Estimate the folder size without unzipping zip file

Estimate the folder size without unzipping zip file

Many times, we may face disk or mount point running out of the storage during unzipping the tar or zip file. We need to estimate the space required for unzipping the file.

Below the is the sample shell script which will estimates the space requirement for the unzipping the zip files or patches.

Notes: 

This is the best practice for the all kind of patching activities, OH patching, APPS patching. DBAs has to make sure adequate space is available before the patching activity.

Shell script: 

folder_size_estimation.sh 

#!/bin/ksh

#===============================================================================================#

# Name          : folder_size_estimation.sh                                                     #

# Written by    : Mallik                                                                        #

# Purpose       : This script will Estimate the folder size without unzipping zip file          #

# Pending       : NONE                                                                          #

# Creation Date : 14-MAR-2019                                                                   #

# Version       : 1                                                                             #

# ==============================================================================================#

TODAY_DATE=`date +%d%m%Y_%H%M%S`

find /home/mramadur/patches -name "p*.zip" -print > /home/mramadur/patches/zipfiles.lst

totalsize=0

div=1073741824

for zipfiles in `cat /home/mramadur/patches/zipfiles.lst`

do

size=`unzip -l $zipfiles | tail -1 | awk'{ print $1 }'`

totalsize=`expr "$size" + "$totalsize"`

done

TS=$(echo "scale=2; $totalsize/$div" |bc)

echo $TS GB is needed to unzip the patches

Regards,

Mallik