shell function

What is shell scripts? What is shell script (ProgramScripts? Literally, we divide it into two parts. In the "shell" section, we have mentioned in bash that it is a tool interface that allows us to communicate with the system under a text interface.

Preface MySQL has been used for some time. However, installation of MySQL is based on the software source on Linux, and then started conveniently using the shell of MySQL, I do not know much about MySQL internal startup parameters, So I download

Recoverable Security rm We often use rm to delete some files. If you don't shake your hands, it will be a tragedy. You all know... After such a tragedy, I decided to never stop it. I overwrote the shell function and executed the secure rm. This

Recoverable Security rm and restoring security rm We often use rm to delete some files. If you don't shake your hands, it will be a tragedy. You all know... After such a tragedy, I decided to never stop it. I overwrote the shell function and

My new understanding of alias: Using alias to make rm safer, aliasrm Rm's tragedy always happens inadvertently. Therefore, whether in shell scripts or interactive bash environments, you should always think twice before executing rm commands. As a

The function return value in Shell exceeds the limit. This article mainly introduces the function return value in Shell that exceeds the limit. In shell, return is restricted. If the return value exceeds 255, the return value starts from 0, for

After an experiment, I found that it was useless. I still can only run it with python + file names. Or how can I open it? In powershell, I enter the folder where the file is located and enter the file name directly. After the file is added, the file

As we all know, this is an excellent character recognition software. This open source project can be downloaded from http://code.google.com/p/tesseract-ocr/downloads/list.When using, it is recommended to use 3 instead of 2, for some reason, 2 can be

First talk about installing the MVN step, if it is installed can be ignored; Under the TMP directory 1. Create a MVN directory mkdir MVN Cd/tmp/mvn 2. Download wget http://apache.fayea.com/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz 3.

Hostarch: = $ (Shell uname-m | \Sed-e s/i.86/i386/\-E s/sun4u/sparc64/\-E s/arm.*/arm/\-E s/sa110/arm/\-E s/powerpc/ppc/\-E s/ppc64/ppc/\-e s/macppc/ppc/)Hostos: = $ (Shell uname-s | tr ' [: Upper:] ' [: Lower:] ' | \Sed-e ' s/\ (cygwin\). */cygwin/'

The development of the M1 phase is over. Our efforts have been due in return, below we will focus on some of the issues arising from the M1 phase analysis and reflection.I. Vision AND OBJECTIVES 1. Our app is more like a "know" app for

In the reference learning the VI and Vim editor when found that the ex editors as the parent class VI, for our in-depth understanding of VI and VI clones of the past life has great help, it is necessary to separate a document to introduce some

The development of the M1 phase was over, and in the course of the Thursday, our group also reported on the alpha phase. Our efforts have been due in return, below we will focus on some of the issues arising from the M1 phase analysis and reflection.

Everyone in the download a lot of free software to compile the source code, all need to use configure this command, and then Make,make install and so on, here we briefly introduce what is autoconf:1. Basic IntroductionAutoconf is a program that

Directory Introduction Arrays in the shell Definition of an array Use of arrays The actual example Comparison of sizes in the shell Parentheses in the shell Definition of functions in the shell

Php file function flock ???? In the case of concurrency, how does PHP write files? In fact, this problem is not just a problem facing PHP. Both threads and processes may encounter shared resource write conflicts when writing concurrently. During

Return any value from the bash function. unlike other programming languages, a Bash function is more like a subprogram, that is, its return value. it can only be a number and 0 indicates success, if the value is not 0, the operation fails. If you

This article introduces the default installation of rhel5.1 after/etc/rc. d/init. the startup scripts of various services in the d directory are arranged in the alphabetical order of acpid: ACPI advanced configuration and power management interface

In the previous article we introduced the use of signal in detail. Today we will describe the use of slots. In Qt, slots and signal are very similar, this time we will implement a spinbox that can display 16 binary numbers, which inherits from

What is Shell? Shell is a program with special functions. It is an interface between the user and the core program (kernel) of the UNIX/Linux operating system. Why do we say shell is an intermediary between the core program of the system and the