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Creating links to files and directories in unix centos vps
Creating a link to a directory It is often useful to change to another directory without typing its full pathname: symbolic links provide a useful shortcut to do this. A symbolic link differs from a...
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JAVA_HOME in windows 7
Windows: The SetX command would do so: setx /M JAVA_HOME “C:\Program Files (x86)\Java\jdk1.6.0_17″ /m means machine level. To check the settings, use “set” command for all the variables. Use “echo...
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copy file through ssh
I use winscp or secure shell client. sftp is (and works) similar to ftp scp is a neat little program: copy from a remote machine to my machine: scp...
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My Basic VI commands
vi filename edit filename starting at line 1 :q<Return> quit (or exit) vi :q! <Return> quit vi even though latest changes have not been saved for this vi call :0<Return> or 1G move...
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verify https connectivity from unix command line
1.For sites using https, normally we can telnet the 443 port. telnet www.somesite 443 2. Use openssl of course. The openssl s_client program works perfectly here: openssl s_client -connect...
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unix privs chmod user group Permissions
Introduction This is a topic that has been beaten to death both in books and on-line. For some reason, it seems that it is one of the most common misunderstandings that people have to face when...
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Ubuntu进入root权限命令——sudo和su命令详解
ubuntu用户管理 sudo 意思就是super-user do，让当前用户暂时以管理员的身份root来执行这条命令。 su (switch user)是用来改变当前用户的，su root，就是将当前用户切换为root，用了su root之后，下面所有的命令就可以不用打sudo了，因为当前用户已经是管理员root了。 root 用户为根用户，也就是 系统管理员 拥有全部权限 一个用户只能拥有一个...
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$# and S* in shell script
From here: $# Stores the number of command-line arguments that were passed to the shell program. $? Stores the exit value of the last command that was executed. $0 Stores the first word of the entered...
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linux/unix SHELL 是什么
shell是你（用户）和Linux（或者更准确的说，是你和Linux内核）之间的接口程序。你在提示符下输入的每个命令都由shell先解释然后传给Linux内核。 ——————————————————————————– 注意: 如果你熟悉ms-dos，你将认出这很象DOS 用户和 COMMAND.COM之间的关系。唯 一的区别是command.com 的功能远不能和shell 相提并论。...
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MY unix commands
tail a file tail -100f FileName -f to allow file monitoring check process ps -f -p ThePID -f full all columns -p by process ID ps -e -f -e all processes if the CMD is very long like running java...
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