oops, the correct command to get actual used size of /dev is df -m /dev | egrep '/dev$' | sed 's/ */ /g'| cut -d ' ' -f 2
one more space on sed
oops, the correct command to get actual used size of /dev is
df -m /dev | egrep '/dev$' | sed 's/ */ /g'| cut -d ' ' -f 2
one more space on sed