30

I want to count the total number of files in particular directory that ends with ".mp4" extension.

I am getting following command:

ls -F |grep -v / | wc -l

It count all the files in particular directory, but I want the count of files that end with .mp4 extension.

Is there any Ubuntu command for that?

  • 2
    The simple, correct, straightforward answer is @louis-matthijssen one. ls -1 handling of newline characters make, in this case, sensible to parse ls output. The marked one is wrong for the use of -R flag. – Rmano Apr 24 '14 at 16:25
17

Here you can do this way

ls -lR /path/to/dir/*.jpg | wc -l

This gives you count

  • 5
    Why the -R? Why doing a full stat when you just need the filename? Why not ls -1 *.jpg| wc -l? (ok, not working if you have filenames with newlines in it. In that case you deserve it ;-) ...) – Rmano Apr 24 '14 at 16:14
  • 2
    ...and the question was "counting the number of files in a directory". Moreover, this will list recursively all content of subdirectories which name end in .jpg, not files in subdirectories ending in .jpg. Have you ever tested it? – Rmano Apr 24 '14 at 16:28
  • 1
    The question says "files in a specific directory", which implies that subdirectory recursion is not wanted. – David Richerby Apr 24 '14 at 16:58
  • 1
    This also fails if there are too many files in the directory (because *.jpg is expanded by the shell, not by ls) and if there are files whose names begin with hyphens. – David Richerby Apr 24 '14 at 18:41
  • 2
    @DavidRicherby This skips names that start with .. But it actually works okay with hyphens in names, except when /path/to/dir is the empty string or a relative path beginning with a hyphen. But I was wrong before to have said ls replaces characters with ?. That happens when stdout is a terminal, but here the output is a pipe so ls sends all characters from filenames to wc. That makes this answer wrong without the -q or -b flag to change that behavior, because filenames can contain newlines. l0b0's answer is free of these problems. – Eliah Kagan Oct 10 '17 at 17:49
42

Unfortunately this benign problem is difficult to solve in a way which supports all file names and is portable. This is safe (it handles hidden files, paths containing spaces, dashes and even newlines) and POSIX compatible:

find /path/to/directory -mindepth 1 -type f -name "*.mp4" -printf x | wc -c

If you don't want it to be recursive, simply add -maxdepth 1.

You shouldn't parse ls output.

Test:

$ cd -- "$(mktemp -d)"
$ touch -- -foo.mp4 .bar.mp4 .bat.mp4 'baz.mp4
> ban.mp4'
$ find . -mindepth 1 -type f -name "*.mp4" -exec printf x \; | wc -c
4

Compare with the accepted answer:

$ ls -lR ./*.mp4 | wc -l
3

Or other suggestions:

$ find . -name "*.mp4" | wc -l
5
$ ls -1 *.mp4 | wc -l
ls: invalid option -- '.'
Try 'ls --help' for more information.
0
$ find . -name "*.mp4" | wc -c # Answer fixed at a later time
51
$ find . -name "*.mp4" | wc -l
5
$ find . | grep -i ".mp4$" | wc -l
5
$ ls . | grep ".mp4$" | wc -l
3
  • 2
    Although this answer is correct and robust, you can use -printf x instead of -exec printf x \;. That is: find /path/to/directory -mindepth 1 -type f -name "*.mp4" -printf x | wc -c There's no need to -exec the external printf command, which if there are many files will be very slow, because find has to fork(2) off a copy of itself and then execve(2) /usr/bin/printf. With -exec printf x \;, that must be done once for each file. – Eliah Kagan Oct 10 '17 at 17:39
  • -printf is not supported in POSIX find, which is why I didn't use it. – l0b0 Oct 11 '17 at 6:49
  • 1
    Neither are -mindepth and -maxdepth, which you used. – Eliah Kagan Oct 11 '17 at 10:34
  • Good point, I hadn't picked up on that! – l0b0 Oct 11 '17 at 18:27
  • BSD find contains -mindepth and -maxdepth but does not contain -printf so I do appreciate the inclusion of both. – Joseph Feb 9 '18 at 15:09
10

This one finds, sorts, and lists all files by extension in order:

find . -type f | sed 's/.*\.//' | sort | uniq -c
  • Excellent! I just would add a | sort -rn at the end and maybe a -mindepth 1 if just current dir. – Pablo Bianchi May 24 '17 at 23:41
  • And maybe pipe to head -n to get the top n. – Raman Jul 10 '17 at 0:55
5

I think it's very simple as following commands.

