adler/shared memory for postgres

## shared memory for postgres
# get half of number of bytes of total memory
SHMMAX=$(free | perl -ane 'printf "%1.0f\n", ($F[1] * 512 ) if m/Mem:/')
grep -q kernel.shmmax /etc/sysctl.conf || echo "kernel.shmmax =  $SHMMAX" | sudo tee -a /etc/sysctl.conf
sudo sysctl -p
	# get half of number of bytes of total memory
	SHMMAX=$(free \| perl -ane 'printf "%1.0f\n", ($F[1] * 512 ) if m/Mem:/')
	grep -q kernel.shmmax /etc/sysctl.conf \|\| echo "kernel.shmmax = $SHMMAX" \| sudo tee -a /etc/sysctl.conf
	sudo sysctl -p