Login or Register to Ask a Question and Join Our Community

Sponsored Content
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
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

bash script working for small size files but not for big size files.

Hi, I have one file stat. Stat file contents are as follows: for example. H50768020040913,00260100,507680,13,0000000643,0000000643,00000,0000 H50769520040808,00260100,507695,13,0000000000,0000000000,00000,0000 H50770620040611,00260100,507706,13,0000000000,0000000000,00000,0000 Now i... (1 Reply)
Discussion started by: davidpreml
1 Replies

2. UNIX for Dummies Questions & Answers

how to mount a file system of a remote machine to local file system

Hi friends, In my case, there are serveral PCs running Linux in a LAN. I would like to to mount the directory /A_river of machine-A to the file system of another machine machine-B so that I can access files in that directory. I do not know how to do this. The situation is complicated by... (2 Replies)
Discussion started by: cy163
2 Replies

3. UNIX for Dummies Questions & Answers

Trying to empty file using > but the file size increasing when next append

AIX 5.3 / KSH I have a Java application which creates a log file a.log. I have a KSH script which does the following action cp a.log /directory2/b.log > a.log After this the file size goes to 0 as per "ls -l" Then next time when the application writes into this file, the file size... (4 Replies)
Discussion started by: firdousamir
4 Replies

4. Shell Programming and Scripting

Unix file empty.. but size is greater than zero??/

Hi, I have a file by redirecting some contents in unix shell. Even when there is no content that is being redirected, the file size still shows greater than zero. but even if there is no matching pattern the file APPRES has size greater than 0bytes. awk -f AA.awk $logfile>APPRES... (3 Replies)
Discussion started by: justchill
3 Replies

5. Solaris

Directory size larger than file system size?

Hi, We currently have an Oracle database running and it is creating lots of processes in the /proc directory that are 1000M in size. The size of the /proc directory is now reading 26T. How can this be if the root file system is only 13GB? I have seen this before we an Oracle temp file... (6 Replies)
Discussion started by: sparcman
6 Replies

6. Shell Programming and Scripting

Compare columns and rows with template, and fill empty slots.

Hi, I'm working on a script that will take the contents of a file, that is in a row and column format, and compare it to a arrangment file. Such that if there is any or all blanks in my content file, the blank will be filled with a flag and will retain the row and column configuration. Ex. ... (2 Replies)
Discussion started by: hizzle
2 Replies

7. Shell Programming and Scripting

Script to check file system size

Dears, the output of this command df -h | tr -s ' ' | cut -f5 -d' ' is capacity 24% 0% 0% 0% 0% 1% 0% 24% 24% 0% 93% 1% (4 Replies)
Discussion started by: xxmasrawy
4 Replies

8. Shell Programming and Scripting

Symbolic link to an empty file shows size 2

Hi, I have created an empty file and a symbolic link to a file. But when I issue the following commands, I am getting the output 2. stat -c "%s" linkfile du -hb linkfile Why this is happening? (4 Replies)
Discussion started by: royalibrahim
4 Replies

9. Shell Programming and Scripting

Script which fill data in XML file

Hello, I need help for writing a script that fills already generated xml file with data from oracle database and random sequences. For example if we have the following tags: <ns1:message> <ns1:messageId> </ns1:messageId> <ns1:languageCode> </ns1:languageCode>... (10 Replies)
Discussion started by: zb99
10 Replies

10. HP-UX

how to mount a file system from a solaris server into an hp-ux system

Hi all I wonder if its possible to mount on a hp-ux server a file system that was previously mounted on a solaris 10 server. The LUN is on NetApp stoarge. The problem on hp-ux I cannot do pvcreate on the lun (disk) because contains data. Any help will be appreciated FR (2 Replies)
Discussion started by: fretagi
2 Replies

LEARN ABOUT X11R4

mkfs.minix

MKFS.MINIX(8)						       System Administration						     MKFS.MINIX(8)

NAME

       mkfs.minix - make a Minix filesystem

SYNOPSIS

       mkfs.minix [options] device [size-in-blocks]

DESCRIPTION

       mkfs.minix creates a Linux MINIX filesystem on a device (usually a disk partition).

       The device is usually of the following form:

	      /dev/hda[1-8] (IDE disk 1)
	      /dev/hdb[1-8] (IDE disk 2)
	      /dev/sda[1-8] (SCSI disk 1)
	      /dev/sdb[1-8] (SCSI disk 2)

       The device may be a block device or a image file of one, but this is not enforced.  Expect not much fun on a character device :-).

       The  size-in-blocks parameter is the desired size of the file system, in blocks.  It is present only for backwards compatibility.  If omit-
       ted the size will be determined automatically.  Only block counts strictly greater than 10 and strictly less than 65536 are allowed.

OPTIONS

       -c, --check
	      Check the device for bad blocks before creating the filesystem.  If any are found, the count is printed.

       -n, --namelength length
	      Specify the maximum length of filenames.	Currently, the only allowable values are 14 and 30 for file system versions 1 and 2.  Ver-
	      sion 3 allows only value 60.  The default is 30.

       -i, --inodes number
	      Specify the number of inodes for the filesystem.

       -l, --badblocks filename
	      Read the list of bad blocks from filename.  The file has one bad-block number per line.  The count of bad blocks read is printed.

       -1     Make a Minix version 1 filesystem.  This is the default.

       -2, -v Make a Minix version 2 filesystem.

       -3     Make a Minix version 3 filesystem.

       -V, --version
	      Display version information and exit.  The long option cannot be combined with other options.

       -h, --help
	      Display help text and exit.

EXIT CODES

       The exit code returned by mkfs.minix is one of the following:

       0      No errors

       8      Operational error

       16     Usage or syntax error

SEE ALSO

       fsck(8), mkfs(8), reboot(8)

AVAILABILITY

       The mkfs.minix command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

util-linux							     June 2015							     MKFS.MINIX(8)
All times are GMT -4. The time now is 07:59 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy