'sed' examples

Replace text at line 3

sed -e "3s/oldtext/newtext/" infile > outfile

Replace all occurances

sed -e "s/oldtext/newtext/g" infile > outfile

Print line i

sed -n "$i"p infile

Change aaa to bbb

outfile = 'echo $infile/sed -e "ls/aaa/bbb"'