Shell

Strings are the most common and useful data types in shell programming (except numbers and strings, and no other type works well), strings can be in single quotes or double quotes, or without quotes. The difference between single and double quotes

Recently in the study of shell programming, idle to do nothing, to engage in a small shell. can be used to detect the surviving host of a network segment.1#!/bin/Bash2 #3#Date: the/ A/ -4#blog: www.cnblogs.com/Outline5 #by: Joe6 7 if[$#-lt1] ; Then8

System Environment centos6.5[Email protected] wang]# uname-r2.6.32-431.el6.i686Official Add Account:[Email protected]/]# Useradd Wang #添加用户wang[[email protected]/]# tail-l/etc/passwd #用tail命令查看passwd文件,-l Display countdown 10 lines[Email protected]/]

First, the questionThe question is simple, look at the following section of tmp.sh code:#!/bin/Shx= "This was theinitial value of x" while a read line; Do x= "$line" = $x/tmp/tmp's Content1,aExecute./tmp.sh, the normal x variable is

X Shell 4 is a good terminal to log into Linux server under Windows, which is more useful than puttyX Shell 4 Below this scenario, I personally likeThe effect of writing shell scripts with vim:Follow these steps to configure:1) Save the following

Use the shortcut keys to reduce the number of mouse clicks, thereby improving efficiency, below is the summary of the Shell shortcut keys:CTRL + A cursor goes to the beginningCtrl+e cursor goes to end of lineCTRL+F cursor moves one character to the

First, the grammar while [Condition] # when the condition condition is established, loop until the condition is not set to stop doing #执行内容done Second, practice Enter the user input parameters until the user enters "end" to end the loop

The du command can view the number of tiles occupied by the specified folder, and the following is the code for the C language implementation of the Shell du Directive under Linux (Support-k option):#include #include #include #include #include

1, first LDD is not an executable program, but just a shell script2, LDD can display the dependency of the executable module, the principle is by setting a series of environment variablesAs follows: Ld_trace_loaded_objects, Ld_warn, Ld_bind_now,

Package com.pms.util;Import Java.io.File;Import java.io.IOException;Import Java.io.InputStream;Import java.util.ArrayList;Import java.util.List;Import Org.apache.commons.logging.Log;Import Org.apache.commons.logging.LogFactory;/*** Execute Linux

[[Email protected] shell] # Cat shift. Sh #! /Bin/bash Until [$ #-EQ 0]; do Echo "the first is: $1 total is $ #" Shift Done [[Email protected] shell] #./shift. Sh 1 2 3 4 5 6 The first is: 1 total is 6 The first is: 2 total is 5 The first

#! /Bin/sh # Determine whether to use a positive or negative number based on the entered number. Path =/bin:/sbin:/usr/bin/:/usr/sbin:/usr/local/bin:/usr/local/sbin :~ /Bin Export path Echo "Enter the number \ n" Read shuzi If [$ shuzi-GE 0];

Method for obtaining the process ID by shell: I know there are three things I have learned and practiced: PS-A | grep "cmdname" | awk '{print $1 }' Pidof "parameter name" Pgrep "cmdname" The three running results in bash and busybox ash

#!/bin/bashDBUSER=‘root‘DBPASS=‘‘DBHOST=‘localhost‘ZBX_VER=‘2.0.1‘function checkReturn {  if [ $1 -ne 0 ]; then     echo "fail: $2"     echo "$3"     exit  else     echo "pass: $2"  fi  sleep 3}cat  /dev/null  /tmp/mytmp393; mv /tmp/mytmp393 /etc/zab

1234567891011121314151617181920212223242526272829303132 [ -a FILE ] IfFILE If yes, it is true.[ -b FILE ] IfFILE If the object exists and is a special file, it is true.[ -c FILE ] IfFILE If a special file exists and is a word, it is

Tag: Please user null Syntax format Function Name (){ Function body } Function Name -------------------------- Function body can contain command loop judgment Example: Determine whether a user exists. The output user ID and shell exist. #!

#! /Bin/bashExport AT1 = "/usr/local/export AT1 /"Tomcat2 = "/usr/local/tomcat2 /"Tomcat3 = "/usr/local/tomcat3 /"Tomcat4 = "/usr/local/tomcat4 /"Tomcat = ($ tomcat1 $ tomcat2 $ tomcat3 $ tomcat4)# For (I = 0; I # $ {Tomcat [$ I]} bin/shutdown.

I recently wrote a shell script, which has high efficiency requirements, so I read some articles. I feel that this article is really good. The example in this article is really great! Institute Use me to extract them: @ 1: instance: Requirement:

Requirement: traverse all APK installation packages and install them in batches. Idea: there should be many ways to implement it, but I am not familiar with shell commands. I chose the simplest one. The find command should be simpler and updated

Linux Command -- bash shell configuration, linuxbash I. shell Type From the perspective of user login, shell types include: 1. logon shell: (read environment configuration) Normally log on through a terminal: Su-USERNAME Su-l USERNAME 2. Non-Logon