sed

Display context # print 1 line of context before and after regexp, with line number # indicating where the regexp occurred (similar to "grep -A1 -B1") $ sed -n -e '/regexp/{=;x;1!p;g;$!N;p;D;}' -e h Delete consecutive blank lines # delete all CONSECUTIVE blank lines from file except the first; also # deletes all blank lines from top and end of file (emulates "cat -s") $ sed '/./,/^$/!d' # method 1, allows 0 blanks at top, 1 at EOF $ sed '/^$/N;/\n$/D' # method 2, allows 1 blank at top, 0 at EOF »