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Full Discussion: Script to fill the file system mount with empty files to desired size
Homework and Emergencies Emergency UNIX and Linux Support Script to fill the file system mount with empty files to desired size Post 302731331 by otheus on Wednesday 14th of November 2012 08:29:58 PM
Old 11-14-2012
Might be simpler to let awk do the calculation, and let the script's input parameters be used in the normal sense.
This code looks longer, because I added lots of checking, but the functional part is more concise.
Code:
usage() { 
  echo "Usage: $0 mountpoint threshold "
  echo "   where threshold is 1 to 100"
}

# $1 is the mountpoint
# $2 is the threshold (whole number, 1 to 100)

if [ ! -d $1 ]; then
  usage; exit 2;
fi
if [ $2 -lt 1 -o $2 -gt 100 ] ;then
  usage; exit 2;
fi

df -k $1 |
 awk -v t=$2     'NR==2  { print int($4 * (t-int($5))/100 ); }'  |
{
# The pipe-brace here in ksh isn't necessary, but in other sh-based shells, it is.
# 
read blocks
if [ -z $blocks -o $blocks -le 0 ] ; then
   echo "Error: Disk is already filled above threshold!"
   exit 1
else
   dd if=/dev/zero of=$1/.fillfile.$$ bs=1k count=$blocks
   exit $?
fi
}

I gave this a test under Darwin with bash.

You could make a really simple script with this:
Code:
df -k $1 |  awk -v t=$2  'NR==2  { print int($4 * (t-int($5))/100 ); }'  |
{ read blocks;  dd if=/dev/zero of=$1/.fillfile.$$ bs=1k count=$blocks }

If blocks is negative (your threshold is too low), dd will report an error. If it's 0, it will essentially do nothing (but still create the file).

You could do it for ALL mounted filesystems with this modification:
Code:
df -k |  awk -v t=$2  'NR>1  { print $NF,int($4 * (t-int($5))/100 ); }'  |
while read mountpoint blocks;  dd if=/dev/zero of=$mountpoint/.fillfile.$$ bs=1k count=$blocks ; done

Last edited by otheus; 11-14-2012 at 09:36 PM.. Reason: correction
This User Gave Thanks to otheus For This Post:
chandu123
 

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LEARN ABOUT CENTOS

mount.nfs

MOUNT.NFS(8)						      System Manager's Manual						      MOUNT.NFS(8)

NAME

       mount.nfs, mount.nfs4 - mount a Network File System

SYNOPSIS

       mount.nfs remotetarget dir [-rvVwfnsh ] [-o options]

DESCRIPTION

       mount.nfs is a part of nfs(5) utilities package, which provides NFS client functionality.

       mount.nfs  is  meant to be used by the mount(8) command for mounting NFS shares. This subcommand, however, can also be used as a standalone
       command with limited functionality.

       mount.nfs4 is used for mounting NFSv4 file system, while mount.nfs is used to mount NFS file systems versions 3 or 2.   remotetarget  is  a
       server share usually in the form of servername:/path/to/share.  dir is the directory on which the file system is to be mounted.

OPTIONS

       -r     Mount file system readonly.

       -v     Be verbose.

       -V     Print version.

       -w     Mount file system read-write.

       -f     Fake mount. Don't actually call the mount system call.

       -n     Do not update /etc/mtab.	By default, an entry is created in /etc/mtab for every mounted file system. Use this option to skip making
	      an entry.

       -s     Tolerate sloppy mount options rather than fail.

       -h     Print help message.

       nfsoptions
	      Refer to nfs(5) or mount(8) manual pages.

NOTE

       For further information please refer nfs(5) and mount(8) manual pages.

FILES

       /etc/fstab	 file system table

       /etc/mtab	 table of mounted file systems

SEE ALSO

       nfs(5), mount(8),

AUTHOR

       Amit Gud <agud@redhat.com>

								    5 Jun 2006							      MOUNT.NFS(8)
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