How can you cause gawk (not awk or mawk) to neatly formatthat is, pretty printa gawk program file? (Hint: See the gawk man page.)

Write a sed command that copies a file to standard output, removing all lines that begin with the word Today.

Write a sed command that copies only those lines of a file that begin with the word Today to standard output.

Write a sed command that copies a file to standard output, removing all blank lines (i.e., lines with no characters on them).