bash script

tslinux · 08-03-2003, 02:32 PM

what is the best way to increment a filename in a bash script so that the filename is different each time the script is run and file is saved? ie. filename+1, filename+2, etc. example used in tar backup.

slapNUT · 08-03-2003, 04:43 PM

filename` date|awk 'OFS="."{print $2,$3,$6,$4}'`
Makes a filename like this:
filenameAug.3.2003.16:46:02

tslinux · 08-03-2003, 09:54 PM

Thanks, dude (or dudette?)

I really appreciate it.
And, I really do plan on learning this stuff.

Thanks.

Tinkster · 08-03-2003, 11:05 PM

Just a suggestion ... if you replace
date
in the script with
date +%Y%m%d-%H%M%S
you save yourself the awk'ing
and get a more easily (logically)
sortable set of filenames... and save
yourself the ":" in filenames, which
scp, for instance, doesn't like :}

Cheers,
Tink

slapNUT · 08-04-2003, 11:06 PM

Yeah Tinksters is better. Except for that "weird European, puttin the year first" stuff. :P

Maybe:
date +%m%d%Y-%H%M%S

Hko · 08-05-2003, 11:45 AM

That's not European.
In Europe (well, at least in The Netherlands) we use dd-mm-yyyy.

However, when sorting alphabetically yyyy-mm-dd is nicer I think.

Tinkster · 08-05-2003, 04:01 PM

Quote:

Originally posted by slapNUT
Yeah Tinksters is better. Except for that "weird European, puttin the year first" stuff. :P

Maybe:
date +%m%d%Y-%H%M%S

date +%Y%m%d-%H%M%S
That's not European, that's logical :} ... think
about it for a second. Once you have a date
range of more than a year it's stupid to sort
by months first. "My way" is also the way dates
are represented internally in all major SQL
databases, too.

Cheers,
Tink

slapNUT · 08-05-2003, 07:28 PM

It was a joke!

But since you brought it up; you don't have to put the year first in the file name to sort by the year.

Code:

From man sort:
       -k, --key=POS1[,POS2]
              start a key at POS1, end it at POS 2 (origin 1)

That lets you sort filenames starting from any position you choose.

Tinkster · 08-05-2003, 07:33 PM

Yes, you could ... or you could stick with the
logical, straightforward approach and then use
sort if you need something different ;)

Cheers,
Tink

tslinux · 08-05-2003, 08:06 PM

you guys can end this, now.

slapNUT · 08-05-2003, 11:58 PM

Quote:

Posted by Tinkster
Yes, you could ...

Thank you benevolent <cough> guru. I'm done.