Script Dev Null
Standard Input Redirect From Dev Null C Programming

Home > Articles

␡

/path/to/program arg1 arg2 /dev/null 2 /dev/null The syntax 2&1 means 'Send output currently going to file descriptor 2 to the same place that output going to file descriptor 1 is going to'. is omitting the default of FD1, so it is semantically the same as 1, which might make 2 make more sense. Aug 15, 2019 In Linux, stdin is the standard input stream. This accepts text as its input. Text output from the command to the shell is delivered via the stdout. To have the output of a stream redirected and silently thrown away, direct the output to /dev/null. Detecting Redirection Within a.

Objectives

Page 1 of 11Next >

Learn how to use shell features to make your work faster and easier. All of the features covered in this chapter work with both bash and tcsh.

Save 35% off the list price* of the related book or multi-format eBook (EPUB + MOBI + PDF) with discount code ARTICLE.
* See informit.com/terms

This chapter is from the book 

Practical Guide to Linux Commands, Editors, and Shell Programming, A, 4th Edition

Script Dev Null

This chapter is from the book

This chapter is from the book 

Practical Guide to Linux Commands, Editors, and Shell Programming, A, 4th Edition

Linux Shell Features

Objectives

After reading this chapter you should be able to:

List special characters and methods of preventing the shell from interpreting these characters
Describe a simple command
Understand command-line syntax and run commands that include options and arguments
Explain how the shell interprets the command line
Redirect output of a command to a file, overwriting the file or appending to it
Redirect input for a command so it comes from a file
Connect commands using a pipeline
Run commands in the background
Use special characters as wildcards to generate filenames
Explain the difference between a stand-alone utility and a shell builtin

This chapter takes a close look at the shell and explains how to use some of its features. It discusses command-line syntax and describes how the shell processes a command line and initiates execution of a program. This chapter also explains how to redirect input to and output from a command, construct pipelines and filters on the command line, and run a command in the background. The final section covers filename expansion and explains how you can use this feature in your everyday work.

Except as noted, everything in this chapter applies to the Bourne Again (bash) and TC (tcsh) Shells. The exact wording of the shell output differs from shell to shell: What the shell you are using displays might differ slightly from what appears in this book. For shell-specific information, refer to Chapters 8 (bash) and 9 (tcsh). Chapter 10 covers writing and executing bash shell scripts.

Related Resources

Book $47.99

Standard Input Redirect From Dev Null C Programming

Online Video $159.99

Book $119.00