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I have 357 .png files located in different sub dirs of the current dir:

settings# find . -name \*.png |wc -l

settings# find . -name \*.png | head

Is there a oneliner to calculate the total disk space occupied by them (before I pngcrush them)?

I've tried (unsuccessfully):

settings# find . -name \*.png | xargs du -s
4       ./assets/support/wifi_locked_icon_white.png
1       ./assets/support/wifi_vpn_icon_connected.png
1       ./assets/support/wi_fi.png
1       ./assets/support/wi_fi_conected.png
8       ./bin/blackberry-tablet-icon.png
2       ./bin/icons/ca_about.png
2       ./bin/icons/ca_accessibility.png
2       ./bin/icons/ca_accounts.png
2       ./bin/icons/ca_airplane_mode.png
2       ./bin/icons/ca_application_permissions.png
1       ./bin/icons/ca_balance.png
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up vote 2 down vote accepted

Maybe something like:

find . -type f -name "*.png" -printf '%s\n' | awk '{ sum += $1 } END { print sum }'

? Seems to work for me - results would be in bytes.

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This is quite expensive, since du (an external command) is executed once for every file. – adaptr Jul 10 '12 at 13:53
No need to pipe to cut -f1. – quanta Jul 10 '12 at 13:56
@quanta: Doh, you're right :) – thinice Jul 10 '12 at 14:29
@adaptr A new approach vs. du - as I agree, but he said he didn't have many files so I figured efficiency wouldn't matter. – thinice Jul 10 '12 at 14:39

du is my favorite answer. If you have a fixed filesystem structure, you can use:

du -hc *.png

If you need to add subdirs, just add:

du -hc *.png **/*.png **/**/*.png

etc etc

However, this isn't a very useful command, so using your find:

TOTAL=0;for I in $(find . -name \*.png); do  TOTAL=$((TOTAL+$(du $I | awk '{print $1}'))); done; echo $TOTAL

That will echo the total size in bytes of all of the files you find.

Hope that helps.

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To find the size in Kbytes (as long as column 5 of ls -l is 'size'

find . -name \*.png -exec ls -lk {} \; | awk '{ sum +=$5} END {print sum}'
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DO NOT try to parse the output of ls! It represents filesystem content, it is not actual filesystem content. – adaptr Jul 10 '12 at 13:51
Yet we dont need to measure the filesystem content, we need to just sum the representation. – Sirch Jul 10 '12 at 13:59
That's where the difference lies between the output from ls and du. – adaptr Jul 10 '12 at 14:54

find . -name *.png -print0 | du -c --files0-from=- | tail -1

In logical block sizes; insert -b in the du command to output bytes.

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Lack of the quotes around the file name. – quanta Jul 10 '12 at 13:55
Irrelevant when using NUL-terminated filenames. – adaptr Jul 10 '12 at 13:56
Don't you get find: paths must precede expression...? – quanta Jul 10 '12 at 14:08
Only if you typo'ed my solution. – adaptr Jul 10 '12 at 14:53
Do you want to see a screenshot? – quanta Jul 10 '12 at 15:02

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