Bash Scripting

[ZF]

ls | grep -i "somefilename" 1> /dev/null
if [ $? = 0 ];then
#do something
fi

$? stands for the output from previous instruction.
note that if you echo after grep, $? after the echo command will be what the echo function returned.

1>/dev/null
means that stdout is piped to /dev/null

2>/dev/null
means that stderr is piped to /dev/null

cmd 2>&1 1>/dev/null
means stderr is shown only