Shell

#!/bin/bash tput civis while [ 1 ] do    tput clear    tput cup 3 10    tput setb 0    tput setf 2    echo -e "\e[1;32m$(date "+%Y-%m-%d %H:%M:%S  %A")\e[0m"    sleep 1 done Running in Xshell will have splash screen,

Single-branch if statement: If condition test actionThenCommand SequenceFi Example: Determine if the mount point directory exists, or create a new directory if it does not exist. [email protected] script]# cat chkmountdir.sh#!

#!/bin/bash# Test color for scriptred_color= ' \e[1;31m 'green_color= ' \e[1;32m 'yellor_color= ' \e[1;33m 'blue_color= ' \e[1;34m 'pink= ' \e[1;35m 'res= ' \e[0m 'if [$#-eq 2] Thenecho "Usage: ' basename $ ' content {Red|blue|yellow|pink|res|green}"

NMap, also known as Network Mapper, is the Web scanning and sniffing Toolkit under Linux, which has three basic functions, one is to detect whether a group of hosts are online, the second is to scan host ports, to sniff out network services, and to

(a) Conditions to determine if the meaning of-Z to-D[-A file] is true if file exists.[-B file] True if file exists and is a block special file.[-C file] True if file exists and is a special file of a word .　　[-D file] True if file exists and is a

This article is part of the Linux Shell Series Tutorial (10), more Linux shell tutorials: Linux Shell Tutorials Basically any language has its own looping statements, of course, the shell is no exception, today we introduce the use of shell for

How the Linux shell commands work:Linux is strictly speaking of an operating system, we call it "core (kernel)", but we generally users, cannot directly use kernel. Instead, it communicates with kernel through kernel's "shell" program, the so-called

Original address: http://www.cuiweiyou.com/1405.html0.shell[Email protected]:~# Hadoop Fsusage:hadoop fs [generic options] [-appendtofile ... ] [-cat [-IGNORECRC] ...] [-checksum ...] [-CHGRP [-R] GROUP PATH ...] [-chmod [-R] PATH ...] [-chown

The shell is a scripting language, so you have to have an interpreter to execute the scripts.The common shell scripting interpreters on Unix/linux include bash, sh, csh, Ksh, and so on, which are used to call them a shell. we often say that there

This article takes the shell from getting started to giving up the first stepThus, continue from small white to give up the second part of @[email protected] First, the shell operator The shell supports a number of operators, including:

A sample shell script:Gets all file names, paths, and file sizes under the directory (including subdirectories).Code, Shell script: lsdir.sh#!/bin/bash# #site: www.jquerycn.cnfunction ergodic () { forFileinch' LS $1` Do if[-D $1"/"$file] then

Using the shell module, the remote command is executed through/bin/sh, so we can use the various command methods in the terminal input;But we define our own environment variables in. Bashrc/.bash_profile The shell module is not recognized because it

Shuffle question: Wash a pair of poker, what good way? Can be washed evenly, and can wash fast? How efficient is the order of chaos relative to a file?Chinaunix is really a place where the Shell masters are gathered, so long as you want to get the

This article is part of the article "writing a Shell" series. In the previous article, we have completed the first step of our shell: the shell prompt. In this article, we begin to enable our Shell to start reading commands, and to do simple

Direct run will show time[Email protected] shell]# Datesat APR 12:56:47 CST 2016View Calendar[[email protected] shell]# cal April 2016Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 910 11 12 13 14 15 1617 18 19 20 21 22 2324 25 26 27 28 29 30View a full year[[

Suppose we define a variable as:File=/dir1/dir2/dir3/my.file.txtWe can replace each other with ${} to get different values:${file#*/}: Take out the first/its left string: dir1/dir2/dir3/my.file.txt${file##*/}: Take out the last/and left string:

IntroductionOften need to deal with shell commands, but there has been no systematic learning, then it will take 1-2 months to learn the shell command system, then open the magical journey of the shell command. This chapter focuses on the print

Method One of the $ expr length "Find out the length of this string from the Linux Bash shell." 57 Method Two Str1=aaaaaaaaaecho ${#str1}Echo-n xxxxx |wc-cecho Xxxx|awk ' {print length ($)} 'echo "$str" |awk ' {print length ($)} 'awk ' {$a =length ($

This article is part (vi) of the Linux Shell Series tutorial, more on the Shell Tutorial: Linux Shell Series Tutorials The shell is very powerful in programming, its array function is also very perfect, today we introduce the use of the shell

1. IntroductionSometimes when we run Java programs on Linux, we need to invoke some shell commands and scripts. The Runtime.getruntime (). Exec () method provides us with this functionality, and Runtime.getruntime () provides us with the following