>>      toggle-rdoc () {
>>          local FILE="$HOME/.gemrc"
>>          { rm $FILE &&
>>            awk '/^#/ {sub(/^#/, "", $0); print; next};
>>                    /^[^#]/ {sub(/^/, "#", $0); print}' > $FILE
>>          } < $FILE
>>          cat $FILE
>>      }

>>  It works, but it just seems like there ought to be an easier way. I
>>  couldn't get it to work with sed for some reason; it seems to need
>>  some serious branching to work at all in sed. Here's what I tried in
>>  sed:

>>      alias toggle-rdoc='sed -ri "/^#/{ s/^#// }; s/^([^#])/#\1/"
>>  ~/.gemrc; cat ~/.gemrc'

>>  but the results are always the same; no toggling happens at all.
>>  *sigh*

>>  Can anyone think of a more elegant solution for this problem?

> Why not use printf instead of sub?

> awk ' /^[^#]/ {printf("#%s\n", $0)}'