bash: Measure disk space of certain file types in aggregate

Question

I have some files across several folders:

/home/d/folder1/a.txt
/home/d/folder1/b.txt
/home/d/folder1/c.mov
/home/d/folder2/a.txt
/home/d/folder2/d.mov
/home/d/folder2/folder3/f.txt

How can I measure the grand total amount of disk space taken up by all the .txt files in /home/d/?

I know du will give me the total space of a given folder, and ls -l will give me the total space of individual files, but what if I want to add up all the txt files and just look at the space taken by all .txt files in one giant total for all .txt in /home/d/ including both folder1 and folder2 and their subfolders like folder3?

Answer 1

find folder1 folder2 -iname '*.txt' -print0 | du --files0-from - -c -s | tail -1

Answer 2

this will do it:

total=0
for file in $(ls *.txt)
do
space=$(ls -l $file | awk '{print $5}')
let total+=space
done
echo $total

Answer 3

Here's a way to do it, avoiding bad practice:

total=0
while read line
do
    size=($line)
    (( total+=size ))
done < <( find . -iname "*.txt" -exec du -b {} + )
echo $total

If you want to exclude the current directory, use -mindepth 2 with find.

Another version which may be more POSIX compliant:

find . -iname "*.txt" -exec du -b {} + | awk '{total += $1} END {print total}'

Answer 4

use the tool du and the parameter -I to exclude all other files.

Answer 5

GNU find,

find /home/d -type f -name "*.txt" -printf "%s\n" | awk '{s+=$0}END{print "total: "s" bytes"}'

Answer 6

Building on ennuikiller's, this will handle spaces in names. I needed to do this and get a little report:

find -type f -name "*.wav" | grep export | ./calc_space

#!/bin/bash
# calc_space
echo SPACE USED IN MEGABYTES
echo
total=0
while read FILE
do
    du -m "$FILE"
    space=$(du -m "$FILE"| awk '{print $1}')
    let total+=space
done
echo $total