $SHELL.

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