using if statement to check file size

Shell Programming and Scripting
1

Hi,

Am trying to execute certain commands if the condition satisfied, but i feel i am making some mistakes in the usage of if statement

here is the code

#!/bin/ksh
SIZE=$(ls -ltr /aemu/ws/DN.txt  | tr -s ' ' | cut -d ' ' -f 5)
filename=`TZ=CST+24 date +%Y%m%d`
ZERO=0

if [$SIZE=$ZERO ] 
then
cp /aemu/ws/DN.txt /aemu/ws/backup/dn/$filename
echo $SIZE
fi
exit

am getting the error as

Aemunathan

2

Hi,

If you want to check the file size is zero or non zero , use the below code

[ -s filename ] && echo "Size" || echo "Zero Size"
3

Hi

How can i use it in IF statement ?

4 
if [ -e $FILE ] && [ ! -s $FILE ]

(Reference)

5

In your original code the problem is that you need a space between the first square bracket and variable name. Also the = is to assign not compare. Try

if [ $SIZE -eq $ZERO ]
6

Hi

Thanks...got it working....