Shell Programming and Scripting

[code]#!/usr/bin/env ruby
require 'net/smtp'
def send_email(from,to,subject,message,server)
msg =

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Code:

#!/usr/bin/env ruby
require 'net/smtp'
def send_email(from,to,subject,message,server)
    msg = <<-END_OF_MESSAGE
    From: <#{from}>
    To: <#{to}>
    Subject: #{subject}

    #{message}
   END_OF_MESSAGE

   Net::SMTP.start(server) do |smtp|
   smtp.send_message msg, from, to
   end
end

threshold=80
df=`df -H`
msg=[]
df.split("\n").each do|s|
  s=s.split
  cap=s[4].to_i
  filesystem=s[0]
  if cap >= threshold
    msg<<"#{filesystem}: #{cap}"
  end
end
if msg.size>1
 send_email("root@localhost","root","Alert","#{msg.join("\n")}","localhost")
end

We got the "df -H" , but you posted "df -h" not "df -k". When we have a script which is not working we like to see what the output from the key commands in the script looks like.
Also what do you want the final output of the script to look like?

Btw. If you have "df -P" on your system, just use cfajohnson's post .


@DGPickett . This is clearly not HP-UX (because "df -H" is not valid), but we don't know yet what O/S it is.

df -P is standard (POSIX).

@cfajohnson
Though not the first time I have seen "df -P", it is very rarely used in day-today scripting because of the units. The percentage used figure is good and all we needed for this exercise.
The syntax is not valid in umpteen versions of unix, though we can deduce that the O/P has a modern one which may well offer a POSIX compliant "df" option. Whether the POSIX version is called "df" or "bdf" is a matter for the standards people.


@DGPickett
You may find that issuing "df" commands as a non-root user gives you a different view of free space.

What units? The -P option doesn't change the units.

When scripting, one should always use the -P option, otherwise parsing the output is much harder.

I doubt that there are any modern Unixes in which is is not valid. Can you name one?

The POSIX version is called df.