03-21-2002
mathematics in shell script
Hi Friends,
I am new to shell scripting and a trying to work this out.
I have a variable called $number.
The value in this variable is 10
I want to display $number - 2 in a mail. The result would be 8
eg.
mail -s 'subject' user <<eof
the result of your calculation is $number - 2
eof
I should be mailed :
the result of your calculation is 8
can someone please give me the syntax.
likewise, I would like to know how to do it with echo
echo $number -2
8
Thanks in advance
Suresh
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LEARN ABOUT LINUX
pam_mail
PAM_MAIL(8) Linux-PAM Manual PAM_MAIL(8)
NAME
pam_mail - Inform about available mail
SYNOPSIS
pam_mail.so [close] [debug] [dir=maildir] [empty] [hash=count] [noenv] [nopen] [quiet] [standard]
DESCRIPTION
The pam_mail PAM module provides the "you have new mail" service to the user. It can be plugged into any application that has credential or
session hooks. It gives a single message indicating the newness of any mail it finds in the user's mail folder. This module also sets the
PAM environment variable, MAIL, to the user's mail directory.
If the mail spool file (be it /var/mail/$USER or a pathname given with the dir= parameter) is a directory then pam_mail assumes it is in
the Maildir format.
OPTIONS
close
Indicate if the user has any mail also on logout.
debug
Print debug information.
dir=maildir
Look for the users' mail in an alternative location defined by maildir/<login>. The default location for mail is /var/mail/<login>.
Note, if the supplied maildir is prefixed by a '~', the directory is interpreted as indicating a file in the user's home directory.
empty
Also print message if user has no mail.
hash=count
Mail directory hash depth. For example, a hashcount of 2 would make the mail file be /var/spool/mail/u/s/user.
noenv
Do not set the MAIL environment variable.
nopen
Don't print any mail information on login. This flag is useful to get the MAIL environment variable set, but to not display any
information about it.
quiet
Only report when there is new mail.
standard
Old style "You have..." format which doesn't show the mail spool being used. This also implies "empty".
MODULE TYPES PROVIDED
The session and auth (on establishment and deletion of credentials) module types are provided.
RETURN VALUES
PAM_BUF_ERR
Memory buffer error.
PAM_SERVICE_ERR
Badly formed arguments.
PAM_SUCCESS
Success.
PAM_USER_UNKNOWN
User not known.
EXAMPLES
Add the following line to /etc/pam.d/login to indicate that the user has new mail when they login to the system.
session optional pam_mail.so standard
SEE ALSO
pam.conf(5), pam.d(5), pam(7)
AUTHOR
pam_mail was written by Andrew G. Morgan <morgan@kernel.org>.
Linux-PAM Manual 06/04/2011 PAM_MAIL(8)