Stuck on cat /sdcard/flash_image > /system/bin/flash_image

I'm a super noob. I'm using a terminal so it has the # before each. I wouldn't put adb in would I.

I'm following this

su
mount -o remount,rw -t yaffs2 /dev/block/mtdblock5 /system
cat /sdcard/flash_image > /system/bin/flash_image
chmod 755 /system/bin/flash_image
mount -o remount,ro -t yaffs2 /dev/block/mtdblock5
flash_image recovery /sdcard/recovery.img
reboot recovery

are you suggesting I do this
su
mount -o remount,rw -t yaffs2 /dev/block/mtdblock5 /system
remount
shell
cat /sdcard/flash_image > /system/bin/flash_image
chmod 755 /system/bin/flash_image
mount -o remount,ro -t yaffs2 /dev/block/mtdblock5
flash_image recovery /sdcard/recovery.img
reboot recovery
 
this is what it says
su

mount -o remount,rw -t yaffs2 /dev/block/mtdblock5 /system

Usage: mount [-r] [-w] [-o options] [-t type] device directory

cat /sdcard/flash_image > /system/bin/flash_image

cannot create /system/bin/flash_image: read only file system

chmod 755 /system/bin/flash_image

Unable to chmod 755 /system/bin/flash_image: No such file directory

mount -o remount,ro -t yaffs2 /dev/block/mtdblock5/system

Usage: mount [-r] [-w] [-o options] [-t type] device directory

flash_image recovery /sdcard/recovery.img

flash_image: not found