Linux Basics
Linux common commands
System Security: sudo su chmod setfacl
Process Management: w top ps kill pkill pstree killall
User Management: id usermod useradd groupadd userdel
File system: mount umount fsck df du
System shutdown and reboot: shutdown reboot
Network Application: curl telnet mail elinks
Network Test: ping netstat host
Network configuration: hostname ifconfig
Common tools: ssh screen clear who date
Package Management: yum rpm apt-get
Find and compare files: locate find
Check file contents: head tail less more
File: touch unlink rename Ln cat
Directory operations: cd mv rm pwd tree cp ls
File permissions attributes: setfacl chmod chown chgrp
Compression / decompression: bzip2 / bunzip2 gzip / bunzip zip / unzip tar
File transfer: ftp scp
System timing tasks
crontab command
crontab -e
* * * * * (Timeshare weeks sun and the moon)
at the command
at 2:00 tomorrow
vi / vim
General mode, edit mode, command line mode
General mode: Delete, Copy, Paste
Edit mode switching: i I o O a A r R