BusyBox v1.20.0命令介绍（四）

151. swapon – 交换区设置

root@android:/ # busybox-smp swapon --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: swapon [-a] [-p PRI] [DEVICE]

Start swapping on DEVICE

    -a  Start swapping on all swap devices
    -p PRI  Set swap device priority

152. switch_root – 从initramfs中切换到新根文件系统

root@android:/ # busybox-smp switch_root --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: switch_root [-c /dev/console] NEW_ROOT NEW_INIT [ARGS]

Free initramfs and switch to another root fs:
chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /,
execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint.

    -c DEV  Reopen stdio to DEV after switch

153. sysctl – 在运行态配置内核参数[★★★]

root@android:/ # busybox-smp sysctl --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: sysctl [OPTIONS] [VALUE]...

Configure kernel parameters at runtime

    -n  Don't print key names
    -e  Don't warn about unknown keys
    -w  Change sysctl setting
    -p FILE Load sysctl settings from FILE (default /etc/sysctl.conf)
    -a  Display all values
    -A  Display all values in table form

154. syslogd – 系统日志工具[★★]

root@android:/ # busybox-smp syslogd --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: syslogd [OPTIONS]

System logging utility

    -n      Run in foreground
    -O FILE     Log to FILE (default:/var/log/messages)
    -l N        Log only messages more urgent than prio N (1-8)
    -S      Smaller output
    -s SIZE     Max size (KB) before rotation (default:200KB, 0=off)
    -b N        N rotated logs to keep (default:1, max=99, 0=purge)
    -R HOST[:PORT]  Log to IP or hostname on PORT (default PORT=514/UDP)
    -L      Log locally and via network (default is network only if -R)
    -D      Drop duplicates
    -C[size_kb] Log to shared mem buffer (use logread to read it)
    -f FILE     Use FILE as config (default:/etc/syslog.conf)

155. tac – 与cat相反，逆序输出字符

root@android:/ # busybox-smp tac --help 
// http://codingstandards.iteye.com/blog/830800
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: tac [FILE]...

Concatenate FILEs and print them in reverse

156. tcpsvd – 创建TCP连接/监听并用指定程序处理[★★]

root@android:/ # busybox-smp tcpsvd --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: tcpsvd [-hEv] [-c N] [-C N[:MSG]] [-b N] [-u USER] [-l NAME] IP PORT PROG

Create TCP socket, bind to IP:PORT and listen
for incoming connection. Run PROG for each connection.

    IP      IP to listen on, 0 = all
    PORT        Port to listen on
    PROG ARGS   Program to run
    -l NAME     Local hostname (else looks up local hostname in DNS)
    -u USER[:GRP]   Change to user/group after bind
    -c N        Handle up to N connections simultaneously
    -b N        Allow a backlog of approximately N TCP SYNs
    -C N[:MSG]  Allow only up to N connections from the same IP
            New connections from this IP address are closed
            immediately. MSG is written to the peer before close
    -h      Look up peer's hostname
    -E      Don't set up environment variables
    -v      Verbose

157. tee – 将标准输入同步输出到文件，可做日志记录[★★]

root@android:/ # busybox-smp tee --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: tee [-ai] [FILE]...

Copy stdin to each FILE, and also to stdout

    -a  Append to the given FILEs, don't overwrite
    -i  Ignore interrupt signals (SIGINT)

158. telnetd – telnet服务端[★★]

root@android:/ # busybox-smp telnetd --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: telnetd [OPTIONS]

Handle incoming telnet connections

    -l LOGIN    Exec LOGIN on connect
    -f ISSUE_FILE   Display ISSUE_FILE instead of /etc/issue
    -K      Close connection as soon as login exits
            (normally wait until all programs close slave pty)
    -p PORT     Port to listen on
    -b ADDR[:PORT]  Address to bind to
    -F      Run in foreground
    -i      Inetd mode
    -w SEC      Inetd 'wait' mode, linger time SEC
    -S      Log to syslog (implied by -i or without -F and -w)

159. tftpd – tftp服务端[★★]

root@android:/ # busybox-smp tftpd --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: tftpd [-cr] [-u USER] [DIR]

Transfer a file on tftp client's request

tftpd should be used as an inetd service.
tftpd's line for inetd.conf:
    69 dgram udp nowait root tftpd tftpd -l /files/to/serve
It also can be ran from udpsvd:
    udpsvd -vE 0.0.0.0 69 tftpd /files/to/serve

    -r  Prohibit upload
    -c  Allow file creation via upload
    -u  Access files as USER
    -l  Log to syslog (inetd mode requires this)

160. tr – 对来自标准输入的字符进行替换、压缩和删除

root@android:/ # busybox-smp tr --help
// http://man.linuxde.net/tr
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: tr [-cds] STRING1 [STRING2]

