I am working on a VM with Lubuntu 14.04,

I have created a script a.sh,

#!bin/bash

echo "aaaa" >> a.txt

And my /etc/rc.local file is as follows:

#!/bin/sh -e

#

# rc.local

#

# This script is executed at the end of each multiuser runlevel.

# Make sure that the script will "exit 0" on success or any other

# value on error.

#

# In order to enable or disable this script just change the execution

# bits.

#

# By default this script does nothing.



bash /home/sentinel/a.sh

echo "hey" >> /home/sentinel/b.txt

exit 0

On rebooting my machine, I can see b.txt built with content as hey but a.txt is not being built. Can somebody please help me here?