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Help me to revert the file /root/.ssh/authorized_keys

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Operating Systems Linux Ubuntu Help me to revert the file /root/.ssh/authorized_keys
# 1  
Old 10-07-2017
Help me to revert the file /root/.ssh/authorized_keys
Hi,

I copied the key of rsa.pub to authorized_keys using the below command
Code:
cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys

By mistake i have executed another command
Code:
view cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys

so now additional keys are copied.so please help me how to revert the file ( /root/.ssh/authorized_keys).

Ubuntu 16.04


Thank you


Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!
Help me to revert the file /root/.ssh/authorized_keys-ccat_screenshotpng
Last edited by RudiC; 10-09-2017 at 04:49 AM.. Reason: Added CODE tags.
# 2  
Old 10-07-2017
Can't you just edit the file and remove anything that shouldn't have been added?
# 3  
Old 10-08-2017
Thanks for your suggestion
well,I tried to do.Bit confused which one to delete in the file once i opened it.If something necessary contents are deleted then unexpected behavior will be happend

---------- Post updated at 08:45 AM ---------- Previous update was at 08:08 AM ----------

Hi All,

I created this file in another user directory.I just don't care what i need to do with the wrong data copied
# 4  
Old 10-08-2017
Maybe this will help???
Code:
# Move into the directory containing your files...
cd /root/.ssh

# Determine how many lines are in your corrupted file...
lines=$(wc -l < authorized_keys)

# Determine how many lines are in the file that was mistakenly added...
excess=$(wc -l < id_rsa.pub)

# Print directions...
printf 'authorized_keys contains %d lines.\n' $((lines))
printf 'id_rsa.pub contains %d lines.\n' $((excess))
printf 'Remove the last %d lines (starting with line #%d) from authorized_keys.\n' $((excess)) $((lines - excess + 1))

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