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默认初始化文件是:/sbin/init,如果要从 /linuxrc 脚本运行的话需要在内核传递参数里设置 init=/linuxrc (不使用该模式,忽略)
如果不采用 linuxrc 的话就会执行 /sbin/init 脚本,它会去分析 /etc/inittab 脚本: ([color="#000066"]linux inittab详解:http://blog.chinaunix.net/u3/103494/showart_2033153.html)
1) /sbin/init -> /etc/inittab
#id: runlevels: action :process id
:: sysinit: /etc/init.d/rcS
:: respawn: -/bin/sh
console:: askfirst: -/bin/sh
:: ctrlaltdel: /bin/umount -a -r
2)/sbin/init -> /etc/inittab -> /etc/init.d/rcS
#!/bin/sh
echo "===================== /etc/init.d/rcS ================"
echo "export system param...."
export PATH=/sbin:/bin:
export HOSTNAME=micro2440
echo "init ip address....."
/sbin/ifconfig eth0 192.168.254.177
echo "Mount all filesystems (of the given types) mentioned in fstab."
mount -a
3) mount -a 含义为把fstab文件定义的文件系统都做mount处理,fatab:
# device mount-point type options dump fsck order
proc /proc proc defaults 0 0
tmpfs /tmp tmpfs defaults 0 0
sysfs /sys sysfs defaults 0 0
4)/sbin/init -> /etc/inittab -> /etc/profile
# /etc/profile: system-wide .profile file for the Bourne shells
echo "========================= /etc/profile ==========="
PATH=/bin:/sbin:/usr/bin:/usr/sbin
USER="`id -un`"
LOGNAME=$USER
HOSTNAME=`/bin/hostname`
##也许,busybox 1.14.3 是ash,PS1设置不支持PS1='[\u@\h \W]\#'格式;
PS1='[$USER@$HOSTNAME $PWD]#'
export PATH USER LOGNAME HOSTNAME PS1
本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u3/103494/showart_2033163.html |
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