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Comments are lines that are ignored by the interpreter and are only used to describe what is happening in the code or to provide insight into a particular block or line of code. Comments make it easier for the reader to understand the code. We can use comments to describe what is happening in the code in human language. It can also be helpful when we review our code after writing it for a while. Comments are also useful when debugging the code. Instead of deleting the part that is suspected to have a bug, we can comment out the specific part and then debug the code.

#We can use and heredocto write comments in Bash . Generally speaking, #is used to write single-line comments and heredocis used to write multi-line comments.

BashSingle-line comments in

We use #the _ notation Bashto write single-line commands in . #After _, #!everything except the first line containing _ is ignored when interpreting the script. This special sequence of _ that appears on the first line #!is called _ Shebang, and it is used to decide which interpreter to use.

Comments can start at the beginning of a line, or even inline with code.

#!/bin/bash
echo "Hello World!" # echo is similar to print statement.
# end of the code

Output:

Hello World!

Here, the first line indicates which compiler to use /bin/bash.

On the second line, we have the inline comment, and on the third line, we have a comment that starts at the line.

BashMulti-line comments in

BashMulti-line comments are not supported. BashOne way to write multi-line comments in is to use single-line comments for each line.

# This is a
# multiline comment in Bash
echo "Hello World!"

Output:

Hello World!

Here, lines 1 and 2 can be considered as multi-line comments, with each line interpreted as a separate comment by the interpreter.

We can also use Heredocto write multi-line commands. Heredocis a way to pass multiple lines of input to a command. If Heredocis not redirected to any command, we can Heredocuse as a multi-line comment.

#!/bin/bash

<< 'Comment'
    Everything inside the
    HereDoc body is
    a multiline comment
Comment
echo "Hello World!" 

Output:

Hello World!

Here, lines 3-7 are treated as multi-line comments by the interpreter.