Shell

Directory: Initial Hive Hive Installation and Configuration Hive built-in operator and function development Hive JDBC Hive parameters Hive Advanced Programming Hive QL Hive Shell Basic Operations Hive optimization Hive Architecture The principle of

Shell Online Chinese manual abs,shell Chinese course, Shell Chinese course-submarine Eagle (tank) Blog http://manual.51yip.com/shell/ Http://mprc.pku.edu.cn/mentors/training/TrainingCourses/material/ShellProgramming.HTM Common sense of shell

I. OverviewThe shell is a program written in C that provides access to the operating system kernel services through a shell user. It is similar to DOS command and later cmd.exe. The shell is both a command language and a programming language.Shell

1. Shell Introduction 1.1 Shell appearance backgroundThe Shell is both a scripting language and a software for connecting cores and users.For the graphical interface, the user can start a program by tapping an icon, and for the command line, the

ShellSpecial variables: Shell $, $#, $*, [email protected], $?, $$ and command line argumentsAs already mentioned, variable names can only contain numbers, letters, and underscores, because some variables that contain other characters have special

Logical judgments in shell scripts1.if then fi[[email protected] shell]# cat if1.sh#!/bin/basha=5if [ $a -gt 3 ]then echo okfi2.if then else fi:[email protected] shell]# sh -x if2.sh + a=1+ ‘[‘ 1 -gt 3 ‘]‘+ echo nooknook[[email protected]

When scripting is often written in operations, most people first think of using "-eq" for comparisons when using variables intermittently, but in fact if the variable value is null (NULL) for a special reason, bash shell converts null to 0 for "-eq"

8.10 Shell Special Character _cut command* Any of any characters？ Any one character#注释符号\ de-Justification symbol| pipe character"$" the symbol with "!" "!$" means the last variable in the previous command";" Delimiter, use "~" User's home directory

In this chapter we'll look at a seemingly trivial detail-our shell. This examination would reveal some of the inner working of the shell and the terminal emulator program itself.Many things in linux,the shell prompt was highly configurable,and while

Execute shell command in PythonThe previous execution of the shell command is mostly done by Os.system (Shell command), which is more cumbersome.Understand that SH is a better library than subprocess, capable of executing shell commands1. View

The printf command mimics the printf () program in the C library.Standard, so scripting with printf is better than using echo portability.printf uses reference text or space-delimited parameters, which can be used outside of the format string in

There is also a very useful feature in Bash's operating environment, which is the wildcard character (wildcard)! It's even easier for us to use bash to process data! Below we list some commonly used wildcard Fu Yi: Symbol

Transfer from http://roclinux.cnThis original article belongs to "Linux greenhouse" blog, the blog address is http://roclinux.cn. The author of the article is rocrocket.===[Start of body]Sometimes learning scripts, you will find the sort command

Original article link I. Classification of shell environment variables and differences between set env export:   Set: Display (SET) private variables and user variables included in Shell variables. Shell of different classes have different

You can use anyProgramTo compile the shell program. Because the shell program is interpreted and executed, it does not need to be compiled into the target program. According to the shell programming Convention, for example, the first line of the

1 PS-EF: displays running processes, PID, and other information Uid pid ppid C stime tty time cmdroot 1 0 0 03:45? 00:00:02 init [5] Root 2 1 0? 00:00:00 [migration/0] root 3 1 0 0:45? 00:00:00 [ksoftirqd/0] root 4 1 0? 00:00:00 [events/0] root 5 1 0

   The company's Linux server uses a common desktop and lacks a disaster recovery mechanism. The company stores a large amount of data on this server. Once a fault occurs, the consequences are

FS Shell Use bin/hadoop FS to call the File System (fs) Shell Command. All FS shell commands use the URI path as the parameter. The URI format is scheme: // authority/path. For HDFS file systems, scheme is hdfs, for local file systems, and scheme

Because development requires that the development environment be automatically deployed every night, it takes one day to write a jboss-based Automatic deployment script. #!/bin/bash#deploy jboos script#Usage(){ echo "Usage: `basename $0` -D earDir -

Shell-encrypted shc vulnerability and shell-encrypted shc Vulnerability Recently, I have been compiling Shell scripts for customers to use. I will inevitably encounter some sensitive information that I don't want them to know. So I used Shc script