...quick and dirty

Change PATH variable

edit /etc/profile Example:

PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/syno/sbin:/usr/syno/bin:/usr/local/sbin:/usr/local/bin:/opt/bin:/opt/sbin

Find all files that contain a specific text

find / -type f -exec grep -H 'text-to-find-here' {} \;
OR
grep -rl "text-to-find-here" /

set route / default gateway

route add default gw YOUR_GW_IP YOUR_EHTERNET_IDENTIFIER
route add default gw 192.168.0.1 eth0

detect your system architecture (hardfloat or softfloat)

dpkg --print-architecture