bash - How can I increment one line at a time from a text file and sed the output to another file? -


i have text file containing, e.g.: 

user0@domain.com user1@domain.com user2@domain.com user3@domain.com

and ssmtp.conf containing:

authuser=user0@domain.com

how can take first line , sed ssmtp.conf end this:

authuser=user1@domain.com

i need sleep few seconds , change 

authuser=user2@domain.com

and forth. currently, of couple users here have:

#!/bin/bash y=4  (( x=1; x<=y; x++ )); emails=`echo  $( cat /home/apx/desktop/emailaddresses.txt | sed -n ''$x''p )` sed -i "/authuser/s/= .*/= $emails/" /etc/ssmtp/ssmtp.conf ssmtp blahh@blahh.com -v < /home/apx/desktop/message.txt sleep 1 done

when run this, cycles through 4 times. each time sends email, sends 4 user0@domain.com rather user0, user1, user2, , user3, i've been struggling achieve. realized not changing @ all. stays way left last. appreciate if me understand i'm doing wrong.

try this:

#! /bin/bash while read -r addr;     sudo m4 -daddr="$addr" >/etc/ssmtp/ssmtp.conf <<<'authuser=addr'     sudo ssmtp blahh@blahh.com -v </home/apx/desktop/message.txt     sleep 1 done </home/apx/desktop/emailaddresses.txt

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