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#!/usr/bin/env bash
#
# $Id: mail-attach,v 1.2.2.1 2004-05-21 00:16:36 lsf37 Exp $
# Author: Gerwin Klein, TU Muenchen
#
# DESCRIPTION: send email with text attachments.
# (works for "mail" command of SunOS 5.8)
#

PRG="$(basename "$0")"

MIME_BOUNDARY="==PM_=_37427935"

function usage()
{
  echo
  echo "Usage: $PRG subject recipient <body> [<attachments>]"
  echo
  echo "  Send email with text attachments. <body> is a file."
  echo
  exit 1
}

function fail()
{
  echo "$1" >&2
  exit 2
}

#
# print_attachment <file>
#
# print mime "encoded" <file> to stdout (text/plain, 8bit)
#
function print_attachment()
{
    local FILE=$1
    local NAME=${FILE##*/}

    cat <<EOF
--$MIME_BOUNDARY
Content-Type: text/plain
Content-Transfer-Encoding: 8bit
Content-Disposition: attachment; filename="$NAME"

EOF
    cat $FILE
    echo
}


#
# print_body subject <message-file> [<attachments>]
#
# prints mime "encoded" message with text attachments to stdout
#
function print_body()
{
    local SUBJECT=$1
    local BODY=$2
    shift 2

    cat <<EOF
Subject: $SUBJECT
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="$MIME_BOUNDARY"

--$MIME_BOUNDARY
Content-Type: text/plain
Content-Transfer-Encoding: 8bit

EOF
    cat $BODY
    echo

    for a in $@; do print_attachment $a; done

    echo "--$MIME_BOUNDARY--"
    echo 
}

## main

# argument checking

[ "$1" = "-?" ] && usage
[ "$#" -lt "3" ] && usage

SUBJECT="$1"
TO="$2"
BODY="$3"

shift 3

[ -r "$BODY" ] || fail "could not read $BODY"

print_body "$SUBJECT" "$BODY" $@ | mail -t "$TO"

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