How does one find out how many bits a file has in one command?

Question

I was able to export the blog from a wordpress.com site to a self-hosted one.

However, I am having issues installing the 'CORE widgets' (http://en.support.wordpress.com/topic/widgets-sidebars/). Are these locked down to wordpress.com only?

Thanks!

Solution 1

With GNU du:

du -b FILE | awk '{ print $1 * 8 }'

Solution 2

A shell + GNU coreutils solution:

echo $(( 8 * $(stat -c%s FILE) ))

The -c%s option to stat returns just the file size in bytes, eliminating any need for additional text processing. This syntax is supported by GNU coreutils and therefore should work under most linux distributions.

As an exception on linux, if one is running zsh with the optional zsh/stat module, then one needs to specify a path to get the GNU coreutils:

echo $(( 8 * $(command stat -c%s FILE) ))

Solution 3

It is possible in one line, because you can put several commands on one line, e.g. connected by pipes or command substitutions:

echo $(stat -c %s FILE) '* 8' | bc

(Thanks @frostschutz for the update).

Solution 4

With GNU find (predates GNU stat by decades):

find file -prune -printf '%s*8\n' | bc

Relatively portably:

ls -ld -- "$file" | awk '{print $5*8;exit}'

Solution 5

Single file:

wc -c yourfile | awk '{print $1*8}'

Mutiple files:

wc -c yourfile1 yourfile2 | awk '{$1*=8; print $0}'

This one also works for a single file. It is not completely bulletproof though, see Stephane's comment.

These are POSIX standard compliant commands.

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Comments

[Jure C.]

which one specific are you looking for? Most of them are open.

[Sekhar]

I am looking at Twitter, Box.net, Authors, Flickr, SocialVibe Gravatar among few. I want to restore as much functionality as possible and want to use the same plugins - (using similar plugins would be my next preference - ).. Thanks

[Babak Naffas]

Are you sure these widgets weren't installed as part of your theme?

[Sekhar]

ya.. I am using the twenty10 theme.. these widgets were not there..

[Martin von Wittich]

I don't think so. I also don't see any practical use for a feature like that ^^

[TheBeginner]

@MartinvonWittich - internet speeds are often done in 'bits per second'...

[Ignacio Vazquez-Abrams]

@wilf: Minus protocol overhead.

[Felipe]

In my case I am using this suit test: csrc.nist.gov/groups/ST/toolkit/rng/documentation_software.h‌​tml and the parameter is the number of bits I want to analyse.

[John1024]

@StephaneChazelas Thanks for the info. Answer updated.

[Felipe]

It seems a good explanation, thank you. However in my test this command returned to me: title:7: bad math expression: operand expected at `%s ' ]2;echo 4096000 ---- the answer is 4096000, but what are the other errors?

[Felipe]

Worked like a charm to me. ➜ tmp stat random-file-3 | sed -n 's/Size: ([0-9]*).*/\1 * 8/p' | bc ➜ 4096000

[Felipe]

Great. Awesome. ➜ tmp wc -c random-file-1 random-file-2 random-file-3 | awk '{$1*=8; print $0}' ➜ 32832 random-file-1 ➜ 49152 random-file-2 ➜ 4096000 random-file-3 ➜ 4177984 total

[John1024]

@FelipeMicaroniLalli I cannot reproduce that error and I do not see any circumstance that would both (a) give that error message, and, at the same time, (b) give the right numerical answer. Curious.

[aragaer]

Except it doesn't need bc - awk can do math itself: du -b FILE | awk '{print $1 * 8}

[Stéphane Chazelas]

See also wc -c < FILE for a portable equivalent (for non-regular files, it has the side-effect of reading them, though)

[Stéphane Chazelas]

Note that it has side effects if the files are not regular files. The second one would display a a    b file as a b (sequences of blanks converted to a single space, trailing blanks removed).

[Stéphane Chazelas]

Won't work in non-English locales or on non-GNU systems or for a file called ZSize: 5 for instance

[frostschutz]

how about stat -c %s FILE to print size directly, instead of the sed?

[Totor]

@StephaneChazelas with what kind of non-regular file did you try please?

[Stéphane Chazelas]

Any type (fifos, sockets, doors, devices, directories...). You'll have issues with filenames containing newline characters as well. You may want to add a NR == 1