Shell

[Email protected] wyb]#CatTest10.SH #!/bin/bash# using the For loop/test10 directory 10 HTML files are created in bulk by random lowercase 10 letters plus a fixed string Oldboydir=/root/wyb/test10/[ ! -D $dir] &&mkdir-P $dir forIinch`seq Ten` Do

[Email protected] ~]#CatJiechen.SH #!/bin/bash# Design a shell program to calculate the factorial of N, required: #1. Receive parameters from the command line n;#2to determine the legality of n immediately after the commencement of the program, that

I believe that the students running on the path of the script, can feel that the script needs to apply variables in a very wide area, simply to see the variable is simply: var=value; if we go deep into it, we can also find that the knowledge of

   #include   #include  int main () { file *in;  file *out;  char c;   int count=0;    puts (" Please ues  in.txt ")     in= fopen (" In.txt ", " R ");     out = fopen ("OUT.txt",  "W");            while ((C = fgetc (in))  != eof)      {          if

MAPR distributed cluster installation process is still very difficult, far from the simple Plan. I summarize the installation configuration, because the cluster has a lot of machines, manual each configuration is very tired, wrote an automated

Managing Shell JobsWhen moving jobs between the foreground and background, it could be useful to a overview of all current jobs. To get such a overview, use the jobs command. As can see in Table 9.2, this command gives an overview of all jobs

The difference and relation between the inverted quotation mark "" "and the $ ()' $ ' (parameter substitution) and ' ' (Command substitution)The use of the anti-quote "'" and $ () is the same. When executing a command, the statement in the ", or $ ()

In writing shell scripts, we often have to deal with some input parameters, it is more convenient to find getopts in the process, and can handle the parameters and parameter values of user input very well.Getopts is used to process user input

One, shell condition Test man bash//view HelpCommands for conditional testsTest option file name or directory nameOr[option file name or directory name]Cases:[-E/ETC/PASSD]File status-F//judgment is not a file, is the file is True- D//Determine if

One, shell input function1. Keyboard inputWay One:[Email protected] four]#CatTest.SH#!/bin/Bash #-the e parameter resolves the escape character in the statementEcho-E"My name is user1\n my name is User2"#-n parameter allows the echo command to end

variables and environment variablesVar=value assigns a value to the variable, the output statement: $ echo $var or $ echo ${var}, remember that there is a space in the middleFor example: Name= "Coffee" age= "$echo" my name is : ${name}, The age is :

First, bash1.bash is also a program, when is the program called?User login, using the SU command to switch users, directly execute the BASH command will open a new bash, this shell called the child shell, the child shell can not be the same as the

CentOS Shell Programming 3 "alarm system" 37th sessionThe first half of the classThe second half of the classThe entire project does not have any architecture, is single-machine, without the concept of server-side and clientJust a simple call to

There are two ways you can execute shell scripts under Linux:1, execute the script with Shell program: According to the type of your shell script, choose shell Program, commonly have sh,bash,tcsh etc. (generally the first line #!/bin/bash indicates

Linux has three ways to change permissions:chmod/acl/sudo The first two are used to change file permissions,sudo is used for more application or command execution permissions chmod limitation is the inability to achieve multiple

20150913-15 Jobs1. Describe the operation principle of shell program (can be attached with necessary graphic instructions)Shell Script Foundation Advanced (i)----shell introduction2, summarize all the knowledge points involved in shell programming

The purpose of this paper is to review the function, definition, nesting, deletion, terminal call, return value, parameter passing of shell functions.Knowledge Reserve function: That is Functions , a set of independent code modules that

Tag: Shell variable command executes the variable as a commandThe shell will execute the variable when the command executes "multiple commands simultaneously execute the problem"Today, a shell script is written that requires variables to be run as

What I want to say here is a few shell parentheses, braces and parentheses, the use of commands, as follows:1.${var}2.$ (CMD)3. () and {}4.${var:-string},${var:+string},${var:=string},${var:?string}5.$ ((exp))6.$ (Var%pattern), $ (Var%%pattern), $

Variables contain special symbols, plus single quotesMyname= ' Zhu Jiasheng 'The variable itself is enclosed in single quotes, with double quotation marksMyname= "Zhu ' Jia ' shng"Add the contents of other variables, double quotation marks are