greycat 1217863358 learn Command substitution: http://wooledge.org/mywiki/CommandSubstitution
yitz_ 1218483651 forget
yitz_ 1218483656 learn Command substitution: See !$(
greycat 1218827307 forget
greycat 1218827345 learn Command substitution -- $(command arg) or `command arg` -- see http://wooledge.org/mywiki/CommandSubstitution
greycat 1236006900 forget
greycat 1236006907 learn #redirect $(