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Script to overwrite & before that keep copy a file on many servers

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# 1  
Old 10-12-2013
Script to overwrite & before that keep copy a file on many servers
I have ssh password less auth enable & script does the job well as well
Code:
#/bin/bash
for i in `cat ip`
do
scp /etc/resolv.conf root@$ip
done


But I need to take backup of the file i will overwrite .. is there any simple way ?

Kindly respond
Last edited by Scrutinizer; 10-12-2013 at 08:50 PM.. Reason: code tags
# 2  
Old 10-12-2013
Code:
#/bin/bash
for i in `cat ip`
do
ssh $ip 'tar cvf /path/to/archive/resolve.tar  /etc/resolve.conf'
scp /etc/resolv.conf root@$ip
done

[/path/to/archive] example directory - has to exist

Allowing root to ssh into a box is considered a security issue. FWIW....
This User Gave Thanks to jim mcnamara For This Post:
heman96
# 3  
Old 10-13-2013
Code:
#!/bin/bash
file=/etc/resolve.conf
for i in `cat ip`
do
<$file ssh root@$ip "
cp -p $file $file.bak && cat >$file
"
done

Last edited by MadeInGermany; 10-13-2013 at 12:26 AM..
This User Gave Thanks to MadeInGermany For This Post:
heman96
# 4  
Old 10-13-2013
Thanks Guys its fixed... silly mistake i did .. fix is simple
Code:
#/bin/bash
for i in `cat ip`
do
ssh $ip mv /etc/resolv.conf /root/backup/resolv.conf.`date +"%m-%d-%y-%T"`
scp /etc/resolv.conf root@$ip
done

Last edited by Scrutinizer; 10-13-2013 at 03:05 AM.. Reason: code tags
# 5  
Old 10-13-2013
Do not use mvfor this!
A safe backup is cp -p.
1. It retains the inode: leaves links, owner,group,permissions intact.
And 2. does not risk a malfunction, e.g. your second access could fail because the accessing host cannot be determined.
For reason 1 the file should be overwritten with cp; your scp is safe.
# 6  
Old 10-13-2013
In addition, cp -p is also not entirely safe unless you test its outcome and make that determine whether the scp can proceed or not...
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