It offers no formatting option. This is a built in command that is mostly used in shell scripts and batch files to output status text to the screen or a file. That’s easy, just put a backslash This wraps the word “geek” in double quote marks for us. It is a good command to display a simple output when you know that the variable's contents will not cause problems.
The And of course, we can include variables to add some useful information to our file.
We’re going to use the date command. If the file is a logfile, we might want to have a timestamp added to it.
We can do that with the next command.Note the single quote marks around the parameters for the A simple command, but indispensable. Syntax : echo [option] [string]
For most uses, printf is preferable. Type ECHO without parameters to display the current echo setting (ON or OFF). The above article may contain affiliate links, which help support How-To Geek.How-To Geek is where you turn when you want experts to explain technology. We can use variables with There is a caveat. You need to provide format string using % directives and escapes to format numeric and string arguments in a way that is mostly similar to the C printf() function. One tip is to use the command on its own before you start using it with echo. The arguments passed to echo are printed to the standard output.. echo is commonly used in shell scripts to display a message or output the results of other commands.. echo Command #. To display the value of a variable, either use echo or printf command as follows: During his career, he has worked as a freelance programmer, manager of an international software development team, an IT services project manager, and, most recently, as a Data Protection Officer. Since we launched in 2006, our articles have been read more than 1 billion times. Display messages on screen, turn command-echoing on or off.
echo command in linux is used to display line of text/string that are passed as an argument . We’ll see more of these So far, we’ve been writing predefined text to the terminal window. Key ON : Display each line of the batch on screen (default) OFF : Only display the command output on screen message: a string of characters to display ? If you’ve wrapped your string in single quote marks And, satisfied that we’re getting what we expect from the date command, we’ll integrate it into an Note the command is inside the parentheses and the dollar sign The text is split into a new line where we’ve used the The “123” characters are overwritten by the “456” characters.This command lists all of the files and directories in the current directory:This command lists all of the files and directories in the current directory whose name starts with “D” :This command lists all of the “.desktop” files in the current directory:A new file is created by the first command, and text is inserted into it.
It is a good command to display a simple output when you know that the variable's contents will not cause problems. It offers no formatting option. If it didn’t exist, we’d have to invent it.Dave McKay first used computers when punched paper tape was in vogue, and he has been programming ever since. For most uses, printf is preferable. printf command format and display data on screen. Look at this example:The single quote or apostrophe in the word “I’m” confused To include a single quote in a string, the simplest solution is to wrap the whole string within double quote marks:Wrapping your text in double quote marks is good general advice. Dave is a Linux evangelist and open source advocate. Declare a variable and echo its value. Input a line of text and display on standard output $ echo Tecmint is a community of Linux Nerds Outputs the following text: Tecmint is a community of Linux Nerds 2. : Display help. ECHO. Generating Output With echo command. The second command adds a line of text to the bottom of the file. The syntax for echo is: echo [option(s)] [string(s)] 1. echo is a shell builtin in Bash and most of the other popular shells like Zsh and Ksh. After over 30 years in the IT industry, he is now a full-time technology journalist. Use printf to generate formatted output.
In scripts, it cleanly delimits the parameters you’re passing to What if you want to include a double quote character in your string of text?
echo Command Examples #!/bin/bash # Display welcome message, computer name and date echo "*** … echo command examples. We can use a command with echo and incorporate its output into the string that is written to the terminal window. But as you experiment, you’ll soon discover that things can get slightly more complicated. However, printf does not provide a new line. Use echo command to display a line of text or a variable value. Use echo command to display a line of text or a variable value.
We must use the dollar sign $ as though the command was a variable, and wrap the whole command in parentheses. Zeus was fond of leaving Mount Olympus to consort with beautiful nymphs. The echo command is one of the most basic and frequently used commands in Linux. Syntax ECHO [ON | OFF] ECHO [message] ECHO /? On one trip, he told a mountain nymph called Echo to Whilst not laden down with a multitude of bells and whistles, there’s a good chance that We can see the two different versions by using the following commands:The examples shown here all use the default version of To write a simple string of text to the terminal window, type The text is repeated for us. From Linux Shell Scripting Tutorial - A Beginner's handbook# not advisable unless you know what the variable contains