I did a website scrape for a conversion project. I'd like to do some statistics on the types of files in there -- for instance, 400 .html files, 100 .gif, etc. What's an easy way to do this? It has to be recursive.

Edit: With the script that maxschelpzig posted, I'm having some problems due to the architecture of the site I've scraped. Some of the files are of the name *.php?blah=blah&foo=bar with various arguments, so it counts them all as unique. So the solution needs to consider *.php* to be all of the same type, so to speak.


You could use find and uniq for this, e.g.:

$ find . -type f | sed 's/.*\.//' | sort | uniq -c
   16 avi
   29 jpg
  136 mp3
    3 mp4

Command explanation

  • find recursively prints all filenames
  • sed deletes from every filename the prefix until the file extension
  • uniq assumes sorted input
    • -c does the counting (like a histogram).
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  • I have a similar script. Simple and fast. – Rufo El Magufo Aug 10 '11 at 19:10
  • Some of the files are of the name *.php?blah=blah&foo=bar with various arguments, so it counts them all as unique. How can I modify it to look for *.php*? – user394 Aug 11 '11 at 13:35
  • 3
    You can try to use a different sed expression, e.g. sed 's/^.*\(\.[a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9]\).*$/\1/' – maxschlepzig Aug 11 '11 at 14:35
  • Thank you for taking the time to explain what each portion does. So many answers on similar topics skip this part. /learning-to-fish – MechEthan Jan 26 '13 at 1:39
  • 1
    @bela83, the prune variants rely on short-circuit evaluation - thus, my first version find -name '.*' -prune -o -type f -print evaluates like: if directory entry matches .* then prune it, otherwise if it is a file then print it. Since .* also matches ., i.e. the CWD, everything is pruned, i.e. find does not even descend into the first directory. Perhaps, 2 year old versions of find behaved differently - or it was just an oversight of me, back then. Anyhow, find -name '.*' -not -name . -prune -o -type f -print fixes this. – maxschlepzig May 4 '15 at 20:16

With zsh:

print -rl -- **/?*.*(D.:e) | uniq -c |sort -n

The pattern **/?*.* matches all files that have an extension, in the current directory and its subdirectories recursively. The glob qualifier D let zsh traverse even hidden directories and consider hidden files, . selects only regular files. The history modifier retains only the file extension. print -rl prints one match per line. uniq -c counts consecutive identical items (the glob result is already sorted). The final call to sort sorts the extensions by use count.

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This one-liner seems to be a fairly robust method:

find . -type f -printf '%f\n' | sed -r -n 's/.+(\..*)$/\1/p' | sort | uniq -c

The find . -type f -printf '%f\n' prints the basename of every regular file in the tree, with no directories. That eliminates having to worry about directories which may have .'s in them in your sed regex.

The sed -r -n 's/.+(\..*)$/\1/p' replaces the incoming filename with only its extension. E.g., .somefile.ext becomes .ext. Note the initial .+ in the regex; this results in any match needing at least one character before the extension's .. This prevents filenames like .gitignore from being treated as having no name at all and the extension '.gitignore', which is probably what you want. If not, replace the .+ with a .*.

The rest of the line is from the accepted answer.

Edit: If you want a nicely-sorted histogram in Pareto chart format, just add another sort to the end:

find . -type f -printf '%f\n' | sed -r -n 's/.+(\..*)$/\1/p' | sort | uniq -c | sort -bn

Sample output from a built Linux source tree:

    1 .1992-1997
    1 .1994-2004
    1 .1995-2002
    1 .1996-2002
    1 .ac
    1 .act2000
    1 .AddingFirmware
    1 .AdvancedTopics
 1445 .S
 2826 .o
 2919 .cmd
 3531 .txt
19290 .h
23480 .c
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I've put a bash script into my ~/bin folder called exhist with this content:


for d in */ ; do
        echo $d
        find $d -type f | sed -r 's/.*\/([^\/]+)/\1/' | sed 's/^[^\.]*$//' | sed -r 's/.*(\.[^\.]+)$/\1/' | sort | uniq -c | sort -nr
#       files only      | keep filename only          | no ext -> '' ext   | keep part after . (i.e. ext) | count          | sort by count desc

Whichever directory I'm in, I just type 'exh', tab auto-completes it, and I see something like this:

$ exhist
      7 .java
      1 .txt
     42 .html
     10 .class
      4 .jar
      3 .lst
      1 .xml
      1 .txt
      1 .properties
      1 .js
      1 .css

P.S. Trimming the part after the question mark should be simple to do with another sed command probably after the last one (I haven't tried it): sed 's/\?.*//'

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I know this thread is old but, this is one of top results when searching for "bash count file extensions".

I encountered the same problem as you and created a script similar to maxschlepzig

Here is the command i made that counts the extensions of all files in the working directory recursively. This takes into account UPPER, and LOWER cases, merging them, removing false positive results, and counting the occurrences.

find . -type f \
  | tr '[:upper:]' '[:lower:]' \
  | grep -E ".*\.[a-zA-Z0-9]*$" \
  | sed -e 's/.*\(\.[a-zA-Z0-9]*\)$/\1/' \
  | sort |
  | uniq -c \
  | sort -n

Here is the github link if you'd like to see more documentation.


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