shithub: trueawk

ref: 7d562f0dff4db4ea7f7e91f462c4adf552b1b410
dir: /testdir/t.gsub4/

length($1) == 0 { next }

{gsub("[" $1 "]","(&)"); print}
{gsub("[" $1 "]","(\\&)"); print}