$ find . -name "*.mp4" | wc -l
8

or

$ find . | grep -i ".mp4$" | wc -l
8

I think that above commands calculate count of files and directories names *.mp4

so I suggest you use -type f option as find parameter as following.

$ find . -name "*.mp4" -type f | wc -l
8

In addition, ls -lR can be used as find .

2

You could use ls -1 *.mp4 | wc -l.

This will list all files ending on .mp4, printing each file on a new line (ls -1 *.mp4), pipe the output to wc which will count the number of new lines using the -l flag.

  • Not sure why this was downvoted, it works – Panther Apr 24 '14 at 16:13
  • Since *.mp4 is expanded by the shell, not ls, this will fail if there are so many .mp4 files in the directory that the list of them can't be passed to ls as arguments. – David Richerby Apr 24 '14 at 17:06
  • @Rmana Test it in a directory containing a file called --.mp4 – David Richerby Apr 24 '14 at 19:33
  • @DavidRicherby yes, you are right. -- will solve the second case; the former will rise an error message (you need a lot of files!) and another nice question here. Corner cases, but worth noticing, yes. – Rmano Apr 25 '14 at 12:59
  • 1
    @Rmano Without adding -q or -b, this does not tolerate newlines in filenames. If you run ls -1 *.mp4 from your terminal with no pipe, ls sees its stdout is a terminal and takes -q as implied, printing ?s. But that behavior goes away when the output is piped. ls -1 *.mp4 | wc -l overcounts if there are newlines. ls -1 *.mp4 | cat shows what wc "sees." (Similarly, -1 is implied when stdout isn't a terminal, so it's optional.) ls -1q -- *.mp4 | wc -l almost works, but not with zero .mp4 files. – Eliah Kagan Oct 11 '17 at 11:42
0

This should give you the list of file with .mp4

ls /path/to/directory | grep ".mp4$"

When combined with wc -l will give you count

ls /path/to/directory | grep ".mp4$" | wc -l

if you want search to include subdirectories

ls -lR /path/to/directory | grep ".mp4$" | wc -l
  • does not give a count – Panther Apr 24 '14 at 16:15
  • gave it to me when used with wc -l – Back.Slash Apr 24 '14 at 16:16
  • use ls without piping to grep and shorten your answer. It has been posted at least twice now. – Panther Apr 24 '14 at 16:19
  • @bodhi.zazen ls /directory/*.mp4 causes the shell to expand the glob and execute something like ls /directory/file1.mp4 /directory/file2.mp4 ... This will fail if the directory contains more mp4 files than can be passed as arguments to ls. – David Richerby Apr 24 '14 at 17:03
  • @DavidRicherby - it is not my ls command , I use find ;) – Panther Apr 24 '14 at 17:14
0

In bash, one cold resort to using arrays with glob:

$ files=( *.mp4  )
$ echo ${#files[@]}
30
0
ls | grep --count \.csv$

Replace (.csv with the extension you want)

Explanation: I think that a simple scheme is to fetch the list of files, and count the extension with grep. \. to match . and $ to match the extension at the end of line. It works because when the output of ls is piped, one file name is sent per line, which you can verify by running:

ls | cat
  • 1
    Note that instead of grep --count, you could also use grep -c. – Mohsin Raza Jun 22 '18 at 19:11
0

Check How To Count The Files By Extension In Linux?, it gives a good answer and explanation, you can use the following command:

find . -type f | sed -n 's/..*\.//p' | sort | uniq -c

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