LS
cd
pwd
du -s -h Disk Usage. File size
df disk free -h disk footprint
fdisk
Mount
top / htop + ps + grep + wc + pkill view resource consumption
free
Which
the whereis
Find,
Sed,
the tar,
Touch,
Vim
Tree
Git, MySQL,
the nohup added at the end & provided daemon
sort -r trans, -n value. ordering
date +%Y%m%d_%H%M%S_%N.log
SFTP
scp
sed **** awk
brictl bridge management
curl
the ping
the Telnet
iostat -x 2 io use
nmap host which ports are open
ulimit -a open file limit, etc.