Shell

First timed crawl server JVM related information #! /bin/sh #get_current_time export java_home=/opt/jdk1.6.0_10/ export path= $JAVA _home/bin: $PATH Export classpath=.: $JAVA _home/lib/tools.jar: $JAVA _home/lib/dt.jar: $CLASSPATH date= '

For whatever purpose, the script's role is to generate a directory-tree-structured text file that supports Chinese and file directory names with spaces. Like what$./gdt.sh/cygdrive/e/ccccc-oCcccc.txt The/CYGDRIVE/E/CCCCC directory tree structure

Strictly speaking, there is no concept of an expression in the shell. The shell itself is simply a collection of commands, and certainly not a bunch of random piles, but a certain organization. But this organization is not so rigorous, so this

#!/bin/bash #递归打印当前目录下的所有目录文件. PRINTF () { ls $ | While read line #一次读取每一行放到line变量中 do [-D $1/$line] && { dir= "$1/$line" echo $ DIR } dir1= ' dirname $DIR ' #求路径. a= ' ls-f $DIR 1 | grep/| grep "\"

Sed and awk are powerful text filtering tools in the UNIX environment. With SED and awk, it is easy to edit local files, and it is easier to use regular expressions to filter out the output of other commands. SED represents the stream Editor,

The difference between a single middle bracket and a double bracket in a shell 1.["[" is an executable program, the path is "/usr/bin/["He is equivalent to the executable program "test". Example:If [3-eq 2]; Thenecho "= =";Elseecho "!=";Fi

Export database query results through the Shell to Excel, and send messages to the mailbox #!/bin/bash# through the shell to query the data information and save in Excel, and record the log #data:2018-06-14#name:zhang# Database connection address

First, the environmentSystem: Centos6.6 x64Shell:bash, SH[[email protected] ~]$ hostnameShell[[email protected] ~]$ lsb_release -aLSB Version:

1. Interview questions: Use the For loop in the/tmp directory to create 10 HTML files in bulk, where each file needs to contain 10 random lowercase letters Plus fixed string template, such as the followingAaesdffbnv_template.htmlMethod 1:Cd/tmpfor ((

Shell languageScript: Can run, a file, can implement some function (command stacking)[Email protected] ~]# vim/root/stu.shecho Hello WorldCat/etc/redhat-releaseUname-rHostnameIfconfig | Head-2[Email protected] ~]# chmod +x/root/stu.sh[Email

Difference:1, two files are set environment variable file,/etc/profile is a permanent environment variable, is a global variable,/etc/profile.d/set all users to take effect, is also a permanent variable, is a global

The logical relationship of the multiple command execution of bash features:1. Command replacementCOMMAND1 $ (COMMAND2)2. PipingCOMMAND1 | COMMAND2 | COMMAND3 ...3. Sequential execution structureCOMMAND1; COMMAND2; COMMAND3 ...4. Select the

Requirements: Use the shell to customize a variety of personalized alarm tools, but the need for unified management, standardized management.Idea: Specify a script package that contains the main program, subroutine, configuration file, mail engine,

Today when writing a shell script to find the need to set the user's password, and the setting of the password is interactive, so in the script is obviously not very good, so the Internet to find information, found the following two non-interactive

Objective　　After installing CDH and Coudera Manager offline, all of your own apps are installed through Coudera Manager, including HDFs, hive, yarn, Spark, hbase, and so on, and the process is a twist, so don't complain and go straight to the

#!/bin/bash #for嵌套for循环 #9 *9 Multiplication Formula Echo "for 99 multiplication table" for ((I=1; i Do For ((j=1;j Do #当 $j less than or equal to $i, the multiplication table is printed on the screen [ $j-le $i] && echo-n "$i *

[Email protected] ~]#Cat 1.SH #!/bin/bashexec1>>/tmp/2. log2>>/tmp/2. LogDate Echo 111LdkkdfkslfdsDate[[Email protected]~]# ./1.SH[[Email protected]~]#Cat/tmp/2. Log Sat June9 the: ,: +Utc2018111./1.SH: Line6: Ldkkdfkslfds:command not Foundsat June9

awk operatorArithmetic operators: x+y, X-y, x*y, x/y, X^y, x%y-x: Convert to negative +x: convert to NumericString operator: unsigned operator, string connectionAssignment operators: =, + =,-=, *=,/=,%=, ^= + +,--Comparison operators: = =,! =,;, >=,

1. Functions in the shellThe function is to organize a piece of code into a small unit, and give the small unit a name, when the code is used to call thisThe name of a small unit.Format: function F_name () {Commond}function must be placed at the

First, new peanut Shell 1.0On the Peanut Shell official website (http://www.oray.com) Download "New Peanut Shell 1.0" installation software, software installation completed, need to register, after the successful registration of Peanut Shell website