linux shell

space, which is used to report the use of disk space in the file system Related commands Du (disk usage) Diskette utilityFree Memory Information Getting Started example 1. $df As shown in figure: Explanation:DF Default printing information, with K as block, calculate hard disk total space, used and available, and file system mount point 2. $DF –m As shown in figure: Explanation: Change the basic unit of a block 3. $DF-T As shown in figure: Explanation: Type of file system to p

Copy Code code as follows: #!/bin/sh # Desc:setup Linux system security # AUTHOR:CORALZD # Powered by www.freebsdsystem.org # version 0.1.2 written by 2011.05.03 #account Setup Passwd-l XFS Passwd-l News Passwd-l NSCD Passwd-l Dbus Passwd-l VCSA Passwd-l Games Passwd-l Nobody Passwd-l Avahi Passwd-l Haldaemon Passwd-l Gopher Passwd-l FTP Passwd-l Mailnull Passwd-l Pcap Passwd-l Mail Passwd-l shutdown Passwd-l Halt Passwd-l

Q: What is a shell and what is a shell script? The A:shell is a program written in C that is a bridge between the user and the Linux operating system. Users can either enter command execution and use shell scripting to accomplish more complex operations. It is a general designation of command Language, command interpr

Shell The technique of text slicing inIn the shell there is also a string slice this thing exists, has been used in Python slices, the following record the use of slices in the shell.(1) , replacing some of the text in the variable contents$var = "This was a line of text"$ echo${var/line/replaced}This is areplaced of text " Line be replaced by replaced . (2) ,

Shell script: 1, #! Shell that specifies script execution2, # Annotation3. command or grammatical structureecho "Input"Echo Output blank linePerform: 1. Shell ScriptSH Example2, to the shell script execution permissionschmod U+x ExampleCase: Example sysinfo.sh3ABC x cannot begin with a numberAbc3ABC3 environment var

There are multiple shells in Linux, where Bash is used by default. This chapter describes how shell works, shell types, General Shell operations, and bash features. Shell is the interface between the user and the Linux operating s

use external program files to run.(1) such as exit and CD are built-in commands$type exit$type CDSome commands have multiple implementations, such as PWD and Echo, which have both external and built-in commands#type-a EchoThe which only displays external command files.Type-a shows two implementations of each command.Tip: For multiple implementations of the command, the default execution is built-in, if you want to execute an external command can specify the corresponding file is good.Like what$

This article is part of the Linux Shell Series Tutorial (vii), more shell tutorials See: Linux Shell Series Tutorials As with other languages, there are output operations in the shell, and in practical applications it is also

There are two ways to execute shell commands under Linux Executing shell commands in the current shell Generates a subshell in the current shell, executing shell commands in Subshell 1. Executing

If statement formattingIf conditionThenCommandElseCommandFi, don't forget this ending.If statement forgets the end fiThree conditional expressions of Test.sh:line 14:syntax error:unexpected end of Fi if IfCommandThen ifFunctionThenCommand executed successfully, equal to return 0 (such as grep, find a match)Execution failed, returned non 0 (grep, no match found)if [Expression_r_r_r]Then the result of the expression is true, return 0,if to the 0 value thenif test Expression_r_r_rThen the result o

Introduction to Shells and scripts The Gnu/linux Shell is an interactive tool that provides users with the means to start programs, manage files on file systems, and manage processes running on Linux systems. At the heart of the shell is the command line prompt It's the interactive

Linux command and ShellThe so-called Shell is the command interpreter, which provides programming interfaces that can be programmed using programs. Learning the shell is very important for Linux beginners to understand Linux systems. LThe

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