Bash While loop is not looping

Question

Im doing a backup script for Mikrotik devices using bash. I want to use a while loop that will read from a file.

The Contents of the file to read from will be like:

1.1.1.1 router1
2.2.2.2 router2

Here is my sample script:

while read -r ip name
do

sshpass -p "pass" ssh -o StrictHostKeyChecking=no export\@$ip "/export;/quit" 2> errors.log >> $name.export

done < iplistandnamefile

The problem is that the script will work for only the 1st IP address on the iplistandnamefile file but will not loop to the 2nd IP.

Any suggestions ?

The while loop works fine, am not sure of the syntax of the sshpass command, the proper syntax is sshpass -p "pass" ssh -o StrictHostKeyChecking=no user@host command_to_run. What are you trying to achieve with export? — Inian
– Inian, Commented May 6, 2016 at 7:43
the sshpass is working since ive generated an export file for the 1st IP in the list. yah export is the command i want to run. I want to use the while loop so I can use multiple variable when reading the file. Currently I have a working for loop script that reads from a file containing only IP addresses. — John
– John, Commented May 6, 2016 at 8:12

Cwissy · Accepted Answer · 2016-05-06 08:29:11Z

6

ssh is eating the rest of the file as it defaults to reading stdin

add -n to the ssh command.

sshpass -p "pass" ssh -no StrictHostKeyChecking=no user@host command_to_run

answered May 6, 2016 at 8:29

Cwissy

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2 Comments

John Over a year ago

It works.. but i cant fully grasp the function of the -n flag.

Cwissy Over a year ago

-n redirects /dev/null to stdin whereas without it, the whole contents of your file become stdin to ssh

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