File Size In A Bash Script.

I would like to run a small script from Cron, to monitor certain file
size and then take an action.

Something like

$Filename=
$Filepath=

$size=

If $size= {certain size}

Action here.

I have no idea how to capture a file size in bash, any suggestions?

I read somewhere that we can use ls -s, but how to capture that in the
script I have no idea.

Thank you.

On Sun, 18 Jul 2004 15:00:10 -0700, Adam wrote:
> I would like to run a small script from Cron, to monitor certain file
> size and then take an action.
>
> Something like
>
> $Filename=
> $Filepath=
>
> $size=
>
> If $size= {certain size}
>
> Action here.
>
> I have no idea how to capture a file size in bash, any suggestions?

stat -c %s /etc/profile

> I read somewhere that we can use ls -s, but how to capture that in the
> script I have no idea.

All sorts of ways, for instance

set $(ls -s /etc/profile)
echo size is $1 name is $2

You do need to take time to play around here
http://www.tldp.org/LDP/abs/html/index.html

In article <sfslf0lqca8smppk8p86bf70f62ebp2t7q@4ax.com>, Adam wrote:
>I would like to run a small script from Cron, to monitor certain file
>size and then take an action.

_Normally_ that would be done with the 'find' command with the '-size'
option.

>I have no idea how to capture a file size in bash, any suggestions?

Go to the Linux Documentation Project, and get two magnificant books
for free. Try http://tldp.org/guides.html and what you are
looking for is

Bash-Beginners-Guide
abs-guide

Another good document to start with is Bash-Prog-Intro-HOWTO although
it's nearly four years old.

>I read somewhere that we can use ls -s, but how to capture that in the
>script I have no idea.

-s gives the size in blocks - you may want to get the actual size in
bytes by using the ls -l command. As to how:

for FILE in * ; do
SIZE=`/bin/ls -l $FILE | /bin/awk '{ print $5 }'`
if [ $SIZE -eq "12345" ] ; then
[Action here]
fi
done

but watch those quotes. The ones around the { print $5 } are the
regular single quotes (next to the Enter key), while the one following
the equal sign (and end of that line) are back-tics (above the Tab key).
They are used when you want to capture the output of a command. Thus,

SIZE=`ls -l /var/dev/foo`

would take the output of the command 'ls -l /var/dev/foo' and stick that
into variable SIZE. To view the _contents of variable SIZE you might to

echo $SIZE

Also, please remember that cron usually has no pre-defined PATH or other
environmental variables. Notice how I used the full pathname to the
common commands 'ls' and 'awk'. Actually, that's a good practice to
get into when writing _any_ scripts.

Hope this helps,

Old guy

In article <slrncfokl7.qdn.ibuprofin@atlantis.phx.az.us>
ibuprofin@painkiller.example.com (Moe Trin) wrote:

>In article <sfslf0lqca8smppk8p86bf70f62ebp2t7q@4ax.com>, Adam wrote:
>>I would like to run a small script from Cron, to monitor certain file
>>size and then take an action.
>
>_Normally_ that would be done with the 'find' command with the '-size'
>option.
>
>>I have no idea how to capture a file size in bash, any suggestions?
>
>Go to the Linux Documentation Project, and get two magnificant books
>for free. Try http://tldp.org/guides.html and what you are
>looking for is
>
> Bash-Beginners-Guide
> abs-guide
>
>Another good document to start with is Bash-Prog-Intro-HOWTO although
>it's nearly four years old.
>
>>I read somewhere that we can use ls -s, but how to capture that in the
>>script I have no idea.
>
>-s gives the size in blocks - you may want to get the actual size in
>bytes by using the ls -l command. As to how:
>
> for FILE in * ; do
> SIZE=`/bin/ls -l $FILE | /bin/awk '{ print $5 }'`
> if [ $SIZE -eq "12345" ] ; then
> [Action here]
> fi
> done
>
>but watch those quotes. The ones around the { print $5 } are the
>regular single quotes (next to the Enter key), while the one following
>the equal sign (and end of that line) are back-tics (above the Tab key).
>They are used when you want to capture the output of a command. Thus,
>
> SIZE=`ls -l /var/dev/foo`
>
>would take the output of the command 'ls -l /var/dev/foo' and stick that
>into variable SIZE. To view the _contents of variable SIZE you might to
>
> echo $SIZE
>
>Also, please remember that cron usually has no pre-defined PATH or other
>environmental variables. Notice how I used the full pathname to the
>common commands 'ls' and 'awk'. Actually, that's a good practice to
>get into when writing _any_ scripts.
>
>Hope this helps,

It did, more than I have ever expected.

Thank you very much.

In article <slrncflt97.ff3.BitTwister@wb.home.invalid>
Bit Twister <BitTwister@localhost.localdomain> wrote:

>On Sun, 18 Jul 2004 15:00:10 -0700, Adam wrote:
>> I would like to run a small script from Cron, to monitor certain file
>> size and then take an action.
>>
>> Something like
>>
>> $Filename=
>> $Filepath=
>>
>> $size=
>>
>> If $size= {certain size}
>>
>> Action here.
>>
>> I have no idea how to capture a file size in bash, any suggestions?
>
>stat -c %s /etc/profile
>
>> I read somewhere that we can use ls -s, but how to capture that in the
>> script I have no idea.
>
>All sorts of ways, for instance
>
>set $(ls -s /etc/profile)
>echo size is $1 name is $2
>
>You do need to take time to play around here
>http://www.tldp.org/LDP/abs/html/index.html

Thank you for the pointers.