Contents
Is it possible to get the compressed and uncompressed files?
The on-disk size is equal to the size of the file plus the size of its metadata, rounded to the file system block size. Non compressed files will usually have a slightly larger on disk size than their actual (bytes count) size. As already stated, the uncompressed size is shown by ls -l.
How does copying / dev / null affect file size?
Suppose that process P opens a file for writing without appending, yielding file descriptor fd. Then the effect on the file size (as stat () reports it) of truncating a file (e.g. by copying /dev/null to it) will be undone as soon as P writes to fd.
How to send null output to a file?
To send a null output to the file, use the flag -n which tells echo to not output the trailing newline that leads to the empty line produced in the previous command. 5. Empty File Using truncate Command
How is the size of a compressed file determined?
Retrieves the actual number of bytes of disk storage used to store a specified file. If the file is located on a volume that supports compression and the file is compressed, the value obtained is the compressed size of the specified file.
Is it possible to get the compressed and total size?
Run btrfs filesystem df /mountpoint. The key line starts with Data:; used= is the compressed size, and total= is the total size as if on an uncompressed filesystem.
How to find files and directories over a certain size?
I am currently using du -sch /var/log/ | grep total | grep G to find /var/log/ directories consuming over 1 GB space. It works perfectly. I’m now looking to adjust this to do the same thing, but only show a result if the directory is over 5 GB.
How to check compression ratio on whole partition?
To check compression ratio on whole partition use these two commands: Then divide the outputs. I guess that my 25% compression ratio is a typical result to expect from a zlib compressor. You can create a Btrfs filesystem in a file, mount it, copy the files there and run df: