Question

I currently want to extract a value from a SQL command responde

somehting like this:

psql db -c "SELECT COUNT(test) FROM tbTest;"

the result is:

 count
------
 33176
(1 row)

I want to extract the 33176 value… is there any simple way to do this?

Answer 1

If it is always return in that format (expected result on line 3), you can use this:

psql db -c "SELECT COUNT(test) FROM tbTest;" | tail -n 2 | head -n 1

The explanation:

tail -n 2 will get the last 2 line and then processed by head -n 1 which mean, get first 1 line.