Add line after matching a pattern [duplicate]

Question

I have a file say test with following values

Linux
Solaris
Fedora
Ubuntu
AIX
HPUX

How to add a line with system hostname after the line matching AIX? If I do

echo `hostname` >> test

system hostname comes at the last after HPUX.

Answer 1

Could you please try following awk and let me know if this helps you.

 awk -v host=$(hostname) '$0 == "AIX"{print $0 RS host;next} 1'  Input_file

EDIT: Adding 1 more solution too here.

awk -v host=$(hostname) '{printf("%s%s\n",$0,$0=="AIX"?RS host:"")}'