Keep your home brew up to date

# Here's an example of how to run a command to periodically keep homebrew up to date on your Mac:

1. Create a bash scrpit as below.


```
#!/bin/bash
brew update && brew upgrade && brew cleanup
```
2. Add a Permission

```
$ chmod +x ${shell script file as above}
```

3. Setup launchd

put plist at `~/Library/LaunchAgents/${Please replace this with your plist path}.plist`

```
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>${Please replace this with your script file name}</string>
    <key>ProgramArguments</key>
    <array>
        <string>${Please replace this with your script path}</string>
    </array>
    <key>StartCalendarInterval</key>
    <dict>
        <key>Hour</key>
        <integer>12</integer>
        <key>Minute</key>
        <integer>0</integer>
    </dict>
    <key>RunAtLoad</key>
    <false/>
</dict>
</plist>
```