第一条指令netstat -v中由于 netstat 命令不包含 -v 参数,命令执行失败,echo $?打印结果为1;第二条指令正确执行,打印结果为0. 1.3 && 运算符 与许多其他语言相似,bash中的&&运算符是具有阻断效果的左侧优先运算符,实现逻辑与操作,即在命令 command01 && command02 中,根据条件满足与否从左往右一次执行 command...
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Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.30.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 0.0.0.0 192.168.30.2 0.0.0.0 UG 0 0 0 eth0 [root@localhost ~]# netstat -o state established '( sport = :22 )' Active Internet connections (w/o servers) ...
This happens, for example, when ifconfig or netstat -i is run. A sample implementation for snull is introduced in "Statistical Information" later in this chapter. int (*set_config)(struct net_device *dev, struct ifmap *map); Changes the interface configuration. This method is the entry ...
英文:network statistics 命令路径:/bin/netstat 执行权限:所有用户 作用:主要用于检测主机的网络配置和状况 -a all显示所有连接和监听端口 -t (tcp)仅显示tcp相关选项 -u (udp)仅显示udp相关选项 -n 使用数字方式显示地址和端口号 -l (listening) 显示监控中的服务器的socket ...
-d –date=STRING:parse STRING and use it instead of use current time -f:ignore -m:change only the modification time -t STAMP:use [YYMMDDhhmm] instead of current time --time=WORD:change specified time :WORD is access,atime,or use:equivalent to -a WORD is modify or mtime:equivalent to...
The above command is the equivalent of: kill-9`pgrepping` Copy If you would like to send a signal to every instance of a certain process, you can use thekillallcommand: killallfirefox Copy The above command will send the TERM signal to every instance offirefoxrunning on the computer. ...
(01..12) %j day of year (001..366) %k hour, space padded ( 0..23); same as %_H %l hour, space padded ( 1..12); same as %_I %m month (01..12) %M minute (00..59) %n a newline %N nanoseconds (000000000..999999999) %p locale's equivalent of either AM or PM; ...
系统级别的工具有vmstat、mpstat、iostat、netstat、sar,这些工具有使用惯例,可选时间间隔和次数。进程级别的工具使用内核为每个进程维护的计数器,有ps、top、pmap。本节主要讲基于计数器的系统级性能工具。 1.1 vmstat vmstat是Virtual Meomory Statistics(虚拟内存统计),用来报告进程、内存、磁盘读写、CPU使用整体状况。
-E END If END occurs as a line of input, the rest of the input is ignored. -e [END], --eof[=END] Equivalent to -E END if END is specified. Otherwise, there is no end-of-file string --help Print a summary of the options to xargs. ...