Replace specific line numbers using sed

Question

I use below to replace text on line numbers 29 to 32:

sed -i '29,32 s/^ *#//' file

How can I further add line numbers i.e. line 35 to 38, line 43 & line 45 in above command?

Answer 1

With GNU sed. m is here a label.

sed -i '29,32bm;35,38bm;43bm;45bm;b;:m;s/^ *#//' file

From man sed:

b label: Branch to label; if label is omitted, branch to end of script.

: label: Label for b and t commands.