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edit text file with sudo via ssh and script

rated 0 times [ 0] [ 0] / answers: 1 / hits: 5083 / 2 Years ago, thu, april 7, 2022, 10:48:26

I want to modify /etc/hosts (and later also hostname) via a script and ssh.
So I'm logged in via ssh and this works:

sudo nano /etc/hosts

It shows the remote hosts file in nano. However I was trying this (via commandline, but this should work in order to make it work in a script right?):

echo [mypassword] | sudo -S nano /etc/hosts

but get this output:

Recieved SIGHUP or SIGTERM



Buffer written to /etc/hosts.save

I just saw that this also happens with more simple text-files (e.g. test.txt). Any ideas how to fix this?

And yes, I am aware of the insecurity of the clear password. :)

Thanks in advance

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alkeake

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3 Years ago

answered 2 Years ago odyroc · Accepted Answer

What worked for me is writing in a temporary file and replacing /etc/hosts with it

#!/bin/bash



# $1: IP of the new host

# $2: name of the new host



# read current /etc/hosts int temp-file

cat /etc/hosts > tmphost

# add new entry to temp-file

echo "$1 $2" >> tmphost

# replace hosts file

sudo cp tmphost /etc/hosts

# remove temp-file

rm tmphost

like @Pasi suggested, this needs passwordless sudo