How Do You Know if Your Echo Is an Echo Plus
The echo command is one of the nigh usually and widely used congenital-in commands for Linux bash and C shells, that typically used in a scripting language and batch files to display a line of text/string on standard output or a file.
The syntax for the echo command is:
echo [option(due south)] [cord(due south)]
ane. Input a line of text and display it on standard output
$ echo Tecmint is a community of Linux Nerds
Outputs the following text:
Tecmint is a customs of Linux Nerds
2. Declare a variable and repeat its value. For example, Declare a variable of ten and assign its value=10.
$ ten=x
repeat its value:
$ echo The value of variable ten = $x The value of variable x = 10
Note: The '-eastward' option in Linux acts equally an interpretation of escaped characters that are backslashed.
iii. Using pick '\b' – backspace with backslash interpretor '-e' which removes all the spaces in between.
$ repeat -eastward "Tecmint \bis \ba \bcommunity \bof \bLinux \bNerds" TecmintisacommunityofLinuxNerds
4. Using selection '\n' – New line with backspace interpretor '-e' treats new line from where it is used.
$ echo -e "Tecmint \nis \na \ncommunity \nof \nLinux \nNerds" Tecmint is a community of Linux Nerds
5. Using option '\t' – horizontal tab with backspace interpretor '-east' to accept horizontal tab spaces.
$ repeat -eastward "Tecmint \tis \ta \tcommunity \tof \tLinux \tNerds" Tecmint is a community of Linux Nerds
6. How about using option new Line '\due north' and horizontal tab '\t' simultaneously.
$ echo -due east "\n\tTecmint \n\tis \n\ta \n\tcommunity \due north\tof \due north\tLinux \n\tNerds" Tecmint is a community of Linux Nerds
7. Using option '\v' – vertical tab with backspace interpretor '-eastward' to take vertical tab spaces.
$ echo -east "\vTecmint \vis \va \vcommunity \vof \vLinux \vNerds" Tecmint is a community of Linux Nerds
viii. How about using option new Line '\northward' and vertical tab '\v' simultaneously.
$ echo -e "\due north\vTecmint \n\vis \northward\va \north\vcommunity \n\vof \n\vLinux \n\vNerds" Tecmint is a community of Linux Nerds
Note: We tin double the vertical tab, horizontal tab, and new line spacing using the option two times or as many times equally required.
9. Using option '\r' – wagon render with backspace interpretor '-eastward' to have specified carriage render in output.
$ repeat -e "Tecmint \ris a community of Linux Nerds" is a community of Linux Nerds
x. Using option '\c' – suppress trailing new line with backspace interpretor '-e' to go on without emitting new line.
$ echo -e "Tecmint is a community \cof Linux Nerds" Tecmint is a community [email protected]:~$
11. Omit echoing abaft new line using the option '-n'.
$ repeat -north "Tecmint is a community of Linux Nerds" Tecmint is a community of Linux [email protected]:~/Documents$
12. Using option '\a' – alert render with backspace interpretor '-e' to have the sound alert.
$ echo -eastward "Tecmint is a community of \aLinux Nerds" Tecmint is a community of Linux Nerds
Note: Make sure to bank check the Volume primal, earlier firing.
xiii. Print all the files/folders using echo command (ls control alternative).
$ repeat * 103.odt 103.pdf 104.odt 104.pdf 105.odt 105.pdf 106.odt 106.pdf 107.odt 107.pdf 108a.odt 108.odt 108.pdf 109.odt 109.pdf 110b.odt 110.odt 110.pdf 111.odt 111.pdf 112.odt 112.pdf 113.odt linux-headers-3.16.0-customkernel_1_amd64.deb linux-image-3.sixteen.0-customkernel_1_amd64.deb network.jpeg
14. Print files of a specific kind. For example, let'south presume y'all want to print all '.jpeg' files, employ the following command.
$ echo *.jpeg network.jpeg
15. The echo can be used with a redirect operator to output to a file and not standard output.
$ echo "Exam Page" > testpage ## Check Content [email protected]:~$ true cat testpage Examination Page
echo Options
| Options | Description |
| -north | do not print the trailing newline. |
| -eastward | enable interpretation of backslash escapes. |
| \b | backspace |
| \\ | backslash |
| \n | new line |
| \r | carriage return |
| \t | horizontal tab |
| \v | vertical tab |
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