Shell

The essential point in programming is debugging, Shell script with its powerful function is desirable, of course, its powerful is not only embodied in the language of the implementation function, more powerful is its debugging function, below, I

What is login Shell: Login shell can be used by user login, such as/bin/bash,/bin/sh,/bin/csh ... The general Linux Default User shell is bash, which means you can log in and write commands. Non-logon shell: The classic/bin/nologin is a non-login

These two days, because the work needs to do some of the process of work, look at some of the online examples, mostly through the way of pipeline files to achieve, and then think about it without so much trouble ... The following is a simple

Linux CentOS Shell display-bash-4.1$ does not display the user name path solution Problem Description: CentOS A new user, log in after the information of the shell script is as follows: Rather than the combination of username@hostname we

Lattice, as follows: The code is as follows [root@myvps1697 201407]# netstat-ntpl|grep sshd|grep-v grep |awk-f: ' {print $} ' In order to solve the problem of space, the 3 of my group have asked all the time, now I know how powerful people, a lot

#!/bin/bash #=============================================== # AUTHOR:JC # Email : jiechao2013@gmail.com # changelog:2013.5.4 # Description:check the Cpu-utili Zation rate #=============================================== state_ok=0 state_warning=1

In the process of database operation, the Shell script provides great convenience for operation and maintenance. A shell script parameter passed as a variable to SQL and a SQL script is one of the scenarios that DBAs often encounter. This article

Write a script: 1. Use function to realize: To determine whether a user exists, the user name passed through the parameters; If present, the shell and UID of this user are displayed If it does not exist, it is said that the user does not exist;

What is a shell? The Shell is an interface between the operating system and the user that interprets the commands the user emits, launches the application, and manages the user data with system features. The shell can run multiple processes

If you need to get the full path of a selected file, little brother often mechanically copied the path in the shell window, then copied the file name and spelled it after the path. Sometimes the file path is copied for use by the program, which

Job 3: Requirements are as follows: Write a script: 1, create a function, you can accept a disk device path (such as/DEV/SDB) as a parameter, before really start the next step to remind users of the risk, and let the user choose whether to

The size of the log is very large, the server is generally Linux, HP, AIX, and so on, every time the download back to the trouble of the deadly, in the open source China to see the following content, very practical. 1. Use the Find and Xargs

Loop of shell scripts: repeating commands1.for CycleGrammar:For variable name in variable Value listDoCommandDoneFor based on the contents of the variable Value list, executes the command repeatedly until all the contents of the Variable Value

Special characters:#！ Sign of the beginning; Delimiters with multiple commands together[Email protected] log]# echo A;echo b;echo CABC. Multiple functions:1. Equivalent to the source command2. As part of the file name (hide filename) (use ls-a to

Shell Basics (i)* represents 0 or more arbitrary characters? represents an arbitrary character# Comment symbol, comment description meaning, that is, the content behind the # Linux ignored, or in the shell script to explain the symbol, explain the

String interception from the original address: http://www.jb51.net/article/56563.htmOne: string interceptionThere are VAR variables:var=http://www.aaa.com/123.htm1. # Intercept, delete the left character, leave the right character.echo ${var#*//}Www.

Example 1:[email protected] opt]# cat a.sh #!/bin/bashsource/opt/b.txtaa=${!1}echo $AA [[email protected] opt]# cat B.txt Abc=1[[em AIL protected] opt]# sh a.sh ABC1Example 2:[email protected] opt]# cat a.sh #!/bin/basha=1b=aecho ${b}echo ${!b}eval

The next best thing to do on a virtual machine: Docker is the most convenient1. Installing RpmbuildYum-y Install Rpmbuild rpmdevtools-y2. Generate a package pathWith Rpmdev-setuptree, a Rpmbuild folder is automatically generated in the user's home

The IF function in the shell is beyond doubt that every 80% of the shells will be applied to if judgment, then as a novice I should be the whole, I heard a morning class today, and then the morning's things summed up a script, and then to the people

Delete ${varname#strmatch}//Match the Strmatch from scratch in varname and then remove the position from the beginning to the first match ${varname# #strMatch}//Match the Strmatch from scratch in varname and then delete the position