sed use to replace string 2 lines after matching pattern in AIX 6.1

Question

I try to replace a character, 2 lines after matching pattern. For this, I'm using this code:

sed '/some_pattern/{N;N;s/word1/word2/}' /etc/filesystems > /etc/filesystems.tmp && mv -f /etc/filesystems.tmp /etc/filesystems

I tested this command and confirmed it's working fine on Linux. However, when I use it in AIX, I receive an error message like:

sed: Function /some_pattern/{N;N;s/word1/word2/} cannot be parsed.

Any idea?

Answer 1

AIX sed needs each command on a separate line. See man page and try

sed '/some_pattern/{
 N
 N
 s/word1/word2/
}'

Answer 2

This works for me

sed '/some_pattern/{N;N;s/word1/word2/;}'