[SOLVED] writing a script

kenny53067 · 07-23-2011, 05:11 PM

Quote:

Originally Posted by grail

markush's response is the correct one here. Try it for yourself and see what happens. Create three files starting with the letter g and see what
happens when you issue the command.

To do this won't I have to create some g files? Every time I try to write code and try to execute I always get this cannot access: no such file or directory.

Tinkster · 07-23-2011, 05:13 PM

Quote:

Originally Posted by kenny53067

I understand this 100%
I'm trying to understand what things do so that I will be able to write code.

example: I didn't know that ls Memo would not work, but ls Memo? would list all files with Memo in the name. Now I know.

Ummm - that's actually wrong.

Code:

$ ls
Memo1  Memo10  Memo11  Memo12  Memo13  Memo14  Memo2  Memo3  Memo4

Code:

$ ls Memo?
Memo1  Memo2  Memo3  Memo4

Code:

$ ls Memo??
Memo10  Memo11  Memo12  Memo13  Memo14

Cheers,
Tink

kenny53067 · 07-23-2011, 05:18 PM

Quote:

Originally Posted by markush

Hello,

@kenny53067, it seems you're posting from a Windows-computer. If you don't have Linux running, you should either boot a live-CD or use for example Virtualbox and install a Linux-distribution as a virtual machine. Then you can try out the code.

Markus

I have a VMware player and it has Fedora. There are no files on it so it is hard to run a script. As a matter of fact I have the terminal open the same time as this window.

Not to get off the subject, but is there a way to make the virtual machine stop turning off when is idle for to long?

kenny53067 · 07-23-2011, 05:25 PM

Quote:

Originally Posted by Tinkster

Ummm - that's actually wrong.

Code:

$ ls
Memo1  Memo10  Memo11  Memo12  Memo13  Memo14  Memo2  Memo3  Memo4

Code:

$ ls Memo?
Memo1  Memo2  Memo3  Memo4

Code:

$ ls Memo??
Memo10  Memo11  Memo12  Memo13  Memo14

Cheers,
Tink

Let me see if I understand, $ ls This list all files?

$ ls Memo? only list Memo with single digit numbers?

$ ls Memo?? only list Memo with double digit numbers?

Is this correct?

markush · 07-23-2011, 05:31 PM

You should in a terminal execute the following command (in your home-directory where you have write-permissions!!!)

Code:

for files in {1..20}; do touch Memo$files; done

this will create the files Memo1 up to Memo20, use them for some exercises.

Markus

markush · 07-23-2011, 05:33 PM

Quote:

Originally Posted by kenny53067

Let me see if I understand, $ ls This list all files?

$ ls Memo? only list Memo with single digit numbers?

$ ls Memo?? only list Memo with double digit numbers?

Is this correct?

No, this is not correct, the questionmark means any single character, it would also match for example "Memos".

Markus

Tinkster · 07-23-2011, 05:34 PM

Quote:

Originally Posted by kenny53067

Let me see if I understand, $ ls This list all files?

Is this correct?

Yep.

Quote:

Originally Posted by kenny53067

$ ls Memo? only list Memo with single digit numbers?

Is this correct?

Almost. It will work w/ ANY character, not just digits.

Quote:

Originally Posted by kenny53067

$ ls Memo?? only list Memo with double digit numbers?

Is this correct?

See one above.

Cheers,
Tink

kenny53067 · 07-23-2011, 05:49 PM

Quote:

Originally Posted by markush

You should in a terminal execute the following command (in your home-directory where you have write-permissions!!!)

Code:

for files in {1..20}; do touch Memo$files; done

this will create the files Memo1 up to Memo20, use them for some exercises.

Markus

Done, now I have Memo1-Memo20 files. Why is there a Memo1 and a Memo1~

markush · 07-23-2011, 05:51 PM

Did you edit it? the vim editor for example creates a backupfile once you've made changes to a file, the backupfile has a "~" at it's end.

Markus

kenny53067 · 07-23-2011, 06:03 PM

Quote:

Originally Posted by markush

Did you edit it? the vim editor for example creates a backupfile once you've made changes to a file, the backupfile has a "~" at it's end.

Markus

So these are the same file, one is the original and one is a back-up.

Tinkster · 07-23-2011, 06:52 PM

Quote:

So these are the same file, one is the original and one is a back-up.

If one is the original and the other a back-up they can't be
the same, technically speaking ;}

Cheers,
Tink

markush · 07-24-2011, 12:59 AM

Quote:

Originally Posted by kenny53067

So these are the same file, one is the original and one is a back-up.

The backup is made in the moment when you "could" have changed the file, which means you changed the text and wrote the changed file to the disk.

So both files can have the same content, but they are not the same like a symlink.

Markus

catkin · 07-24-2011, 10:59 AM

ls does not list all files and directories, it does not list "hidden" files, that is those with first character .

To list all files and directories use ls -a