2a3
> # For dialup connection, of course.
5a7,12
> SERPORT=ttyS3
> #  Depending on the hardware and even the kernel version,
> #+ the modem port on your machine may be different --
> #+ /dev/ttyS1 or /dev/ttyS2.
> 
> 
9c16
< $killppp                  # This variable is now a command.
---
> $killppp                     # This variable is now a command.
14c21
< chmod 666 /dev/ttyS3      # Restore read+write permissions, or else what?
---
> chmod 666 /dev/$SERPORT      # Restore r+w permissions, or else what?
18,23c25
< rm /var/lock/LCK..ttyS3   # Remove the serial port lock file. Why?
< 
< #  Note:
< #  Depending on the hardware and even the kernel version,
< #+ the modem port on your machine may be different --
< #+ /dev/ttyS1 or /dev/ttyS2.
---
> rm /var/lock/LCK..$SERPORT   # Remove the serial port lock file. Why?
25c27
< exit 0
---
> exit $?