This script dials the built-in Verizon WWAN (mobile broadband) modem on my Thinkpad T61.

#!/bin/bash
#
# Dial the WWAN
#

hang_up () {
    echo 
    echo 'WWAN deactivated'
    echo
    exit
}

trap "hang_up" 2

echo 'Activating WWAN'
sudo modprobe -r airprime usbserial
sudo modprobe usbserial vendor=0x1199 product=0x0220
sudo modprobe airprime
sleep 0.5
sudo wvdial

Often times one uses a single .profile or .bashrc across several hosts. These hosts may be differently configured, with varying directory locations, and different initial PATH values from /etc/profile. In situations like this, setting PATH the traditional way -- "PATH=$PATH:/path/to/some/stuff" -- can result in a cumbersomely long PATH that includes inaccessible or duplicate folders.

The snippet below nicely handles this problem. It has been tested on Solaris and Linux.

AddPath ()
# Add argument to $PATH if:
# - it is not already present
# - it is a directory
# - we have execute permission on it
#
# This snippet is public domain; you may use it freely.  Death to copyright, patents, 
# and all other forms of intellectual monopoly.  
#
{
  _folder=$1
  echo " $PATH " | sed 's/:/ /g' | grep " $_folder " > /dev/null
  [ $? -ne 0 ] && [ -d $_folder ] && [ -x $_folder ] && PATH=$PATH:$_folder
  export PATH
}

# Add some common paths:
AddPath /usr/bin
AddPath /usr/local/bin
AddPath /opt/somepackage/bin