Date: Mon, 17 Mar 2003 15:09:47 -0500 From: Edmond Baroud <SoHo@admin.fido.ca> To: Tom Parquette <tparquet@twcny.rr.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Shell scripting questions Message-ID: <20030317150947.6570b8a7.SoHo@admin.fido.ca> In-Reply-To: <3E762419.3040900@twcny.rr.com> References: <3E762419.3040900@twcny.rr.com>
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On Mon, 17 Mar 2003 14:38:01 -0500
Tom Parquette <tparquet@twcny.rr.com> wrote:
> I've been looking through some basic shell books, and some online
> resources, that I have but I'm not finding the answer.
> Or maybe I just don't recognize the answer when I see it...
>
> I'm building a schell script that will backup my systems to CD-ROM. Or
> DVD when I can talk my wife into a burner. :-)
>
> I'm stuck on two items:
> 1) Since my tar files CAN exceed the capacity of a CD-ROM, I want to
> check in the script if I have to call split.
> The closest I can come to determining the size of the output file from
> tar (e.g.ad0s1a.tgz) is: file_size=`du -k /tmp/ad0s1a.tgz`.
> The problem I have is, while this gives me the result in number of K
> blocks, it also returns the file name and directory. I don't know how
> to get JUST the number of K blocks so I can do a numeric compare against
> 700m.
file_size=`du -k /tmp/ad0s1a.tgz|awk '{print $1}'`
num_compare=`expr 700000 - $file_size`
>
> 2) I have a function written that will tar/gzip the filesystem then
> split it into pieces that will be turned into .iso files that will be
> fed to burncd. I would like to capture the output of commands (e.g. ls
> -l /tmp/ad0s1a.*) into a "table" that I can examine to determine what
> was output by the split command so I know what mkisofs commands, and how
> many, I have to build/execute. Example: If I end up with a
> ad0s1a.tgz.aa, ab, and ac from split, I know I have to do mkisofs' for 3
> files.
I don't know what your split command returns but I beleive u can put that in a loop.
>
> I also hope to use the same technique for determining what filesystems
> I have to backup in the first place. e.g. If I do a df command I want
> to pull out the filesystem name and what mountpoint it is on. The
> mountpoint is important to me because I do not want to back up some
> filesystems. e.g. I do not want to backup /tmp.
I think that all u're missing here is the "awk" command.
man awk ;)
fs=`df|awk '{print $6}'|grep -vi mounted`
for i in $fs
do
if [ $i = "/" ]
then
backup_script args
elseif [ $i = "/etc" ]
backup_script args
else
elseif [ $i = "/tmp" ]
echo "I'm not backing up /tmp !"
else
do something
fi
done
>
> TIA.
> Cheers...
hope this helps.
Ed.
>
>
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--
Edmond Baroud
UNIX Systems Admin mailto:SoHo@admin.fido.ca
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