Insert a line at specific line number with sed or awk

Question

I have a script file which I need to modify with another script to insert a text at the 8th line.

String to insert: Project_Name=sowstest, into a file called start.

I tried to use awk and sed, but my command is getting garbled.

Answer 1

sed -i '8i This is Line 8' FILE 

inserts at line 8

This is Line 8 

into file FILE

-i does the modification directly to file FILE, no output to stdout, as mentioned in the comments by glenn jackman.

Answer 2

An ed answer

ed file << END 8i Project_Name=sowstest . w q END 

. on its own line ends input mode; w writes; q quits. GNU ed has a wq command to save and quit, but old ed's don't.

Further reading: https://gnu.org/software/ed/manual/ed_manual.html