$ sed '4 a\
> `grep "key" temp_file`' desired.txt
Try this one. Option a is for after line no. 4. You can also give option i for before line no. 4
Hopefully this should work.
PriB
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$ sed '4 a\
> `grep "key" temp_file`' desired.txt
Try this one. Option a is for after line no. 4. You can also give option i for before line no. 4
Hopefully this should work.