The current directory has files *-bytes.log that each contain a single column with a number of bytes on each row, example:
53824 247104 61776 53824 53824 53824 247104 53824 247104 542
The code contains an outer loop to iterate the files and an inner loop to process the contents of the files
for file in $(ls *-bytes.log); do
sum=0;
for num in $(cat $file); do
let sum=$sum+$num;
done
echo "$sum/1024/1024/1024" | bc -l | xargs printf "$file %1.2f GB\n";
done
This is an alternative approach using an inner while loop to read the sums rather than cat'ing the file
for file in $(ls *-bytes.log); do
sum=0;
while read num; do
let sum=$sum+$num;
done < $file
echo "$sum/1024/1024/1024" | bc -l | xargs printf "$file %1.2f GB\n";
done
Sample results
user1-bytes.log 3.81 GB user2-bytes.log 4.75 GB user3-bytes.log 1.40 GB user4-bytes.log 2.03 GB user5-bytes.log 5.01 GB ...
I've also found the following bit of code helpful in my $HOME/.bashrc to make quick calculations easy (this comes from a nixCraft Facebook post:
# nixCraft (on Facebook) calc recipe
# Usage: calc "10+2"
# Pi: calc "scale=10; 4*a(1)"
# Temperature: calc "30 * 1.8 + 32"
# calc "(86 - 32)/1.8"
calc() { echo "$*" | bc -l; }
