A real quine in Bash

quine.sh

#!/bin/bash

T='#!/bin/bash


Q=$(printf "\x27")  # A literal single quote

echo "$T" | head -n2 -
echo T=$Q"$T"$Q
echo "$T" | tail -n6 -'

Q=$(printf "\x27")  # A literal single quote

echo "$T" | head -n2 -
echo T=$Q"$T"$Q
echo "$T" | tail -n6 -

echo $BASH_COMMAND

:)

Very good! I had to be very careful copying this -- copy and paste got it wrong (but created a different quine).

I preferred a slight change, to use the "-n+NUM" form of tail, to match the argument to head, and change the shebang to match my preferred usage, and wound up with:

#!/usr/bin/env bash
# As seen at https://gist.github.com/scvalex/5360004

T='#!/usr/bin/env bash
# As seen at https://gist.github.com/scvalex/5360004

Q=$(printf "\x27")  # A literal single quote

echo "$T" | head -n3 -
echo T=$Q"$T"$Q
echo "$T" | tail -n+3 -'

Q=$(printf "\x27")  # A literal single quote

echo "$T" | head -n3 -
echo T=$Q"$T"$Q
echo "$T" | tail -n+3 -