Echo Command in Linux with Examples
Echo Command in Linux
Echo is a built in command for bash and C shells. It can be used to display a line of text on a standard output or it could able to append into a new file.
Syntax
echo < options> < contents>
To input a line of text and display on standard output
[root@linuxhelp Desktop]# echo Linuxhelp is a master in linux and Opensource
Linuxhelp is a master in linux and Opensource
To declare a variable and echo its value
We will declare a variable of x and assign its value to 10
[root@linuxhelp Desktop]# x=100
Echo its value as follows.
[root@linuxhelp Desktop]# echo The value of varible x = $x
The value of varible x = 100
Note: -e in Linux acts as interpretation of escaped characters that are back slashed.
To remove all the spaces in between
' ' &ndash backspace with backslash interpretor ' -e' is used to remove all the spaces in between.
[root@linuxhelp Desktop]# echo -e " Linuxhelp is a master in linux and Opensource"
LinuxhelpisamasterinlinuxandOpensource
To create a new line
The option ‘ ‘ &ndash New line with backspace interpreter ‘ -e‘ treats new line from where it is used.
[root@linuxhelp Desktop]# echo -e " Linuxhelp
is
a
master
in
linux
and
Opensource"
Linuxhelp
is
a
master
in
linux
and
Opensource
To have horizontal tab spaces
Option ‘ ‘ &ndash horizontal tab with backspace interpreter ‘ -e‘ is sued to have horizontal tab spaces.
[root@linuxhelp Desktop]# echo -e " Linuxhelp is a master in linux and Opensource"
Linuxhelp is a master in linux and Opensource
To have vertical tab spaces
[root@linuxhelp Desktop]# echo -e " vLinuxhelp vis va vmaster vin vlinux vand vOpensource"
Linuxhelp
is
a
master
in
linux
and
Opensource
To use option new Line ‘ ‘ and horizontal tab ‘ ‘ simultaneously
[root@linuxhelp Desktop]# echo -e "
Linuxhelp
is
a
master
in
linux
and
Opensource"
Linuxhelp
is
a
master
in
linux
and
Opensource
To use option new Line ‘ ‘ and vertical tab ‘ v‘ simultaneously
[root@linuxhelp Desktop]# echo -e "
vLinuxhelp
vis
va
vmaster
vin
vlinux
vand
vOpensource"
Linuxhelp
is
a
master
in
linux
and
Opensource
To have specified carriage return in output
Option ‘ ‘ &ndash carriage return with backspace interpreter ‘ -e‘ is used to have specified carriage return in output.
[root@linuxhelp Desktop]# echo -e " Linuxhelp
is a master in linux and Opensource"
is a master in linux and Opensource
To continue without emitting new line
Option ‘ c‘ &ndash suppress trailing new line with backspace interpreter ‘ -e‘ is used to continue without emitting new line.
[root@linuxhelp Desktop]# echo -e " Linuxhelp is a master cin linux and Opensource"
Linuxhelp is a master [root@linuxhelp Desktop]#
To omit echoing trailing new line
-n option is used to omit echoing trailing new line.
[root@linuxhelp Desktop]# echo -n " Linuxhelp is a master in linux and Opensource"
Linuxhelp is a master in linux and Opensource[root@linuxhelp Desktop]#
To have sound alert
Option ‘ a‘ &ndash alert return with backspace interpreter ‘ -e‘ is used to have sound alert.
[root@linuxhelp Desktop]# echo -e " Linuxhelp is a master in linux aand Opensource"
Linuxhelp is a master in linux and Opensource
To print all the files/folder using echo command
[root@linuxhelp Desktop]# echo *
111.txt file1.txt file2.txt untitled folder
To print files of a specific kind
You can print all the jpeg file by using the following command.
[root@linuxhelp Desktop]# echo *.jpeg
a1.jpeg a2.jpeg a3.jpeg abc.jpeg b1.jpeg b2.jpeg c1.jpeg
To output to a file and not standard output
The redirect operator can be used with echo to output to a file and not standard output.
[root@linuxhelp Desktop]# echo " Linuxhelp Page" > linuxhelppage
[root@linuxhelp Desktop]# cat linuxhelppage
Linuxhelp Page