concatenate hostname with a string in AIX

Question

I have written a shell script that will trigger a mail using sendmail command in aix . But I want the sender to by root@myhostname.com .

This is my script :

# cat mail1.sh
sendmail -t -F 'Root ' -f 'Root@`echo `hostname``.com' << test.mail
From: Root <Root@`echo `hostname`.com>
To: abc@xyz.com
Subject:Password Expiry
Hi,

Root Users's Password will expire in $1 days
Consider changing it soon.


Regards
System

I want sender to be for example root@'hostname'.com

Answer 1

• Assign the values to shell variables. It makes interpolation cleaner.

• end "here documents" (<<MXXX)

• use -i sendmail command line option

• separate email email headers an body with empty line

Modified script:

HOSTNAME=`hostname`
SENDER="Root@${HOSTNAME}.com"
RECIPIENT="abc@xyz.com"

sendmail -t -i -f${SENDER} <<TEST_MAIL
From: Root <${SENDER}>
To: <${RECIPIENT}>
Subject:Password Expiry

Hi,

Root Users's Password will expire in $1 days
Consider changing it soon.


Regards
System
TEST_MAIL