CLI

Command-Line Interface, i.e., a console/Terminal tool.

I've been using some of this stuff for over a decade now (or their predecessors), and they tend to stick around.

• speedometer, a neat Python curses-based monitor.
• nc - the Swiss Army Knife of any WAP tester worth his salt.
• tcpflow - plaintext dumps of HTTP traffic without the hassle of parsing tcpdump output.
• vim - the editor. Accept no substitutes.
• SSH - you do want to use all of these securely, now don't you?
• wget - Oh, how can I request thee - let me count the ways...
• unison, which has mostly replaced my old set of sync tools:
  • rsync - for tunneled syncing of files over SSH
  • ssync - for direct syncing of mounted filesystems
• screen - virtual desktops, VT100 style
• procmail - keep your mail tidy
• oleo, a text-based spreadsheet.
• links, a text-based browser.
• remind, a text-based calendar and alarm program (via 43 Folders)
  • Wyrd, a curses front-end for it.