cmd:sqt/sdq string quote & dequote 

bash$ alias sqt='sed "s/'\''/'\''\\\\'\'''\''/g; s/^/'\''/; s/$/'\''/"'
bash$ alias sdq='echo '
bash$ sqt
sed "s/'/'\\\\''/g; s/^/'/; s/$/'/"
'sed "s/'\''/'\''\\\\'\'''\''/g; s/^/'\''/; s/$/'\''/"'
bash$ sdq 'sed "s/'\''/'\''\\\\'\'''\''/g; s/^/'\''/; s/$/'\''/"'
sed "s/'/'\\\\''/g; s/^/'/; s/$/'/"
bash$

documented on: 2000.06.06 Tue 12:04:40