Can ncal show holidays?

The ncal command itself does not have built-in functionality to display holidays. However, you can use the -H option to highlight specific holidays if you have a file that contains holiday dates in a format that ncal can recognize.

For example, you can create a file with holiday dates and then use the -H option to display them. Here's how you can do it:

Create a file named holidays.txt with the following format (one holiday per line):
```
1 1 New Year's Day
7 4 Independence Day
12 25 Christmas Day
```
Use the ncal command with the -H option:
```
ncal -H holidays.txt
```

This will display the calendar with the specified holidays highlighted. Note that you may need to adjust the format of the holiday file based on your specific requirements.