Translate, squeeze, or delete characters from stdin, writing to stdout

    -c  Take complement of STRING1
    -d  Delete input characters coded STRING1
    -s  Squeeze multiple output characters of STRING2 into one character

161. traceroute – 追踪数据包在网络上的传输时的全部路径[★★]

root@android:/ # busybox-smp traceroute --help 
// http://man.linuxde.net/traceroute
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: traceroute [-46FIldnrv] [-f 1ST_TTL] [-m MAXTTL] [-p PORT] [-q PROBES]
    [-s SRC_IP] [-t TOS] [-w WAIT_SEC] [-g GATEWAY] [-i IFACE]
    [-z PAUSE_MSEC] HOST [BYTES]

Trace the route to HOST

    -4,-6   Force IP or IPv6 name resolution
    -F  Set the don't fragment bit
    -I  Use ICMP ECHO instead of UDP datagrams
    -l  Display the TTL value of the returned packet
    -d  Set SO_DEBUG options to socket
    -n  Print numeric addresses
    -r  Bypass routing tables, send directly to HOST
    -v  Verbose
    -m  Max time-to-live (max number of hops)
    -p  Base UDP port number used in probes
        (default 33434)
    -q  Number of probes per TTL (default 3)
    -s  IP address to use as the source address
    -t  Type-of-service in probe packets (default 0)
    -w  Time in seconds to wait for a response (default 3)
    -g  Loose source route gateway (8 max)

162. true – 返回真值

root@android:/ # busybox-smp true --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: true 

Return an exit code of TRUE (0)

163. tty – 返回当前终端的名称[★]

root@android:/ # busybox-smp tty --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: tty 

Print file name of stdin's terminal

    -s  Print nothing, only return exit status

root@android:/ # tty 
/dev/pts/1

164. ttysize – 打印终端的位置坐标

root@android:/ # busybox-smp ttysize --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: ttysize [w] [h]

Print dimension(s) of stdin's terminal, on error return 80x25

165. tunctl – 创建和配置虚拟网卡

root@android:/ # busybox-smp tunctl --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: tunctl [-f device] ([-t name] | -d name) [-u owner] [-g group] [-b]

Create or delete tun interfaces

    -f name     tun device (/dev/net/tun)
    -t name     Create iface 'name'
    -d name     Delete iface 'name'
    -u owner    Set iface owner
    -g group    Set iface group
    -b      Brief output

166. udhcpc – DHCP客户端[★]

root@android:/ # busybox-smp udhcpc --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: udhcpc [-fbnqvoCRB] [-i IFACE] [-r IP] [-s PROG] [-p PIDFILE]
    [-V VENDOR] [-x OPT:VAL]... [-O OPT]...

    -i,--interface IFACE    Interface to use (default eth0)
    -p,--pidfile FILE   Create pidfile
    -s,--script PROG    Run PROG at DHCP events (default /usr/share/udhcpc/default.script)
    -B,--broadcast      Request broadcast replies
    -t,--retries N      Send up to N discover packets
    -T,--timeout N      Pause between packets (default 3 seconds)
    -A,--tryagain N     Wait N seconds after failure (default 20)
    -f,--foreground     Run in foreground
    -b,--background     Background if lease is not obtained
    -n,--now        Exit if lease is not obtained
    -q,--quit       Exit after obtaining lease
    -R,--release        Release IP on exit
    -S,--syslog     Log to syslog too
    -a,--arping     Use arping to validate offered address
    -O,--request-option OPT Request option OPT from server (cumulative)
    -o,--no-default-options Don't request any options (unless -O is given)
    -r,--request IP     Request this IP address
    -x OPT:VAL      Include option OPT in sent packets (cumulative)
                Examples of string, numeric, and hex byte opts:
                -x hostname:bbox - option 12
                -x lease:3600 - option 51 (lease time)
                -x 0x3d:0100BEEFC0FFEE - option 61 (client id)
    -F,--fqdn NAME      Ask server to update DNS mapping for NAME
    -V,--vendorclass VENDOR Vendor identifier (default 'udhcp VERSION')
    -C,--clientid-none  Don't send MAC as client identifier
    -v          Verbose
Signals:
    USR1    Renew lease
    USR2    Release lease

167. udpsvd – 创建监听UDP连接并用指定程序处理[★★]

root@android:/ # busybox-smp udpsvd --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: udpsvd [-hEv] [-c N] [-u USER] [-l NAME] IP PORT PROG

Create UDP socket, bind to IP:PORT and wait
for incoming packets. Run PROG for each packet,
redirecting all further packets with same peer ip:port to it.

