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Was check what permission are said for our script.

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Firstly I will clear the screen and then using as Desch L command a list and dedicatory dish out is

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argument to outlasts command and it shows us our extended information about files and directories such

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as permission and ownership because we don't want to display extended information about all files in

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the current directory.

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And we can use another argument to ask someone to specify the file.

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It means that we will see information only about that file.

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So I am typing out as.

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And the name of our script

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now you see on the informations about our script but doesn't it.

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Permission means in Unix like systems the permissions of files are divided into three categories.

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First category means permission for owner of that file.

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Second category is group permission and it tells us that all users of that group will have following

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permissions.

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So the category is for the others which are not part of first two categories.

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But let's quickly talk about characteris permission field araw means that it's permission to read permission

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then read that file.

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W means write permission where it can write to that file without the right permission.

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We couldn't even create our first script X means execute permission and whoever has it together with

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the permission then can execute that script if we want to change file permissions.

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We need to use change mode command by typing change mode.

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A plus X followed by the screen name we granting execute permissions for all users.

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He had a correct means for all three categories change permissions plus X means a grand exit but emissions

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by typing ls command we can ensure that exec permissions has been added.

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If you want to move permissions we can use the same command except for a plus sign we use mimes.

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Here we can see that execute permissions is missing.

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Just for the recap type.

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The exact same commands.

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Unsure what changes are made to file permissions.

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Do remember how I told you about three permissions categories.

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We can't of course change permissions only for specific category but start with the file owner by typing

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changement you plus x.

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I will change permissions only for the file owner.

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Here we can see that execute permissions for file owner is present.

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Now we also change permissions for a group file owner.

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We will do that by typing changement

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G plus X

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by typing ls command we can see that execute permission is present here to change permission for others

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we'll use changement all plus X by typing ls command.

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We can see that ex-secret permission is also valid for others.

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It is also possible to change permission using numeric value Rait permission represents.

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Number four write permission.

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Represent.

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Number two execute permission represents value 1.

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For example if you want to put forth file only the maximum permissions it voodoo represents number 7.

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And if you want to give someone only three permissions it would be the number for number six would then

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I represent possibility to read.

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And right now by typing Chaiyaphum thought 644.

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I am removing execute permissions from our script and we can see it right now

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if I want to grant back exec with permission I would type change mode 7 5.

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And by that I am granting again exec permission.

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Throughout the course I will be mostly using changement a class X which is granting execute permission

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for everyone.

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So if you remember only that it is enough for you and you are good to go.

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We have now said the permissions so we can finally run the script to do so type dot slash followed by

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the script name and it's running great but what does dot slash means by typing that we are telling that

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we will invoke descript in current directory.

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This is the most common way to run the script but there is another option to use or pop.

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We just prepend the output of B W D command before our script name.

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Another option how to run the script is by editing and vitamine variable called Pop.

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We can display content of Foth variable using echo command.

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If the directory that the script is located is included in the variable path we can invoke the script

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only by typing its name to add something to pop.

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The use command export

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Export pop echo

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Dallara pop call on and for part two directory that the is located.

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If we are now at the directory where script is located we can use command B W D instead.

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Now I can see that home Richard was added to pop.

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Great now I can run the script only by calling it name.

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I check it and it's working perfectly to check that it is working from everywhere.

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I will switch to another directory and call script again.

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It is working.

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But here I can see that output of our command is not to display.

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It's because in my current directory there is nothing to display.

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So switching to some not empty directory should be enough

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so I will go once the back and switch to another directory.

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Now I can see also the output of ls command.