Shell Programming and Scripting

Hi there,

Im new in the scripting world and ran into trouble yesterday. I want to make a small script that runs in crontab checking folders. If the folder size is greater than 10 (or what I set the variable to) then send a mail with a warning.

#!/bin/sh
set -x
A=8
C=`du -skh /share/MD0_DATA/Qmusic |cut -c 1-3`
echo $C
echo $A

if ('$C -ge $A') ##If C which is folder size 9,6 is larger than $A

then

echo "Qmusic quota has reached maximum - size is $C"
else
echo "Qmusic is using $C storage"

fi

## When i run the script this is my output:

[/] # ./quota.sh
+ A=8
++ du -skh /share/MD0_DATA/Qmusic
++ cut -c 1-3
+ C=9.6
+ echo 9.6
9.6
+ echo 8
8
+ '$C -ge $A'
./quota.sh: line 10: $C -ge $A: command not found
+ echo 'Qmusic is using 9.6 storage'
Qmusic is using 9.6 storage


It seems that the problem is the if statement. I tried with varius " ' [ etc but without any luck. What am I missing in the if statement?

The if statement should looks like:

Code:

if [ "$C" -ge "$A" ]

Regards

Hi Franklin


thanks for your time

changing the if statement brought new problems

[/] # ./quota.sh
+ A=8
++ cut -c 1-3
++ du -skh /share/MD0_DATA/Qmusic
+ C=9.6
+ echo 9.6
9.6
+ echo 8
8
+ '[' 9.6 -ge 8 ']'
./quota.sh: line 11: [: 9.6: integer expression expected
+ echo 'Qmusic is using 9.6 storage'
Qmusic is using 9.6 storage

Oh just realized its because of the integer 9,6

What's an integer? That means whole numbers like 1, 2, 458, -2859. It does not mean fractional numbers like 0.5, .333, or 3.1415. If you must deal with fractional numbers, there is a separate program called bc which provides an arbitrary precision calculator language. It can be used in shell scripts, but is beyond the scope of this tutorial.


Okay now I have to use another method? in the if statement

Oh its because of the integer value 9,6 its not a integer

What's an integer? That means whole numbers like 1, 2, 458, -2859. It does not mean fractional numbers like 0.5, .333, or 3.1415. If you must deal with fractional numbers, there is a separate program called bc which provides an arbitrary precision calculator language. It can be used in shell scripts, but is beyond the scope of this tutorial.




Okay so now what hmmm just have to do a little reading i guess

If a string comparison is sufficient you can try:

Code:

if [ "$C" \> "$A" ]

Regards

Code:

#!/bin/ksh

a=1.72
b=1.71

if [ "$(echo "if (${a} > ${b}) 1" | bc)" -eq 1 ] ; then
   echo ">"
else
   echo "<"
fi;