Introduction

• RHEL(Red Hat Enterprise Linux)

  • Most popular Enterprise Linux distribution.
  • The de facto standard.
  • It's open source.
  • But software updates are available only through a paid subscription service.

• CentOS(Community ENTerprise Operating System) RECOMMENDED

  • Building from the source of RHEL.
  • 100% binary compatibility with RHEL.
  • Free to receive software updates.

Basic

TUI(Text User Interface)

• Terminal
• SSH(Secure SHell), a protocol and also an client/server applications.
• OpenSSH, client and server suite.
• Xshell and Xftp, client suite for windows.

Filesystem

• man hier

Basis

• pwd, display the current diretory.
• ls, list files and diretories under the the current diretory.
• cd, change to the specified diretory.

Configuration

Locale

• LANG, /etc/sysconfig/i18n
• Timezone, /etc/localtime
• Clock, /etc/sysconfig/clock

Hostname

• /etc/sysconfig/network
• /etc/hosts

Network

• Adapter, /etc/sysconfig/network-scripts/ifcfg-ethX
• Route, /etc/sysconfig/network-scripts/route-ethX
• Gateway, /etc/sysconfig/network
• DNS, /etc/resolv.conf

Service

• service daemon_name [start|staus|stop|restart]
• chkconfig --list
• chkconfig daemon_name [on|off]

Cron

• crontab -l, list scheduled tasks.
• crontab -e, edit scheduled tasks.
• /etc/crontab
• /etc/rc.local