Bash script to get free space for a specific mount point

Hi,

Here is a script we wrote to check free space on a mount point passed in parameter. If the mount point is nfs type, the script writes and deletes a test file to validate the access.

The free space percentage is recalculated since the df command output.

Thank's for your returns.

Matthieu

#!/bin/bash
#
# This script return df result for the mount point
# and check if writing on it is possible (NFS only)
# support: support@sensorfactory.freshdesk.com

if [ $# != 1 ]
  then
    echo "<prtg>"
        echo "   <error>1</error>
   <text>Please specify a mount point</text>"
        echo "</prtg>"
  exit 1
fi


# Data collecting
data=($(df -PkTm | grep -w $1 | awk '{ print $2,$3,$4,$5,$6 }'))

# Compute real free percent space
freep=$(awk "BEGIN { pc=100*${data[3]}/${data[1]}; i=int(pc); print (pc-i<0.5)?i:i+1 }")

# Check NFS writing
if [ "${data[0]}" = "nfs" ]; then
	touch "$1/test"
	if [ $? -ne 0 ]; then
	    echo "<prtg>"
            echo "   <error>1</error>
   	<text>Unable to write on $1</text>"
            echo "</prtg>"
	else
	   rm -f "$1/test"
	fi
fi

# Output

echo "<prtg>"

echo "<result>
<channel>Free%</channel>
<value>$freep</value>
<Unit>Percent</Unit>
<LimitMinWarning>12</LimitMinWarning>
<LimitMinError>10</LimitMinError>
<LimitMode>1</LimitMode>
</result>"

echo "<result>
<channel>Total</channel>
<value>${data[1]}</value>
<CustomUnit>MBytes</CustomUnit>
</result>"

echo "<result>
<channel>Used</channel>
<value>${data[2]}</value>
<CustomUnit>MBytes</CustomUnit>
</result>"

echo "<result>
<channel>Free</channel>
<value>${data[3]}</value>
<CustomUnit>MBytes</CustomUnit>
</result>"

echo "</prtg>"




exit 0