extract average time from ping -c

One way is to just add a cut to what you have there.

ping -c 4 www.stackoverflow.com | tail -1| awk '{print $4}' | cut -d '/' -f 2

This might work for you:

ping -c 4 www.stackoverflow.com | sed '$!d;s|.*/\([0-9.]*\)/.*|\1|'

The following solution uses Bash only (requires Bash 3):

[[ $(ping -q -c 4 www.example.com) =~ \ =\ [^/]*/([0-9]+\.[0-9]+).*ms ]] \
&& echo ${BASH_REMATCH[1]}

For the regular expression it's easier to read (and handle) if it is stored in a variable:

regex='= [^/]*/([0-9]+\.[0-9]+).*ms'
[[ $(ping -q -c 4 www.example.com) =~ $regex ]] && echo ${BASH_REMATCH[1]}

ping -c 4 www.stackoverflow.com | tail -1| awk -F '/' '{print $5}' would work fine.

"-F" option is used to specify the field separator.

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