chapter1 fixed started script

[ping-jz]

#!/bin/bash
cargo b --release
sudo setcap cap_net_admin=eip ./target/release/tcp
./target/release/tcp & 
pid=$1
sudo ip addr add 192.168.0.1/24 dev tun0
trap "kill $pid" INT TERM
wait $pid

fix pid=$1 to pid=$1, so the pid var is correcly assigned?

#!/bin/bash
cargo b --release
sudo setcap cap_net_admin=eip ./target/release/tcp
./target/release/tcp & 
pid=$!
sudo ip addr add 192.168.0.1/24 dev tun0
trap "kill $pid" INT TERM
wait $pid