This thread lacks a lot of info. You just forgot to cite you must have busybox installed and that this line should be put in install-recovery-2.sh if running Android 4.3 firmware to avoid conflicts with daemonsu...
You didn't search enough
Sony Xperia M dual [C2004]
ROM: 15.5.A.1.5 (stock)
Android version: 4.3 (rooted)
Bootloader: locked (unlockable)