perl execute shell command and get output

I. Data Types(Data type): Perl has four data types: Scalar (variable), Scalar Array (Array), Hash Array (Hash), and References (pointer ), it seems to be rare, but it is more than enough to use it. Especially when writing Perl programs, you do not

one. DataType (data type ):Perl's data types are roughly four: Scalar (variables), Scalar Array (array), hash array (hash), References (pointer), but they seem to be small but more than sufficient. In particular, you can write a Perl program without

Learning Perl 4ed Reading Notes Chapter2 scalar data1. Numbers. All data (INT, float) is of the double type in Perl. Of course, sometimes Perl also uses integer to represent int internally, because this can improve the running speed of the program,

'), System, and exec in Perl In Perl, the check mark (''), system, and exec are used to execute the command order. This article will show us how they are used, approached, and differentiated.   I. utilization methods 1. check mark ('') First of all,

What is a shell scriptShell scripting (English: Shell script), also known as shell Command Draft, programmatic script, is a computer program and text file, the contents of a series of shell commands, through the Unix shell literal translation of its

When we talked about the number of scripts being executed in CU a few days ago, we found that we knew little about how to execute commands in shell... thank you for your advice! In addition to being inaccurate in some places, his statement is

What is a shell script sampleLet's look at an example:#!/bin/shcd ~mkdir shell_tutcd shell_tutfor ((i=0; iExample explanation Line 1th: Specify the script interpreter, here is the interpreter with/bin/sh Line 2nd: Switch to the current

When to use the shell Because the shell appears to be a common feature between UNIX systems, and has been standardized by POSIX. As a result, the shell script can be applied to many systems as long as it is written "attentively". Therefore, the

2.2.1, Shell Introduction (1) Shell can be understood as a software system to provide user operation of the command line interface, it can be said that he is a way of human-computer interaction (2) We can use the shell and the operating

Part I Programming Perl 1 Perl Data Types 1.1 Funny Characters Type Character Example is a name for: Scalar $ $cents An individual value (number or string) Array @ @large