 1#!/bin/busybox sh
 2
 3# initrd, only busybox and /init
 4BB=/bin/busybox
 5
 6# (1) Print something and exit
 7$BB echo -e "\033[31mHello, OS World\033[0m"
 8$BB poweroff -f
 9
10# (2) Run a shell on the init console
11$BB sh
12
13# (3) Rock'n Roll!
14for cmd in $($BB --list); do
15  $BB ln -s $BB /bin/$cmd
16done
17mkdir -p /tmp
18mkdir -p /proc && mount -t proc  none /proc
19mkdir -p /sys  && mount -t sysfs none /sys
20mknod /dev/tty c 4 1
21setsid /bin/sh /dev/tty 2>&1
22
23# busybox 1.30.1 applets:
24# [ [[ acpid adjtimex ar arch arp arping ash awk basename bc blkdiscard
25# blockdev brctl bunzip2 busybox bzcat bzip2 cal cat chgrp chmod chown chpasswd
26# chroot chvt clear cmp cp cpio crond crontab cttyhack cut date dc dd deallocvt
27# depmod devmem df diff dirname dmesg dnsdomainname dos2unix dpkg dpkg-deb du
28# dumpkmap dumpleases echo ed egrep env expand expr factor fallocate false
29# fatattr fdisk fgrep find fold free freeramdisk fsfreeze fstrim ftpget ftpput
30# getopt getty grep groups gunzip gzip halt head hexdump hostid hostname httpd
31# hwclock i2cdetect i2cdump i2cget i2cset id ifconfig ifdown ifup init insmod
32# ionice ip ipcalc ipneigh kill killall klogd last less link linux32 linux64
33# linuxrc ln loadfont loadkmap logger login logname logread losetup ls lsmod
34# lsscsi lzcat lzma lzop md5sum mdev microcom mkdir mkdosfs mke2fs mkfifo mknod
35# mkpasswd mkswap mktemp modinfo modprobe more mount mt mv nameif nc netstat nl
36# nologin nproc nsenter nslookup nuke od openvt partprobe passwd paste patch
37# pidof ping ping6 pivot_root poweroff printf ps pwd rdate readlink realpath
38# reboot renice reset resume rev rm rmdir rmmod route rpm rpm2cpio run-init
39# run-parts sed seq setkeycodes setpriv setsid sh sha1sum sha256sum sha512sum
40# shred shuf sleep sort ssl_client start-stop-daemon stat static-sh strings
41# stty su sulogin svc svok swapoff swapon switch_root sync sysctl syslogd
42# tac tail tar taskset tc tee telnet telnetd test tftp time timeout top touch
43# tr traceroute traceroute6 true truncate tty tunctl ubirename udhcpc udhcpd
44# uevent umount uname uncompress unexpand uniq unix2dos unlink unlzma unshare
45# unxz unzip uptime usleep uudecode uuencode vconfig vi w watch watchdog wc
46# wget which who whoami xargs xxd xz xzcat yes zcat
16. Linux 操作系统¶

Take-away Messages¶

课后习题/编程作业¶

1. 编程实践¶
