Sudo Hostname

TBotNik · 05-01-2020, 11:39 AM

All,

Having an issue with a BASH script where it needs the hostname running the sudo cmd!

The /etc/hosts file has these settings:

Code:

 i
127.0.0.1	localhost
127.0.1.1	Aspire-LT

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

which usually mean running the cmd "hostname" will return the value from 127.9.1.1, but running that cmd it only says "(none)".

The cmd running in the script is:

Code:

konsole --tabs-from-file ktabs.txt -exv "su -u root -p $mypss"

which is to open the konsole in sudo mode.

Because of the hostname error sudo is not working correctly!

So where do I set the hostname that sudo is looking for?

Any ideas? Thanks!

Cheers!

TBNK

TBotNik · 05-01-2020, 11:50 AM

PS,

File /etc/hostname is set at:

Code:

127.0.1.1       localhost
127.0.1.1       Aspire-LT

Cheers!

TBNK

dc.901 · 05-01-2020, 11:56 AM

What is output of:

Code:

hostname
hostnamectl  | grep -i hostname

And if needed, you can set it:

Code:

hostnamectl set-hostname <hostname>

pan64 · 05-01-2020, 12:11 PM

1. do not mix sudo and su. These are two different tools.

Quote:

Originally Posted by TBotNik

Having an issue with a BASH script where it needs the hostname running the sudo cmd!

Quote:

Originally Posted by TBotNik

Code:

konsole --tabs-from-file ktabs.txt -exv "su -u root -p $mypss"

which is to open the konsole in sudo mode.

2. how do you know it? Are you sure about it?

Quote:

Originally Posted by TBotNik

Because of the hostname error sudo is not working correctly!

ehartman · 05-01-2020, 08:29 PM

Quote:

Originally Posted by TBotNik

Having an issue with a BASH script where it needs the hostname running the sudo cmd!

Here you're talking about sudo

Quote:

konsole --tabs-from-file ktabs.txt -exv "su -u root -p $mypss"

which is to open the konsole in sudo mode.

But here you're using su, not sudo!

Quote:

So where do I set the hostname that sudo is looking for?

Normally with "hostname <the name to set>"

Code:

# Set the hostname.
if [ -r /etc/HOSTNAME ]; then
  /bin/hostname $(cat /etc/HOSTNAME)
else

and as you can see in MY system the file that it is stored in is
/etc/HOSTNAME (all caps)

I've never heard of the file /etc/hostname (all lower case) and the one you quoted seems to be a subset of /etc/hosts

Furthermore the system library doesn't really support gethostname(2), the call that the hostname command uses:

Quote:

The GNU C library does not employ the gethostname() system call;
instead, it implements gethostname() as a library function that calls uname(2)
and copies up to len bytes from the returned nodename field into name.

and

Quote:

the field nodename is meaningless:
it gives the name of the present machine in some undefined network, but typically machines are in more than one network and have several names. Moreover, the kernel has no way of knowing about such things, so it has to be told what to answer here

(from the man pages gethostname(2) and uname(2)
So this suggests too that when never SET the hostname command returns nothing,