Let us look at the field present in the syntax of the echo command:<\/p>\n
1. <options><\/strong><\/p>\n This field takes in a range of options that specify how the echo command should function and print the output.<\/p>\n 2. <text><\/strong><\/p>\n This field takes in the text that you want to print. In this field, you can specify characters, words, variables, or simple lines of text.<\/p>\n Unlike the typical Linux fashion, where every command has a truckload of options, echo has only five options. Let us look at them:<\/p>\n 1. -n<\/strong><\/p>\n This option does not output a trailing newline.<\/p>\n 2. -e<\/strong><\/p>\n This option enables the interpretation of backslash escape sequences. We will look into these escape sequences in the next section.<\/p>\n 3. -E<\/strong><\/p>\n This option disables the interpretation of backslash escape sequences. This option is already selected by default.<\/p>\n 4. –help<\/strong><\/p>\n This option displays the help menu of the echo command.<\/p>\n 5. –version<\/strong><\/p>\n This option shows the version of the echo command you are using.<\/p>\n We have seen that the echo command has escape sequences like “\\n” and “\\t” we have also seen that we can use such escape sequences when we pair the echo command with the option “-e” let us look at the different escape sequences and what they are used for.<\/p>\n 1. \\\\<\/strong><\/p>\n This escape sequence lets you print a literal backslash (\\) in your text.<\/p>\n 2. \\a<\/strong><\/p>\n This escape sequence gives you an alert (the BELL character).<\/p>\n 3. \\b<\/strong><\/p>\n This escape sequence stands for a backspace.<\/p>\n 4. \\c<\/strong><\/p>\n This escape sequence produces no further output after this.<\/p>\n 5. \\e<\/strong><\/p>\n This escape sequence stands for escape (Esc).<\/p>\n 6. \\f<\/strong><\/p>\n This escape sequence gives a form feed.<\/p>\n 7. \\n<\/strong><\/p>\n This escape sequence gives a new line. It means the text after this will appear in a new line and not in the same line before it.<\/p>\n 8. \\r<\/strong><\/p>\n This escape sequence gives a carriage return.<\/p>\n 9. \\t<\/strong><\/p>\n This escape sequence prints a horizontal tab (4 spaces).<\/p>\n 10. \\v<\/strong><\/p>\n This escape sequence prints a vertical tab (4 lines).<\/p>\n 11. \\0<nnn><\/strong><\/p>\n This escape sequence is a byte with the octal value of the specified value “nnn”.<\/p>\n 12. \\n<hh><\/strong><\/p>\n This escape sequence is a byte with the hexadecimal value specified by the user “hh.”<\/p>\n Now that we have laid down the fundamentals and theory of the echo command let us look at some examples of using the echo command.<\/p>\n It would be a shame to print anything other than the cliched “Hello World” statement to print our first text using the echo command. To do so, write the echo command followed by the text you want to print such that it is enclosed in double-quotes (“\u201d) as shown below:<\/p>\n We saw that to use escae sequences. First, we must use the option “-e” and only then specify these sequences in our text. Let us look at some of these sequences in action.<\/p>\n 1. Printing a new line<\/strong><\/p>\n If you want to print a text in a new line, use the escape sequence “\\n”. Use the syntax shown below:<\/p>\n 2. Printing a horizontal tab<\/strong><\/p>\n If you want to print a horizontal tab (4 spaces), use the escape sequence “\\t”. Use the syntax shown below:<\/p>\n 3. Printing a vertical tab<\/strong><\/p>\n If you want to print a vertical tab (4 lines), use the escape sequence “\\v”. Use the syntax shown below:<\/p>\n 4. Printing a backslash<\/strong><\/p>\n While using the echo command, If you want to print a backslash in your text, you cannot write the backlash as it is. Why? Because the echo command will think that you are trying to write an escape sequence and print an error. Therefore to print a literal backslash, you need to use the escape sequence “\/\/” as shown below:<\/p>\n 5. Omitting part of a string in linux<\/strong><\/p>\n While using the echo command, if you want to shorten part of the string by omitting the part that follows the escape character in the output, use “\\c” as shown below:<\/p>\n 6. Changing the colour of a string<\/strong><\/p>\n We can use the ANSI escape sequences to change the colour of the output text.<\/p>\n If we want to write the text that we are printing with the echo command to a file, we can use the redirection operator (>>) as shown below:<\/p>\n We can also print variables using the echo command. For example, we can directly print the predefined environment variables as shown:<\/p>\n Or we ourselves can assign a variable and then print it as shown below:<\/p>\n We can also print the output of other commands using the echo command, but why would you do that? Well, we can print a custom message before the command output, as shown below:<\/p>\n Here is another example:<\/p>\n We all know that we list the contents of a specific directory using the “ls” command. What if I tell you you could also do the same with the echo command? You can use the command “echo *” to print all the contents (directories and files) in the current directory.<\/p>\n <\/p>\n Similarly, you can also list only specific types of files by specifying the type after the wildcard (*) as shown below:<\/p>\n You can combine two or more escape sequences as you like. There is truly no limit! Let us look at one such example:<\/p>\n If you want to use the backspace in your text in the echo command, use the escape sequence “\/b” as shown below:<\/p>\n If you don\u2019t want a new line then pair the echo command with the option \u201c-n\u201d as shown:<\/p>\n If you want to print the information regarding the echo command you are using in your system, type the command “\/bin\/echo –version” in the terminal as shown below:<\/p>\nOptions used with Linux echo command<\/h3>\n
Escape sequences used with Linux echo command<\/h3>\n
Printing “Hello World!”<\/h3>\n
![\"printing](\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2023\/01\/printing-hello-world.webp\")
<\/a><\/p>\nUsing escape sequences in linux<\/h3>\n
echo -e \u201c<text1> \/n<text2>\u201d<\/pre>\n
<\/a><\/p>\necho -e \u201c<text1> \/t<text2>\u201d<\/pre>\n
<\/a><\/p>\necho -e \u201c<text1> \/v<text2>\u201d<\/pre>\n
<\/a><\/p>\necho -e \u201c<text1> \/\/<text2>\u201d<\/pre>\n
<\/a><\/p>\necho -e \u201c<text1> \/c<text2>\u201d<\/pre>\n
<\/a><\/p>\n<\/a><\/p>\nWriting to a file in linux<\/h3>\n
sudo echo \u201c<text>\u201d >> <filename><\/pre>\n
<\/a><\/p>\nPrinting variables in linux<\/h3>\n
<\/a><\/p>\n<\/a><\/p>\nDisplaying the output of other commands in linux<\/h3>\n
<\/a><\/p>\n<\/a><\/p>\nListing contents of the present directory using the echo command<\/h3>\n
<\/a><\/p>\n<\/a><\/p>\nCombining escape sequences in linux<\/h3>\n
echo -e \"\\n\\t<text1>\\n\\t<text2>\"<\/pre>\n
Backspace in the echo command<\/h3>\n
<\/a><\/p>\nOmit trailing new line<\/h3>\n
echo -n <text><\/pre>\n
<\/a><\/p>\nPrinting the version of the echo command<\/h3>\n