2. More examples with `find`

Let's create some test files:

mkdir -p test/dir-{001..100}

touch test/dir-{001..100}/file-{A..Z}

The command touch in this case creates empty files.

ls test/

ls test/dir-001/

ls test/dir-002/

Find all the files named file-A:

find test -type f -name 'file-A'

find test -type f -name 'file-A' | wc -l

Create a timestamp file:
```
touch test/timestamp
```
This creates an empty file and sets its modification time to the current time. We can verify this with stat which shows everything that the system knows about a file:
```
stat test/timestamp
```
```
touch test/timestamp
```
```
stat test/timestamp
```
We can see that after the second touch the times have been updated.

Next, let's use find to update all files named file-B:

find test -name 'file-B' -exec touch '{}' ';'

Now let's use find to identify the updated files by comparing them to the reference file timestamp:
```
find test -type f -newer test/timestamp
```
```
find test -type f -newer test/timestamp | wc -l
```
The result contains all 100 instances of file-B. Since we did a touch on them after updating timestamp, they are now "newer" than the file timestamp.

Let's find again the files and directories with bad permissions:

find test \( -type f -not -perm 0600 \)     \
      -or \( -type d -not -perm 0700 \)

find test \( -type f -not -perm 0600 \)     \
      -or \( -type d -not -perm 0700 \)     \
  | wc -l

Let's add some actions to the command above in order to fix the permissions:

find test    \
    \(       \
        -type f -not -perm 0600     \
        -exec chmod 0600 '{}' ';'   \
    \) -or   \
    \(       \
        -type d -not -perm 0700     \
        -exec chmod 0700 '{}' ';'   \
    \)

find test \( -type f -not -perm 0600 \)     \
      -or \( -type d -not -perm 0700 \)

find test \( -type f -perm 0600 \)    \
      -or \( -type d -perm 0700 \)

find test \( -type f -perm 0600 \)    \
      -or \( -type d -perm 0700 \)    \
  | wc -l

Note: This example is a bit complex just to illustrate the logical operators and parantheses, however we could have done it in two simpler steps, like this:

find test -type f -not -perm 0600  \
          -exec chmod 0600 '{}' ';'

find test -type d -not -perm 0700  \
          -exec chmod 0700 '{}' ';'

Let's try some more tests:

Find files or directories whose contents or attributes were modified more than 1 minute ago:
```
find test/ -cmin +1 | wc -l
```
Less than 10 minutes ago:
```
find test/ -cmin -10 | wc -l
```
Find files or directories whose contents were modified more than 1 minute ago:
```
find test/ -mmin +1 | wc -l
```
Less than 10 minutes ago:
```
find test/ -mmin -10 | wc -l
```
Find files or directories whose contents or attributes were modified more than 7 days ago:
```
find test/ -ctime +7 | wc -l
```
Find files or directories whose contents were modified less than 7 days ago:
```
find test/ -mtime -7 | wc -l
```
Find empty files and directories:
```
find test/ -empty | wc -l
```

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