Unix users have traditionally had the simple "cal" program to show this month's
calendar, and can reasonably easily produce a one-liner to let them keep track
of upcoming events in a text file (mine's grep "^`date +'%Y%m%d'`"
~/todolist). These days, there are standard formats for specifying
calendar information from people like the IETF calsch working group and
the RDF Calendar taskforce; it would be nice if there were command-line
tools to easily manipulate these.
Tools could include:
- converting calendar data to and from easily-manipulable formats (space-separated fields)
- merging and splitting calendar files
- displaying a calendar with events marked on it
- generating new events
It would similarly be nice to have command-line tools for managing other PIM data: contacts (in vCard or FOAF format), to-do lists, and so on. A really fancy solution could tie in with an mh-like suite of email tools (although preferably one that spoke IMAP and Maildir) for easy "intertwingling" from shell scripts.