how to know the password is "null"

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# 1  
how to know the password is "null"

I have a linux os, the login account is "root" without password, I want to set a password automatically when the os bootup, the first thing is I need to judge the "password" is null, if it's null then I set the password, how could I know it's "null" with bash?

# 2  

I don't think u can have a "null" password in any modern Linux OS es.
# 3  
Not sure how your files are configured, and obviously... don't post it here for example... But, check column 2 of /etc/shadow, that's where your password hash is stored.
# 4  
Originally Posted by jamie_123

I don't think u can have a "null" password in any modern Linux OS es.
No, for now yocto linux has no password by defult

---------- Post updated at 09:37 AM ---------- Previous update was at 09:36 AM ----------

Originally Posted by jtollefson
Not sure how your files are configured, and obviously... don't post it here for example... But, check column 2 of /etc/shadow, that's where your password hash is stored.
but I could I judge the password is not set with bash(now my password is not set)?
# 5  
And you could have the case of passwd set but value is null... (pressed [Enter]...)
You would see a passwd hash... though empty...

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