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If you start by waiting 10 minutes, it is normal that the mail get sent after this duration ;)

while :
do
ping 192.168.1.254 -c 1
while [ $? -ne 0 ] ; do
ping 192.168.1.254 -c 1
done
echo...

Forget the /, that's part of the filename.

The important thing is the dot (.), or you can use the word source, if you prefer.

From the bash man-page:

. filename [arguments]
...