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Editorial Team
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Asked: 2026-06-17T15:55:09+00:00

I have a series of devices that I need to SSH into, modify some

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I have a series of devices that I need to SSH into, modify some files changing the device name, and network settings.

The files contain data such as:

NETWORK_ETH1_CLIENTIP_LIST='10.47.19.182'

HOSTNAME="c50"

I am using putty to ssh in to the system, and then using nano to modify each file.

I believe it would be easy to script but I am not too sure of the linux commands for what I would like to do.

Are there commands in linux I could use that could search for strings within a specified text file, e.g. “HOSTNAME” and replace the found line with the new HOSTNAME?

I am current using plink for some of easier system checks that I call from batch files:

plink.exe -pw PASSWORD USERNAME@192.168.77.77 -m Commands/SystemChecks.txt

Username and password have been omitted. SystemChecks contains some basic lookup table and ping commands etc to test if the device was successfully modified.

What I need help with is figuring out a way to find and replace data (hostname, ip address, netmasks etc) using linux commands.

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1 Answer

  1. Editorial Team

    you can use sed to blow the line away and re-write the content with echo. I’m sure there is probably more elegant way to replace just the value

    target='/path/to/target_file'
sed -i "/HOSTNAME/d" $target
echo "HOSTNAME=\"newhostname\"" >> $target
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