    IP      IP to listen on, 0 = all
    PORT        Port to listen on
    PROG ARGS   Program to run
    -l NAME     Local hostname (else looks up local hostname in DNS)
    -u USER[:GRP]   Change to user/group after bind
    -c N        Handle up to N connections simultaneously
    -h      Look up peer's hostname
    -E      Don't set up environment variables
    -v      Verbose

168. unexpand – 将给定文件中的空白字符转换为制表符

root@android:/ # busybox-smp unexpand --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: unexpand [-fa][-t N] [FILE]...

Convert spaces to tabs, writing to stdout

    -a,--all    Convert all blanks
    -f,--first-only Convert only leading blanks
    -t,--tabs=N Tabstops every N chars

169. uniq – 报告或忽略文件中的重复行

// http://man.linuxde.net/uniq
root@android:/ # busybox-smp uniq --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: uniq [-cdu][-f,s,w N] [INPUT [OUTPUT]]

Discard duplicate lines

    -c  Prefix lines by the number of occurrences
    -d  Only print duplicate lines
    -u  Only print unique lines
    -f N    Skip first N fields
    -s N    Skip first N chars (after any skipped fields)
    -w N    Compare N characters in line

170. unix2dos – dos/unix文本编码转换[★★]

root@android:/ # busybox-smp unix2dos --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: unix2dos [-ud] [FILE]

Convert FILE in-place from Unix to DOS format.
When no file is given, use stdin/stdout.

    -u  dos2unix
    -d  unix2dos

171. uptime – 显示开机时间

root@android:/ # busybox-smp uptime --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: uptime 

Display the time since the last boot

172. users – 打印当前登陆用户[★]

root@android:/ # busybox-smp users --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: users 

Print the users currently logged on

173. uudecode – 将 uuencode 编码后的档案还原

root@android:/ # busybox-smp uudecode --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: uudecode [-o OUTFILE] [INFILE]

Uudecode a file
Finds OUTFILE in uuencoded source unless -o is given

174. uuencode – uuencode 编码档案

root@android:/ # busybox-smp uuencode --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: uuencode [-m] [FILE] STORED_FILENAME

Uuencode FILE (or stdin) to stdout

    -m  Use base64 encoding per RFC1521

175. vconfig – 创建/删除虚拟网卡设备

root@android:/ # busybox-smp vconfig --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: vconfig COMMAND [OPTIONS]

Create and remove virtual ethernet devices

    add     IFACE VLAN_ID
    rem     VLAN_NAME
    set_flag    IFACE 0|1 VLAN_QOS
    set_egress_map  VLAN_NAME SKB_PRIO VLAN_QOS
    set_ingress_map VLAN_NAME SKB_PRIO VLAN_QOS
    set_name_type   NAME_TYPE

176. vlock – 锁定虚拟终端

root@android:/ # busybox-smp vlock --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: vlock [-a]

Lock a virtual terminal. A password is required to unlock.

    -a  Lock all VTs

177. volname – 显示指定的“ISO-9660”格式的设备的卷名称

root@android:/ # busybox-smp volname --help 
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: volname [DEVICE]

Show CD volume name of the DEVICE (default /dev/cdrom)

178. wall – 消息广播[★]

root@android:/ # busybox-smp wall --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: wall [FILE]

Write content of FILE or stdin to all logged-in users

179. watch – 定期运行指定程序

root@android:/ # busybox-smp watch --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: watch [-n SEC] [-t] PROG ARGS

Run PROG periodically

    -n  Loop period in seconds (default 2)
    -t  Don't print header

180. watchdog – 周期写看门狗设备

root@android:/ # busybox-smp watchdog --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: watchdog [-t N[ms]] [-T N[ms]] [-F] DEV

Periodically write to watchdog device DEV

    -T N    Reboot after N seconds if not reset (default 60)
    -t N    Reset every N seconds (default 30)
    -F  Run in foreground

Use 500ms to specify period in milliseconds

181. wget – 下载命令[★]

root@android:/ # busybox-smp wget --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: wget [-c|--continue] [-s|--spider] [-q|--quiet] [-O|--output-document FILE]
    [--header 'header: value'] [-Y|--proxy on/off] [-P DIR]
    [--no-check-certificate] [-U|--user-agent AGENT] [-T SEC] URL...

Retrieve files via HTTP or FTP

    -s  Spider mode - only check file existence
    -c  Continue retrieval of aborted transfer
    -q  Quiet
    -P DIR  Save to DIR (default .)
    -T SEC  Network read timeout is SEC seconds
    -O FILE Save to FILE ('-' for stdout)
    -U STR  Use STR for User-Agent header
    -Y  Use proxy ('on' or 'off')

182. which – 定位命令绝对路径[★]

root@android:/ # busybox-smp which --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: which [COMMAND]...

