Shell Programming and Scripting

[[ `$adb_path devices|wc -l` -gt 2 ]] && echo "there's a device connected" || (echo "please connect a device" && exit -1) 

[[ `$adb_path devices|wc -l` -gt 2 ]] && echo "there's a device connected" || (echo "please connect a device";exit -1)

exit

echo main shell pid: $$
false || (echo "subshell pid: $$" ; exit 1 )
exit 0

function myText() { # STRING
# Prints the STRING 
# then exits
	local pid="${1:-$$}"
	echo "Subshell pid: $pid"
	# to end the script, use 'return 0|1' to return from function to script
	exit 1 
}

echo "main shell pid: $$"
false  || myText "$$"

echo $?

[[ $($adb_path devices|wc -l) -le 2 ]] && echo "please connect a device" && exit -1 || echo "there's a device connected"

if [[ $($adb_path devices|wc -l) -le 2 ]]
then	echo 'please connect a device'
	exit -1
fi
echo "there's a device connected"

x=$((number % 3))
[[ x -eq 0 ]] && echo 0 || [[ x -eq 1 ]] && echo 1 || echo 2

[[ $($adb_path devices|wc -l) -gt 2 ]] && echo "there's a device connected" || { echo "please connect a device";exit -1;}