I'm working on a mini machine(MEM: 256M), its OS is linux.
I wrote a bash script, which would be executed while the system is booting (executing command is added into /etc/rc.local).
In this script, there is a command echo "a_long_string" >> /etc/custom_config.
a_long_string is a string, whose length is 248.
To test the script, I rebooted the system many times and I found an issue:
Sometimes, the command echo "a_long_string" >> /etc/custom_config will append 248 NULL characters plus the a_long_string, which means that, normally after executing this command, we could find the a_long_string at the end of the file /etc/custom_config, but sometimes I do find that the appended string becomes as below:
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@...a_long_string
I'm trying to figure out what happened. Does echo a long string may cause some issue like this on a small RAM system?