g/IFS=['"]\~['"]/s//IFS=$_S_/
g/\*'\~'\*/s//*"$_S_"*/
g/_cmds[^=]*='.*[][!-Z^-}]\~/s/\~/${_S_}/g
g/_cmds[^=]*=".*[][!-Z^-}]\~/s/\~/\\${_S_}/g
g/\~$/s/\~/${_S_}/g
g/\~\$/s/\~/${_S_}/g
w
q