1head -c 1 </dev/urandom >/dev/shm/1B 2head -c $((8*1024*1024-1)) </dev/urandom >/dev/shm/8MB-1 3head -c $((8*1024*1024+1)) </dev/urandom >/dev/shm/8MB+1 4head -c $((128*1024*1024)) </dev/urandom >/dev/shm/128MB 5head -c $((4*1024*1024*1024)) </dev/urandom >/dev/shm/4GB 6head -c $((30*1024*1024*1024)) </dev/urandom >/dev/shm/30GB 7 8head -c 1 </dev/urandom >/1B 9head -c $((8*1024*1024-1)) </dev/urandom >/8MB-1 10head -c $((8*1024*1024+1)) </dev/urandom >/8MB+1 11head -c $((128*1024*1024)) </dev/urandom >/128MB 12head -c $((4*1024*1024*1024)) </dev/urandom >/4GB 13head -c $((30*1024*1024*1024)) </dev/urandom >/30GB 14