Terminal prompt showing random, green happy unicode faces or angry red faces, depending on the exit code.

gistfile1.txt

# emoticon version   :)   :(
export PS1="${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \`if [ \$? = 0 ]; then echo -e '\[\e[01;32m\]:)'; else echo -e '\[\e[01;31m\]:( ('$?')'; fi\` \[\033[00m\]\n\$ "

# simple unicode version   ¬_¬    😱 
export PS1="${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \`if [ \$? = 0 ]; then echo -e '\[\e[01;32m\]¬_¬'; else echo -e '\[\e[01;31m\]😱 ('$?')'; fi\` \[\033[00m\]\n\$ "


# randomly selected smiles / frowns... see more at http://wrttn.me/30dbfd/
smiles="¬_¬
(^o^)
o_o
☆彡
(^0_0^)
:)"
smiles=($smiles)
num_smiles=${#smiles[*]}

frowns="●～*
(╯°□°）╯︵┻━┻
（　ﾟДﾟ）
<コ:彡
</3
O.o
😱
๏_๏
☹ 🔫
﴾͡๏̯͡๏﴿ O'RLY?
(︺︹︺)
:("
frowns=($frowns)
num_frowns=${#frowns[*]}

face() {
 code=$?
 if [ $code = 0 ]
   then printf "\e[01;32m${smiles[$((RANDOM%num_smiles))]}"
   else printf "\e[01;31m${frowns[$((RANDOM%num_frowns))]} ($code)" 
 fi
}

export PS1="${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[01;34m\] \w\[\033[00m\]$(__git_ps1) \$(face) \[\033[00m\]\n\$ "