Locate a COMMAND

183. who – 显示当前登陆用户[★]

root@android:/ # busybox-smp who --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: who [-a]

Show who is logged on

    -a  Show all
    -H  Print column headers

184. whois – 查找并显示指定帐号的用户相关信息[★]

root@android:/ # busybox-smp whois –help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: whois [-h SERVER] [-p PORT] NAME…

Query WHOIS info about NAME

-h,-p   Server to query

185. xargs – 传递上个执行结果给后续进程使用[★★★]

root@android:/ # busybox-smp xargs --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: xargs [OPTIONS] [PROG ARGS]

Run PROG on every item given by stdin

    -p  Ask user whether to run each command
    -r  Don't run command if input is empty
    -0  Input is separated by NUL characters
    -t  Print the command on stderr before execution
    -e[STR] STR stops input processing
    -n N    Pass no more than N args to PROG
    -s N    Pass command line of no more than N bytes
    -x  Exit if size is exceeded

186. xz – 解压文件

root@android:/ # busybox-smp xz --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: xz -d [-cf] [FILE]...

Decompress FILE (or stdin)

    -d  Decompress
    -c  Write to stdout
    -f  Force

187. xzcat – 查看压缩包内容

root@android:/ # busybox-smp xzcat --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: xzcat FILE

Decompress to stdout

188. yes – 重复输出字符串

root@android:/ # busybox-smp yes --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: yes [STRING]

Repeatedly output a line with STRING, or 'y'

189. zcat – 查看压缩包内容

root@android:/ # busybox-smp zcat --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: zcat FILE

Decompress to stdout

190. zcip – 管理IPv4本地地址

root@android:/ # busybox-smp zcip --help
BusyBox v1.20.0 (2012-08-22 21:36:24 CDT) multi-call binary.

Usage: zcip [OPTIONS] IFACE SCRIPT

Manage a ZeroConf IPv4 link-local address

    -f      Run in foreground
    -q      Quit after obtaining address
    -r 169.254.x.x  Request this address first
    -v      Verbose

With no -q, runs continuously monitoring for ARP conflicts,
exits only on I/O errors (link down etc)

后记

root@android:/ # ls -lh /system/bin/busybox-smp
-rwxr-xr-x    1 0        2000        1.0M Sep  5  2013 /system/bin/busybox-smp

整体过一遍下来，不得不感慨busybox这把瑞士军刀的厉害，在这么小的体积内蕴含了如此丰富的功能，这应该就是开源的力量吧！

BusyBox v1.20.0命令介绍（四）

151. swapon – 交换区设置

152. switch_root – 从initramfs中切换到新根文件系统

153. sysctl – 在运行态配置内核参数[★★★]

154. syslogd – 系统日志工具[★★]

155. tac – 与cat相反，逆序输出字符

156. tcpsvd – 创建TCP连接/监听并用指定程序处理[★★]

157. tee – 将标准输入同步输出到文件，可做日志记录[★★]

158. telnetd – telnet服务端[★★]

159. tftpd – tftp服务端[★★]

160. tr – 对来自标准输入的字符进行替换、压缩和删除

161. traceroute – 追踪数据包在网络上的传输时的全部路径[★★]

162. true – 返回真值

163. tty – 返回当前终端的名称[★]

164. ttysize – 打印终端的位置坐标

165. tunctl – 创建和配置虚拟网卡

166. udhcpc – DHCP客户端[★]

167. udpsvd – 创建监听UDP连接并用指定程序处理[★★]

168. unexpand – 将给定文件中的空白字符转换为制表符

169. uniq – 报告或忽略文件中的重复行

170. unix2dos – dos/unix文本编码转换[★★]

171. uptime – 显示开机时间

172. users – 打印当前登陆用户[★]

173. uudecode – 将 uuencode 编码后的档案还原

174. uuencode – uuencode 编码档案

175. vconfig – 创建/删除虚拟网卡设备

176. vlock – 锁定虚拟终端

177. volname – 显示指定的“ISO-9660”格式的设备的卷名称

178. wall – 消息广播[★]

179. watch – 定期运行指定程序

180. watchdog – 周期写看门狗设备

181. wget – 下载命令[★]

182. which – 定位命令绝对路径[★]

183. who – 显示当前登陆用户[★]

184. whois – 查找并显示指定帐号的用户相关信息[★]

185. xargs – 传递上个执行结果给后续进程使用[★★★]

186. xz – 解压文件

187. xzcat – 查看压缩包内容

188. yes – 重复输出字符串

189. zcat – 查看压缩包内容

190. zcip – 管理IPv4本地地址

后记

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