Need a shell script to find 0 byte files in 5 servers Post: 302913676

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Top Forums UNIX for Dummies Questions & Answers Need a shell script to find 0 byte files in 5 servers Post 302913676 by bakunin on Tuesday 19th of August 2014 07:44:21 AM

08-19-2014

Registered User

Quote:

Originally Posted by ChandruBala73

I have toatally 5 unix servers in which many applications are working

I need to set a trap to identify 0 byte files if any are created proactively.

For example:

Code:

find /apps/fresco/ -mtime 1 -size 0c -print >> zerobytefile.log

this command will find zero byte file for last 1 day (no need to check entire directory every day and this is for /apps/fresco folder which will cover all the interfaces and will apply for all my servers)

2) then filter this log file for any data and if any data is present then raise a trap.

First off: welcome to the forum and i hope you enjoy the ride. Please do us (and yourself) a favour and use as little text markup as possible. For any code, terminal output or similar data use "CODE"-tags, which let stand out yor text nicely. I have taken the liberty and replaced this in the quoted text above. Compare yourself. Thanks for your consideration.

To your problem: you alread constructed a command to identify such files. Instead of the ">>" operator you used you should use ">" to create this file anew every day. Establish passwordless login through ssh for some user (likely root, but any other user with sufficient rights will do) at each of the target machines. Put this command into a loop on any system, like this (only a sketch):

Code:

# cat list_of_hosts_to_monitor
hostA
hostB
hostC
hostD

# cat mymonitoring.sh
#! /bin/ksh

typeset fHosts="/path/to/list_of_hosts_to_monitor"
typeset fOut="/path/to/output/dir"
typeset chUser="root"          # or something else
typeset chHost=""

while read chHost ; do
     ssh -o 'BatchMode = yes' "${chUser}@${chHost}" "find /apps/fresco/ -mtime 1 -size 0c -print" > "${fOut}/${chHost}.log"
done < "${fHosts}"

exit 0

This gives you a file for each host (named like the hostname+".log") locally (in the directory $fOut points to) which you can examine separately.

Then set up a cron job to run this script daily.

I hope this helps.

bakunin

bakunin

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makedev

MAKEDEV(8)						      System Manager's Manual							MAKEDEV(8)

NAME

       MAKEDEV - makes system special files

SYNOPSIS

       /dev/MAKEDEV [argument] [device-name?...]

DESCRIPTION

       The MAKEDEV shell script is normally used to install special files. It resides in the /dev directory, the normal location of special files.
       Arguments to MAKEDEV are usually of the form device-name?  where device-name is one of the supported devices listed in  Section	7  of  the
       Reference  Pages  and ?	is a logical unit number. The argument operand is one of the following special arguments that create assorted col-
       lections of devices: Creates all standard device files for all systems.

	      Standard devices for Alpha systems (in the order they are created) are as follows: klog, kcon, kbinlog, kmem,  mem,  null,  vmzcore,
	      console,	ws0,  mouse0,  keyboard0, tty, pty0, pty1, ptmx, cam, audit, prf, pfcntr, zero, snmpinfo, lockdev, and sysdev0.  Creates a
	      set of 16 LAT device special files, one for each LAT terminal device. The n specifies the set option. The set option range is  0	to
	      38.  Specifying  lat38 creates 12 LAT device special files.  Creates groups of pseudoterminal device special files, as follows: Cre-
	      ates pty0 to pty22.  Creates pty23 to pty45.  Creates pty46 to pty56.  Creates pty57 to pty64.  Creates  pty65  to  pty72.   Creates
	      pty73 to pty80.  Creates pty81 to pty88.	Creates pty89 to pty96.  Creates pty97 to pty101.

	      The # specifies the group of pseudoterminal device special files created.  Creates a group of packet filter device special files, as
	      follows: Creates pfilt0 to pfilt63.  Creates pfilt0 to pfilt63.  Creates pfilt0 to pfilt127.  Creates pfilt0 to  pfilt255.   Creates
	      pfilt0  to  pfilt511.   Creates  pfilt0 to pfilt1023.  Creates pfilt0 to pfilt2047.  Creates pfilt0 to pfilt3071.  Creates pfilt0 to
	      pfilt4095.

	      The # specifies the number of ppacket filter device special files created.  Creates those devices specific to the local site.   This
	      request  causes the shell file /dev/MAKEDEV.local to be executed.  This file must exist prior to using the local argument. Site spe-
	      cific commands, such as those used to setup dialup lines as ttyd? and to create device special files  for  all  non-Compaq  devices,
	      should be included in this file.

       Because all devices are created using mknod(8) this shell script is useful only to the superuser.

NOTES

       The  MAKEDEV  script  installs files in the current working directory. Although device special files can be located anywhere on the system,
       they are usually created in the /dev directory, since this is where most applications expect to find them.

       Refer to the dsfmgr(8) reference page for information on the Device Special File Manager program.

ERRORS

       Either self-explanatory, or generated by one of the programs called from the script.  Use sh -x MAKEDEV in case of trouble.

SEE ALSO

       Commands: config(8), dsfmgr(8), mknod(8)

       Interfaces: intro(7), packetfilter(7), pty(7)

																	MAKEDEV(8)

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