Understanding on

Theherestring is used forinputredirection from <indexentry content=”<<text or a variable. Input is mentioned on the same line within single quotes ('').

The syntax is as follows:

$ command <<< 'string'

• Let’s see the following example,hereString_01.sh:

hereString_01.sh

#!/bin/bash 
wc -w <<< 'Good Morning and have a nice day !' 

• Save the file, give the permission, and run the script as follows:

$ chmod u+x hereString_01.sh
$ ./hereString_01.sh

• Here is the output:

Output:

8

In this example, the string Good Morning and have a nice day ! is called as the here string.