TAR with maximum file size limit (100m)

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ageorge

626 posts

Ultimate Geek

#261821 16-Dec-2019 20:05

Hi Ive been trying to get my data off one drive and onto another using this command and variants;
sudo tar -cvpzf alsmain2018.tar.gz --exclude=alsmain2018.tar.gz --exclude-caches --one-file-system /media/alistair/USB450G/backintime/alsmain/ --exclude-from <(find /media/alistair/USB450G/backintime/alsmain/ -size +100M)
which results in:
tar: /dev/fd/63: No such file or directory
tar: Error is not recoverable: exiting now

Ive tried removing last directory backslash and if I run the command: sudo find /media/alistair/USB450G/backintime/alsmain/ -size +100M
find works as expected, finding files over 100m.

If I run command: sudo tar -cvpzf alsmain2018.tar.gz --exclude=alsmain2018.tar.gz --exclude-caches --one-file-system /media/alistair/USB450G/backintime/alsmain/
backup works no errors.

Can anyone figure why my find is wrong?
Thanks kindly, Al.

alexx

867 posts

Ultimate Geek

#2376618 16-Dec-2019 20:44

Most of the examples I’ve seen run find and pipe (or use -exec) the output to the tar command:
https://www.cyberciti.biz/faq/linux-unix-find-tar-files-into-tarball-command/

#include <standard.disclaimer>

jlittle

188 posts

Master Geek

ID Verified

Subscriber

#2376787 17-Dec-2019 09:47

It's the combination of sudo and the <( ) construct.

$ cat <(echo foo)

foo

$ sudo cat <(echo foo)

cat: /proc/self/fd/11: No such file or directory

You could run the find to a file in /tmp, then use that.

qwerty123

147 posts

Master Geek

#2376864 17-Dec-2019 11:32

In the command you use sudo elevates tar only. You cannot pipe data between processes running under different user IDs. You can try:

sudo sh -c 'sudo tar -cvpzf alsmain2018.tar.gz --exclude=alsmain2018.tar.gz --exclude-caches --one-file-system /media/alistair/USB450G/backintime/alsmain/ --exclude-from <(find /media/alistair/USB450G/backintime/alsmain/ -size +100M)'

ageorge

626 posts

Ultimate Geek

#2377026 17-Dec-2019 13:46

Thanks, that was it, sudo was doing the damage.