Linux:-bash: ***: command not found,系统很多命令都用不了,均提示没有此命令. 突然之间linux很多命令都用不了,均提示没有此命令. 这应该是系统环境变量出现了问题导致的. 解决办法: 先用:echo $PATH  查看path是否含有:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin 如果没有 先用临时环境变量(重启后消失)#export PATH=$PATH:/usr/local/sb…

tcpdump command is also called as packet analyzer. tcpdump command will work on most flavors of unix operating system. tcpdump allows us to save the packets that are captured, so that we can use it for future analysis. The saved file can be viewed by…

This Linux tutorial will explain the three "W" commands. The three "W"s are whatis, whereis and which commands. You already know how to use find command to efficiently fo find a file. Now, these three W commands will help you to locate…

1.0.0 Summary Tittle:[Linux]-NO.8.Linux.4.Command.1.001-[Common Command]- Style:Linux Series:Command Since:2017-04-16 End:2017-04-16 Total Hours:ing Degree Of Diffculty:5 Degree Of Mastery:5 Practical Level:5 Desired Goal:5 Archieve Goal:... Gerneral…

learn Linux sed command 一.参考文档: . sed命令详解 http://qifuguang.me/2015/09/21/sed%E5%91%BD%E4%BB%A4%E8%AF%A6%E8%A7%A3/ . linux之sed用法 http://www.cnblogs.com/dong008259/archive/2011/12/07/2279897.html . Sed 的man手册参数详细解释(一) http://blog.csdn.net/imfinger/arti…

Linux cp command All In One $ man cp $ cp -h # 强制 $ cp -f # 递归,复制文件夹 $ cp -r demos cp -fr # ./folder1/ 只复制 folder1 文件夹内的所有文件,到 folder2 下面 $ cp -fr ./folder1/ ./folder2 # ./folder1 复制整个 folder1 文件夹, 到 folder2 下面 $ cp -fr ./folder1 ./folder2 cp multi f…

how to using Linux pipe command output another command's help content to a file Linux tee > >> gcc help $ gcc --help # ??? $ gcc --help | echo > gcc-help.md # output help to a file $ gcc --help > gcc-help.md > && >> # >…

1. uboot command 读取寄存器内容 md [内存地址][长度] 修改内存地址 mw [内存地址][长度] 2. linux络命令  -- netstat -a (all)显示所有选项,默认不显示LISTEN相关-t (tcp)仅显示tcp相关选项-u (udp)仅显示udp相关选项-n 拒绝显示别名,能显示数字的全部转化成数字.-l 仅列出有在 Listen (监听) 的服務状态 -p 显示建立相关链接的程序名-r 显示路由信息,路由表-e 显示扩展信息,例如uid等-s 按各个协…

tcpdump官网:http://www.tcpdump.org/ 转载于:http://www.cnblogs.com/ggjucheng/archive/2012/01/14/2322659.html 简介 用简单的话来定义tcpdump,就是:dump the traffic on a network,根据使用者的定义对网络上的数据包进行截获的包分析工具. tcpdump可以将网络中传送的数据包的"头"完全截获下来提供分析.它支持针对网络层.协议.主机.网络或端口的过滤,并提供a…

Linux command ls basically use the file /etc/DIR_COLORS or /etc/DIR_COLORS.xterm to define the colors used, in terms of different types of terminal windows. You can change the definitions directly in these files to alter the colors to meet your expec…