CLI: command Line Interface
命令行界面：现在Linux发行版默认登陆界面几乎都是默认为GUI界面，若按照旧版本的修改inittab文件，在一些内核比较新的版本因Linux启动机制发生变化无inittab配置文件
Debian8 修改启动界面：修改启动程序grub配置文件实现
- 打开grup配置文件：/etc/default/grub
- 修改GRUB_CMDLINE_LINUX="" 为GRUB_CMDLINE_LINUX="text"
- 更新grub:update-grub
- 更新系统服务管理器配置：systemctl set-default multi-user.target
- 重启：init 6(效果)
更新后grub文件
# If you change this file, run 'update-grub' afterwards to update# /boot/grub/grub.cfg.# For full documentation of the options in this file, see:# info -f grub -n 'Simple configuration'GRUB_DEFAULT=0GRUB_TIMEOUT=5GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`GRUB_CMDLINE_LINUX_DEFAULT="quiet"GRUB_CMDLINE_LINUX="text"# Uncomment to enable BadRAM filtering, modify to suit your needs# This works with Linux (no patch required) and with any kernel that obtains# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"# Uncomment to disable graphical terminal (grub-pc only)#GRUB_TERMINAL=console# The resolution used on graphical terminal# note that you can use only modes which your graphic card supports via VBE# you can see them in real GRUB with the command `vbeinfo'#GRUB_GFXMODE=640x480# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux#GRUB_DISABLE_LINUX_UUID=true# Uncomment to disable generation of recovery mode menu entries#GRUB_DISABLE_RECOVERY="true"# Uncomment to get a beep at grub start#GRUB_INIT_TUNE="480 440 1"
解除debian root用户登陆限制
- 打开gdm配置文件：/etc/gdm3/deamon.conf
- 配置安全设置：[security] 下一行添加 "AllowRoot = ture"
- 去除gdm登陆用户名检测：打开文件/etc/pam.d/gdm-autologin，并其相关配置信息删除或注释掉：
auth required pam_succeed_if.so user != root quiet_success
更新后的gdm-autologin文件：
#%PAM-1.0auth requisite pam_nologin.so#auth required pam_succeed_if.so user != root quiet_successauth required pam_permit.so[@include](https://my.oschina.net/JLXINAO) common-account# SELinux needs to be the first session rule. This ensures that any # lingering context has been cleared. Without this it is possible # that a module could execute code in the wrong domain.session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so closesession required pam_loginuid.so# SELinux needs to intervene at login time to ensure that the process# starts in the proper default security context. Only sessions which are# intended to run in the user's context should be run after this.session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so opensession optional pam_keyinit.so force revokesession required pam_limits.sosession required pam_env.so readenv=1session required pam_env.so readenv=1 envfile=/etc/default/locale[@include](https://my.oschina.net/JLXINAO) common-session[@include](https://my.oschina.net/JLXINAO) common-password