add traceroute.md
add systemctl.md
add journalctl.md
add ip.md
Merge pull request #111 from felixonmars/traceroute

add traceroute.md
fix the example command to match description
Merge pull request #113 from felixonmars/journalctl

add journalctl.md
Merge pull request #112 from felixonmars/systemctl

add systemctl.md
Merge pull request #114 from felixonmars/ip

add ip.md
Added forceful caching (thus added --update flag). Added --random,
--list flags