[SOLVED] combine sed d and sed a scripts to a single script

Issue

file xz.txt

123
456
789

I want to merge

sed -i '1d'  xz.txt
sed -i '1a abc' xz.txt

I tried

sed -i -e '1d' -e '1a abc' xz.txt

expect to get

456
abc
789

but I got

456
789

sed (GNU sed) 4.7 but it doesn't work, any help?

Solution

Sed goes line by line, first command 1d - deleted 1st line, 1st line is gone, there is no more 1st line, that is why second command 1a abc didn't work. Here is how it should be:

$ sed '1d; 2a abc' f
456
abc
789

Answered By - Ivan

Answer Checked By - Senaida (WPSolving Volunteer)