Ubuntu – Find number of files in folder and sub folders

With find:

find . -path '*/migrations/__init__.py' -exec truncate -s 0 {} + -o -path '*/migrations/*' -delete

This runs find in the current directory (.), and:

• for anything matching migrations/__init__.py, it will run the truncate command. truncate -s 0 <file> reduces the file to size 0 (empty);
• failing that match, for anything matching migrations/*, it will delete it;
• the * in -path matches / unlike the * in bash.

Example:

$ tree                                                                                                                                   
.
├── folder_1
│   └── migrations
│       ├── 0001_initial.py
│       ├── __init__.py
│       └── __pycache__
│           ├── 0001_initial.cpython-35.pyc
│           └── __init__.cpython-35.pyc
├── folder_2
│   └── migrations
│       ├── 0001_initial.py
│       ├── __init__.py
│       └── __pycache__
│           ├── 0001_initial.cpython-35.pyc
│           └── __init__.cpython-35.pyc
└── folder_3
    ├── admin.py
    ├── apps.py
    ├── __init__.py
    └── migrations
        ├── 0001_initial.py
        ├── __init__.py
        └── __pycache__
            ├── 0001_initial.cpython-35.pyc
            └── __init__.cpython-35.pyc

9 directories, 15 files
$ find . -path '*/migrations/__init__.py' -exec truncate -s 0 {} + -o -path '*/migrations/*' -delete                
$ tree                                                                                              
.
├── folder_1
│   └── migrations
│       └── __init__.py
├── folder_2
│   └── migrations
│       └── __init__.py
└── folder_3
    ├── admin.py
    ├── apps.py
    ├── __init__.py
    └── migrations
        └── __init__.py

6 directories, 6 files

$ wc -l */migrations/__init__.py
0 folder_1/migrations/__init__.py
0 folder_2/migrations/__init__.py
0 folder_3/migrations/__init__.py
0 total

You can do this using the printf action of find to print only the modification times in desired format, and then using sort and uniq:

find . -type f -printf '%TY-%Tm-%Td\n' | sort | uniq -c

• -printf '%TY-%Tm-%Td\n' prints the modification time of files in e.g. 2015-05-23 format

• sort sorts the output and uniq -c does the count by date

Example:

~/foobar% find . -type f -printf '%TY-%Tm-%Td\n' | sort | uniq -c
      3 2004-06-29
      1 2004-08-23
      1 2004-09-15
      1 2004-09-18
      1 2005-07-24
      1 2006-02-05
      2 2008-06-25
      3 2008-12-31
      1 2009-03-13
      1 2009-04-30
      1 2010-04-04
      2 2010-09-01
      8 2011-07-13
     15 2011-08-27
      3 2011-11-03
      3 2014-10-08