The following program works fine; however, I don't understand the following line of it.
cp $1 $1.BAK-$i

You can make backup copies of a file using the following program.
What is '' -$i '' ?

If you have a file named 'text' , this will create '' text1.BAk , text.BAK2, text.BAK3, etc.
What is '' $1.BAK -$I '' ?

Your help is appreciated.
------------------------------------------------
#!/bin/sh
for i in 0 1 2 3 4 5 6 7 8 9 ; do
cp $1 $1.BAK-$i
done

Is this an excercise from a shell scripting course?
Otherwise the loop doesn't look very useful to me.
It only creates ten copies of a file whose name has been passed
as 1st argument to the script and gives each copy the extension .BAK-[0-9]

buffonix

I am not studying nowadays. I studied those things nearly 1 year ago.

Now I am trying to brush up my knowledge using online resources.

I have forgotten a lot of basics.

What is this '' -$i '' is doing is not clear to me?

The '' - '' (minus) sign is a puzzle for me.

That's a dash and not a minus sign in your example "BAK-" is BAK with a dash.

This script:
is taking an argument, which is expected to be a file and creating 10 copies of it.

Example:
yourscript.sh MyFile.txt
results in 10 copies named MyFile.txt.BAK-0, MyFile.txt.BAK-1, MyFile.txt.BAK-2, MyFile.txt.BAK-3, etc.

Thanks tmarkile

Now things are clear to me. I will be posting more and more in the coming few days. I am trying to study or rather brush up my knowledge using some online resources.

I really appreciate your assistance.

Tmarikle


Why do you want to name the script as '' yourscript.sh '' ?

You could just name 'yourscript' . I don't know the necessity of the '' .sh ''

Please tell me.

My default shell is the 'bash' .
[nissanka@c83-250-111-20 ~]$ echo $SHELL
/bin/bash
[nissanka@c83-250-111-20 ~]$