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if vi is the default editor than :

1)write a=1
2) pass to command mode (key esc)
3) press key v
4) write your follwing code
5) save and quit the editor

Just one line : :b:

paste f1 f2 |awk '{if ($1 == $2) print $1}'

Just one line : :b:

paste f1 f2 |awk '{if ($1 == $2) print $1}'