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#!/bin/bash
function ip-address() {
# Loop through the interfaces and check for the interface that is up.
for file in /sys/class/net/*; do
iface=$(basename $file);
read status < $file/operstate;
[ "$status" == "up" ] && ip addr show $iface | awk '/inet /{printf $2" "}'
done
}
function memory-usage() {
if [ "$(which bc)" ]; then
# Display used, total, and percentage of memory using the free command.
read used total <<< $(free -m | awk '/Mem/{printf $2" "$3}')
# Calculate the percentage of memory used with bc.
percent=$(bc -l <<< "100 * $total / $used")
# Feed the variables into awk and print the values with formating.
awk -v u=$used -v t=$total -v p=$percent 'BEGIN {printf "%sMi/%sMi %.1f% ", t, u, p}'
fi
}
function vpn-connection() {
# Check for tun0 interface.
[ -d /sys/class/net/tun0 ] && printf "%s " 'VPN*'
}
function main() {
# Comment out any function you do not need.
ip-address
memory-usage
vpn-connection
}
# Calling the main function which will call the other functions.
main
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