As of late, and without my deliberately doing anything to make it happen, my Bash prompt has an at sign (i.e. @) prepended to it. This did not previously happen. Nor can I see anything in my ~/.bashrc that seems as though it ought to be making this happen.This is on Debian Jessie GNU/Linux, using GNU Bash.For example, my current Bash sessions look like this:@sampablokuper@debianbox:~$ python3Python 3.4.2 (default, Oct  8 2014, 13:14:40) [GCC 4.9.1] on linuxType help, copyright, credits or license for more information.@>>> 1+23@>>> exit()@sampablokuper@debianbox:~$ whereas originally, they would have looked like this:sampablokuper@debianbox:~$ python3Python 3.4.2 (default, Oct  8 2014, 13:14:40) [GCC 4.9.1] on linuxType help, copyright, credits or license for more information.>>> 1+23>>> exit()sampablokuper@debianbox:~$ Here are all the lines from my ~/.bashrc that appear to in any way relate to the Bash prompt:# set variable identifying the chroot you work in (used in the prompt below)if [ -z ${debian_chroot:-} ] && [ -r /etc/debian_chroot ]; then    debian_chroot=$(cat /etc/debian_chroot)fi# set a fancy prompt (non-color, unless we know we want color)case $TERM in    xterm-color) color_prompt=yes;;esac# uncomment for a colored prompt, if the terminal has the capability; turned# off by default to not distract the user: the focus in a terminal window# should be on the output of commands, not on the prompt#force_color_prompt=yesif [ -n $force_color_prompt ]; then    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then        # We have color support; assume it's compliant with Ecma-48        # (ISO/IEC-6429). (Lack of such support is extremely rare, and such        # a case would tend to support setf rather than setaf.)        color_prompt=yes    else        color_prompt=    fifiif [ $color_prompt = yes ]; then    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ 'else    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ 'fiunset color_prompt force_color_prompt# If this is an xterm set the title to user@host:dircase $TERM inxterm*|rxvt*)    PS1=\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1    ;;*)    ;;esacHow can I get my Bash prompt to appear as it did originally?
Spurious @ symbol at start of bash prompt in Debian Jessie
bash;prompt;readline
Based on a meta discussion, I'm copying @steeldriver's perfectly good AU answer here:You appear to have configured readline to enable edit mode indication. From 8.3.1 Readline Init File Syntax of the Bash Reference Manual:show-mode-in-prompt (Off)       If set to On, add a character to the  beginning  of  the  prompt       indicating  the  editing  mode:  emacs (@), vi command (:) or vi       insertion (+).You should be able to disable it in the current shell usingbind 'set show-mode-in-prompt off'To disable it persistently, you will need to find where it is getting set, possibly your ~/.inputrc or /etc/inputrc files.