size calc

[shruti_1]

I have hundred of compressed files in one directoy. If i need to calculate the size of files ending with .Z how can i do so.

[Ninad_1]

You can do

ls -l *.Z | awk '{tot+=$5} END {print "Total size =",tot/1024,"KB"}'

Regards,
Ninad

[Steven E. Protter]

Shalom shruti,

The bearer of bad news, me will tell there is no way to accurately predict how the files will compress. That depends on how compressible the data is in the files.

Any attempt to predict accurately the size of the resultant file will fail.

SEP

[Kenan Erdey]

without awk:

top=0
for f in *.Z
do
size=`(ls -l $f | tr -s ' ' | cut -f5 -d' ')`
top=`expr $top + $size`
done
echo "total bytes of compressed files=" $top

[Peter Nikitka]

Hi,

I think you want to know wether the filesystem is able to hold all the files after uncompressing:
You won't be able to do this without really uncompressing each of them.

You can do an uncompress of one file and permanently check, if your freespace is big enough to hold the next.
I suggest something like that in ksh:


[ -d dir4flatfiles ] || mkdir dir4flatfiles
typeset -i free sz hog=100000

# you can set the factor statically or compute one dynamically as max(uncompr_size/compr_size)
for z in *.Z
do
sz=$(ls -s $z | awk -v factor=1.5 '{print $1*2*factor}')
free=$(bdf dir4flatfiles | awk 'NR>1 && NF>3 {print $(NF-2)}')
if [ free -gt sz+hog ]
then uncompress <$z >dir4flatfiles/${z%.Z}
else
print -u2 insufficient space for uncompress: $free
break
fi
done

mfG Peter

[spex]

You can zcat the *.Z files, and then count bytes:

#!/usr/bin/sh
# ./zcatsz.sh
for f in *.Z
do
echo $f $(zcat $f | wc -c) bytes
done

If you want the total size, pipe the script through awk:

./zcatsz.sh | awk '{t+=$2} END {print t "bytes"}'

PCS