###############################
#output to pipe
###############################

#ONLY STDERR goes to the pipe (each line accomplishes the same)

	vgs -o alltags > /dev/null    | grep tags
	vgs -o alltags 3>&1 1>&2 2>&3 | grep tags

#BOTH STDERR and STDOUT go to the pipe

	vgs -o alltags 3>&1 2>&3 | grep tags

###############################
#output to file
###############################

#stderr and stdout to same file

	#both outputs go to the same file
	cmd > /tmp/myfile 2>&1

	#hide the output, sending it all to the bitbucket
	cmd > /dev/null   2>&1