7/28 Linux 課

-SFTP/ssh
-echo
-$PATH, command execution is according to the command path order defined in $PATH
-all services are under dir /etc/init.d
-./ssh {stop|start|restart}
-use 'netstat -l' to see all running services
-export/set $PATH
-chown
-rc.local: last executed after machine power-on
-/etc/bash.bashrc: executed after any user log-in
-~/.bashrc: executed after the corresponding user log-in
-alias
-joe:text editor
-dd: file content copy
-free -tm: check memory usage