TL;DR: ncdu , du -h -d1 /.
On a system where you have root access, you should install the utility ncdu, which offers a friendly way of scanning and displaying the space occupied by the folders in the current directory ncdu (or in the folder sent as parameter when starting the utility: ncdu /).
If you don’t have root access, but you have the ncdu utility pre-installed, you won’t see the true size of the folders, so you should execute sudo ncdu /.
If you don’t have root access and you don’t have the ncdu utility at hand, you are stuck with the old du utility, which by default is pretty verbose (shows the size of each subfolder – if you’re in the root folder, it’s hard to get some meaningful info from the whole screens of data reported), so you should use some parameters to filter the output:
du -h -d1 /– use the ‘human’-style display (-h) to show the size in Kb, Mb, Gb, and the depth flag (-d, –max-depth) to help control the depth of directories that the command reports on.du -cBM – max-depth=1 /var/lib/ 2>&1 | grep -v 'denied' | sort -n– to skip displaying errors in case of denied acces to some folders and to sort by size, descending, the remaining first-level folders.
Enjoy!
TL;DR : cd ~/public_html/var/session/ && ls -1 | wc -l && perl -e 'for(<*>){((stat)[9]<(unlink))}' && ls -1 | wc -l with a close follower from rsync: rsync -a – delete /tmp/empty/ ~/public_html/var/session/ .
I had to delete ~1.700.000 files in a Magento ./var/session/ folder
- the Plesk interface crashed after a few minutes because it didn’t have the memory to list the folder’s content
- after ssh-ing into the machine, the classic rm -rf var/session/* also crashed afeter a few minutes with the error: ” -sh: /usr/bin/rm: Argument list too long”
Count the initial number of files:
cd ~/public_html/var/session/
ls | wc -l
So I started looking on other solutions on the wild web and I came to this Kinamo post: Efficiently delete a million files on Linux servers that had 4 variants:
- `-sh-4.2$ rm -rf var/session/*` -> -sh: /usr/bin/rm: Argument list too long
- `find /yourmagicmap/* -type f -mtime +3 -exec rm -f {} \;`
- `find /yourmagicmap/* -type f -mtime +3 -delete`
- `-sh-4.2$ rsync -a –delete /tmp/empty/ var/session/`
Details on those variants:
- rm: deleting millions of file is a no-can-do!
- find -exec: an option, but slower!
- find -delete: fast and easy way to remove loads of files.
- rsync –delete: without doubt the quickest!
Beside that post, I found another solution proposed on a Unix StackExchange thread: Faster way to delete large number of files [duplicate] which had answers on another one: Efficiently delete large directory containing thousands of files. The solution was a delete-in-5000-files-batches script:
#!/bin/bash
# Path to folder with many files
FOLDER="/path/to/folder/with/many/files"
# Temporary file to store file names
FILE_FILENAMES="/tmp/filenames"
if [ -z "$FOLDER" ]; then
echo "Prevented you from deleting everything! Correct your FOLDER variable!"
exit 1
fi
while true; do
FILES=$(ls -f1 $FOLDER | wc -l)
if [ "$FILES" -gt 10000 ]; then
printf "[%s] %s files found. going on with removing\n" "$(date)" "$FILES"
# Create new list of files
ls -f1 $FOLDER | head -n 5002 | tail -n 5000 > "$FILE_FILENAMES"
if [ -s $FILE_FILENAMES ]; then
while read FILE; do
rm "$FOLDER/$FILE"
sleep 0.005
done < "$FILE_FILENAMES"
fi
else
printf "[%s] script has finished, almost all files have been deleted" "$(date)"
break
fi
sleep 5
done
Stats for my test:
- batch-delete-script: 5000 files / 43 seconds -> ~100 files/s
- rsync: 50.000 files / 6 seconds -> 8300 files/s !!
Obviously, the rsync is the fastest solution for deleting a huge number of files!
PS. There was another solution on one of the stackexchange threads above, that claimed that a Perl one-liner would be even faster:
cd ~/public_html/var/session/ && ls -1 | wc -l && perl -e ‘for(<*>){((stat)[9]<(unlink))}' && ls -1 | wc -lI tested it and it was really faster…
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Cu ocazia sarbatorilor de Paste, va urez sa aveti parte de un Paste cat se poate de fericit impreuna cu cei dragi voua si sa va pastrati in suflet bunatatea si omenia prilejuite de aceasta sarbatoare cat se poate de mult (daca se poate, chiar pana in urmatorul an)!
Teo
Paste Fericit!
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