Shell

Create two scripts in the system bin directory, respectively, Pssh tsshPssh#!/usr/bin/expect-fSet IP [lindex$argv 0]set Port [lindex$argv 1]set Password [lindex$argv 2]set TimeoutTenspawn ssh [email protected]$ip-P$portExpect {"*yes/no"{Send "yes\r";

Using Qprocess Qthread============================================#include int main (){Qprocess::execute ("LS");return 0;}============================================ Qprocess *poc = new Qprocess;poc-> Start ("Ping 222.207

Linux Shell View disk partition, memory usage, CPU utilization#!/bin/bash#disk_used_ratelocation=/dev/xvdbdisk_used_rate=$ (df-h | grep $Location | awk ' {print $} ') echo "disk used Ra TE: $Disk _used_rate "#memory_used_rateLoadMemory =$

First, Shell special variables1. Position Variables Positional variables Meaning $ Gets the file name of the currently executing shell script, including the script path $n Gets the nth

Overview:Statement control for Shell scripts-There are three processes in the process programming language mentioned earlier:Sequential execution: Executed in the order of a single statement;Select execution: Select execution according to the

Exercise one: Write a script 1. Set the value of the variable file to/etc/passwd 2. Say hello to each user in/etc/passwd, and say what the ID is like: (Hint: line= ' wc-l/etc/passwd |       Cut-d ""-f1 ') Hello,root,your UID is 0. 3. Count the

The file name of the shell itself $1~ $n Each parameter value added to the shell. $ $ is the 1th parameter, and the $ = is the 2nd parameter ... $$ the shell itself PID (ProcessID) $! PID of the Shell's last running background process $?

What I'm sharing for you is how to use case statements to write some scripts that you choose to execute. Case statements are mainly adapted for use in some complex selection of scripts, if we use if multi-branch statements can also be written out,

One, bash variables:Variable naming laws:1. The reserved words in the program cannot be made: for example if, for;2, only use numbers, letters and underscores, and cannot start with a number3. See the meaning of the name4, the Uniform naming rule:

Types of variables in bash1. Local variable: The active scope is the current shell process and is not valid for Shell processes other than the current shell, including the current Shell's child shell processVariable assignment: name= ' value 'Use

How to let awk use Shell variables under LinuxWhen we write shell scripts, we typically include other small programs or commands in the script, such as awk operations. For awk , we need to find some way to pass some values from the shell to the

First, the concept and characteristics of regular expressions:A regular expression is a logical formula for a string operation, which is to make a "rule string" with a predefined set of characters and a combination of those specific characters.This "

ObjectiveWhat the hell is a shell? Before this, we should understand the issue of file permissionsBody Shell versionVarious versions: Bourne Shell (SH), C Shell (CSH), and Korn Shell (Ksh)And at present:The common and CentOS default

#!/bin/bash#by lc at 20160428 for hadoop (grep_recharge) DATE= ' Date +%F_%H\:%M\:%S ' ytdate= ' date -d  " -1 day"  +%y%m%d ' restdir=/home/hadoop/prodata/restdatedir=/home/hadoop/ prodata/rest/$YTDATERESTFILE =${datedir}/recharge-$YTDATE.

GrepIn the past, we used grep to find lines in a file that contained certain strings, such as finding a string in a header file that fits a pattern (pattern), such as finding all strings that conform to the [email protected] pattern (that is, the

Let, (()) and [] perform basic operations in bash, and advanced operations will use expr and BCLet# Let Result=x+ySelf-adding operation# Let X + +Self-decrement operation# Let x--Shorthand form# Let X+=6---Let x=x+6#let x-=6--Let x=x-6[]# y=$[2 + 1]#

the difference between the ' and $ ' ():In Bash, $ () and "(anti-quote) are used for command substitution.Command substitution is similar to variable substitution, which is used to reorganize the command line, complete the command line in quotation

IP independent IP in the specified time of the non-pass IPSquid Statistics method[Email protected] etc]# cut-d ""-f1/usr/local/squid/var/logs/access.log|sort|uniq|wc-l2823When you use awkawk ' {print '} ' |sort|uniq

Set Environment variables:①export variable name = variable Value #设置环境变量② variable name = variable Value #设置环境变量Export variable NameSet #显示当前shell所有变量Env #查看环境变量unset variable name #删除变量Common environment variables:Path variable: Paths to System

1. After installing Spark, enter spark in the bin directory: Bin/spark-shell scala> val textfile = Sc.textfile ("/users/admin/spark/ Spark-1.6.1-bin-hadoop2.6/readme.md ") scala> Textfile.flatmap (_.split (" ")). Filter (!_.isempty). Map ((_,1)).