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hey everyone welcome back to our channel
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the place where we simplify Linux
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scripting and cloud technology step by
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step In today's video I will show you
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how to add single line and multi-line
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commands in cell scripts It is an
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essential skill to make your scripts
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clear organized and easier to maintain
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Let's get started Before we dive into
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the how let's quickly understand why
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comments matter It explain what the
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script does It describe complex logic It
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temporarily disable the lines during the
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testing Help others to understand your
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code easily Trust me clear commands can
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save you hours of confusion later Now
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let's see how to add a single line
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command in a cell script For the
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interest of time I have a demo script So
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in order to add a single line command
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it's simple Start the line with a hash
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symbol Let's open the script using vi
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editor Let's say under this package
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management I would like to put a
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command for this command For that go to
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the insert modes Type h has symbol at
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the beginning of line Now save the
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file Now during the execution of this
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script this line will not be executed
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because we have put command using a hash
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symbol All right What about multi-line
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commands b doesn't have built-in
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multi-line command syntax like other
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programming languages But there are
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couple of easy workarounds through which
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we can have multiple line commands in
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our shell script The first method is
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using multiple hash symbols Let's assume
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I want to comment out this complete uh
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section package management For that I
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have to comment out all of these lines I
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can do it using multiple hash symbols Go
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to the insert mode again and type hash
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at the beginning of each
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line Now save the file By using multiple
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hash symbols we have completely comment
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out the package management section here
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What if this package management could
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have uh 100 plus of lines then putting
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hash in front of each line will take
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time So in order to overcome that we
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have another method We call it hair
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document with colon Let's see how we can
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implement that Let me remove the
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comments Type here colon then double
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less than symbol in quotes Type comments
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comment at the end Close this section
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with a comment keyword Now save this
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This indicates that starts a hair
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document and everything mentioned
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between this comment section will be
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ignored or we can say that it is
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commented out So during the execution of
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the script this package management
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section will be ignored We can also
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implement multi-line commands using pure
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do without colon For this we have to
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only The rest of syntax will remain the
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same Let's save the file Everything
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unclosed in the comment section will be
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ignored or we can say it would be
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commented out So when we execute the
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script this package section will not be
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executed If you want to remove this
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comments you simply delete the beginning
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document and delete this comment
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keyword and save the file If you are
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using Vim editor in order to edit the
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script then you can use visual mode as
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well in order to add single or
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multi-line commands How we can do that
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see Let's suppose I want to comment out
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this backup important directory
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section For that what I can do first I
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need to enter into the usual mode For
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that type control V Use keys to select
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I We will enter into the insert mode
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Type hash symbol And when you do
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escape it will automatically add hash
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symbol at the beginning of all the
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selected lines Now you can save this
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file In order to remove these commands
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in visual mode again enter into the
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visual mode by typing Ctrl +V Use down
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arrow keys and select the
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lines and press X to delete the hash
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symbol Save and close the
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file And that's it Now you know exactly
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how to add single line or multi-line
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commands in your cell scripts If you
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found this video tutorial helpful give
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