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Re: Generating unique file names

From: Chris F.A. Johnson
Subject: Re: Generating unique file names
Date: Sun, 13 May 2007 17:45:46 -0400
User-agent: slrn/ (Linux)

On 2007-05-13, matte wrote:
>    I am doing a simple [1]backup Bash script that creates a backup archive of 
> a
>    folder (or file) I am working on.

   Where is the script? The link below is to the forums as a whole.

> I want to have snapshaps all saved to one
>    directory. To ensure unique name, I am currently appending the date and 
> time
>    to "MyArcName_data_time." But this creates a long and ugly name. I'd like
>    either something cleaner like a unique number appended (based on total 
> files
>    in directory), or some random temp filename generator function that I don't
>    yet know about.
>    The count would be sufficient, as each folder will always hold ONLY these
>    archives, and no hidden files.
>    Thus, my directory would be:
>    myArcName_1.tar.gz
>    myArcName_2.tar.gz
>    myArcName_3.tar.gz
>    ...
>    iF there's some bash function for this, groovy. If not, i just need to know
>    how to count the directories from inside my script.
>    Thanks in advance

   I use this in one script (leave out the date if you prefer):

date=$(date +%Y-%m-%d)

while [ -f "$tarfile" ]
  n=$(( ${n:=0} + 1 ))

   Chris F.A. Johnson                      <http://cfaj.freeshell.org>
   Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)

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