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compare between files size

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# 1  
Old 07-22-2011
compare between files size
Hello

i have file A created yesterday and file B created today

thanks to help create script compare between 2 files according to size
so if file B is less than 10% of file A i should have echo message with warning
also check if file B exist or not.

this should be run in loop for list of files
i really dont know how to so such compare depending on percentage Smilie
# 2  
Old 07-22-2011
What is your system?

What is your shell?
# 3  
Old 07-22-2011
Quote:
Originally Posted by Corona688
What is your system?

What is your shell?
it will be run remotely using sshpass , the systems would be even redhat enterprise or sun solaris

the shell most of time is bash
# 4  
Old 07-22-2011
Use 'ls -l' to find out the size, then 'bc' to do the math, but stay away from floating point numbers (bash at least, can't compare floats in tests)

Code:
sizeA=`ls -l A | awk '{print $5}'`
sizeB=`ls -l B | awk '{print $5}'`

rat=`echo "$sizeB * 100 / $sizeA" | bc` #integer result

if [ $rat -lt 10 ] ; then
  #do whatever
fi

# 5  
Old 07-22-2011
Quote:
Originally Posted by mirni
Use 'ls -l' to find out the size, then 'bc' to do the math, but stay away from floating point numbers (bash at least, can't compare floats in tests)

Code:
sizeA=`ls -l A | awk '{print $5}'`
sizeB=`ls -l B | awk '{print $5}'`

rat=`echo "$sizeB * 100 / $sizeA" | bc` #integer result

if [ $rat -lt 10 ] ; then
  #do whatever
fi

thanks for your reply

what if i have list of files need to compare ?
as A and B
C and D
X and Y

also how to check existing of new file ?
# 6  
Old 07-22-2011
Quote:
what if i have list of files need to compare ?
make your list neat and tidy, with filenames grouped in pairs:
Code:
A.txt B.txt
C.txt D.txt

etc...

Then you can loop through the list easily:
Code:
while read A B ; do 
  sizeA=`ls -l $A | awk '{print $5}'`
  sizeB=`ls -l $B | awk '{print $5}'` 
  rat=`echo "$sizeB * 100 / $sizeA" | bc` #integer result
  if [ $rat -lt 10 ] ; then
    #do whatever
  fi
done < yourList.lst

That is assuming your filenames don;t contain whitespace characters. Otherwise, quote all variables.

Quote:
also how to check existing of new file ?
You could, for example, check the number of files present against the number of files in your list.
# 7  
Old 07-22-2011
Quote:
Originally Posted by mirni
make your list neat and tidy, with filenames grouped in pairs:
Code:
A.txt B.txt
C.txt D.txt

etc...

Then you can loop through the list easily:
Code:
while read A B ; do 
  sizeA=`ls -l $A | awk '{print $5}'`
  sizeB=`ls -l $B | awk '{print $5}'` 
  rat=`echo "$sizeB * 100 / $sizeA" | bc` #integer result
  if [ $rat -lt 10 ] ; then
    #do whatever
  fi
done < yourList.lst

That is assuming your filenames don;t contain whitespace characters. Otherwise, quote all variables.


You could, for example, check the number of files present against the number of files in your list.
thanks a lot for ur help

i think i dont need to check coz the value anyway will be less than 10%

thanks again for ur support
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