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Get file size in c shell script?

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# 1  
Old 09-24-2005
Get file size in c shell script?
Hi,
I want to use an 'if statement' that will check if a certian file is greater in size than a certain value given by the user, but cannot get it to work. Do you have any ideas how this can be done?
Your help is appreciated!
# 2  
Old 09-25-2005
Quote:
Originally Posted by Dado
Hi,
I want to use an 'if statement' that will check if a certian file is greater in size than a certain value given by the user, but cannot get it to work. Do you have any ideas how this can be done?
Your help is appreciated!
Cannot get it to work ? Post the script that you have.
# 3  
Old 09-25-2005
Here is what I used
if (size +10c filename)
I used this to search for files larger than 10kb, but it has errors when I run it.
# 4  
Old 09-26-2005
MySQL
how u feel this
Quote:
if (size +10c filename)
is going to work?

To my understanding, you need to get the file size by something like:

Code:
size=`ls -l $filename | awk '{print $5}'`
allowed_size=`expr ($size + 10240)/1024`
if ( $allowed_size > something) then
....

regards,
rishi
# 5  
Old 09-26-2005
Quote:
Originally Posted by RishiPahuja
how u feel this

is going to work?

To my understanding, you need to get the file size by something like:

Code:
size=`ls -l $filename | awk '{print $5}'`
allowed_size=`expr ($size + 10240)/1024`
if ( $allowed_size > something) then
....

regards,
rishi
If you have stat, then an improvement for

Code:
size=`ls -l $filename | awk '{print $5}'`

Code:
size=`stat -c %s $filename`

or much better

Code:
size=$(stat -c %s $filename)

vino
# 6  
Old 09-26-2005
Quote:
Originally Posted by Dado
if (size +10c filename)
I used this to search for files larger than 10kb, but it has errors when I run it.
Read the man pages of find.

Code:
       -size n[bckw]
              File uses n units of space.  The units are  512-byte  blocks  by
              default  or  if b follows n, bytes if c follows n, kilobytes
              if k follows n, or 2-byte words if w follows  n.   The  size
              does  not  count  indirect  blocks,  but it does count blocks in
              sparse files that are not actually allocated.

Code:
find /dir/to/search -size +10k

will give you all files above 10kb.

size will split up the data as follows

Code:
   text    data     bss     dec     hex filename
 341349   10772      16  352137   55f89 file.ext

We can see that 341349+10772+16 does give 352137. But doing an ls -l file.ext gives
Code:
-rwxrwx---    1 xxxxx  xxxxx    505977 Sep 22 22:46 file.ext

which gives a file size of 505977.

Hence size will not give you the actual size of the file.

Look at this article and this man page. It explains what size takes into consideration.

vino
Last edited by vino; 09-26-2005 at 05:45 AM..
# 7  
Old 09-26-2005
Filesize in if
Quote:
Originally Posted by Dado
Hi,
I want to use an 'if statement' that will check if a certian file is greater in size than a certain value given by the user, but cannot get it to work. Do you have any ideas how this can be done?
Your help is appreciated!
----------------------
Hi,
We can use following command to find out size of file and assign it to variable and then we can use it in if statment for compare

ab=`ls -l $1 | awk '{print $5}'`

Where $1 is file name for which to find out size.

Regards
Vinod
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