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Today I Learned

A random collection of things I've learned and forgotten and relearned and reforgotten and so on...

Bash

  • 2>&1 - Pipe STDERR to STDOUT so it can be captured with >.
  • man re_format 7 - The full man page documentation for POSIX Regular Expressions

Disk Usage Quick and Easy

  • du -hs ./* - Don't use man du and then use -d 1 to trim depth, that ONLY gives you disk usage one layer deep. -s will SUM up the disk space used, and passing ./* means sum up the space for EACH folder involved. The -h is just there to provide human-friendly output (e.g. 700M or 4.1G)

Emacs

  • M-x package-refresh-contents - This is apt-get update for MELPA. Use this when package-install tells you a package is present but running it fails with an error about the packgage+timestamp.tgz could not be found.

RubyGems

  • Do I want colorize or term-ansicolor?
    • http://flori.github.io/term-ansicolor/
    • If you're only going to learn one, learn term-ansicolor and manually add the class String; include Term::ANSIColor; end monkeypatch to make it behave like colorize.
    • If you want more power, term-ansicolor has FAR more colorizing power. Run term_colortab, term_mandel, or term_display <imagefile> in bash for cool demos.
    • If you already know colorize and it does everything you want and you don't want the hassle, just stick with that. Colorize can add strings cleanly and I haven't figure out how to do that in term-ansicolor yet.

But term-ansicolor is FAR more powerful. It has a bajillion colors and includes a bunch of cool demos like term_mandel or term_display <imagefile> (brew/apt install netpbm to support image formats other than pbm). If you're only going to learn one, learn term-ansicolor and get used to this shorthand:

TL;DR: If someone who loves colorize asks why you use term_ansicolor, show them the difference here:

$ ruby -rcolorize -e 'puts String.color_samples'
$ term_colortab

Or, if they're from CMM, show them this. It's subtle and you have to work hard for it but if you value this sort of thing like I do you'll get it:

$ ruby -rcolorize -e 'puts "cover".bold.yellow.on_white +
"my".bold.magenta.on_white + "meds".bold.yellow.on_white'

$ ruby -rterm/ansicolor -e 'c=Object.new.extend Term::ANSIColor; print c.bold,
c.on_white, Term::ANSIColor::RGBTriple[ [247, 141, 37] ].color("cover"), c.bold,
c.on_white, Term::ANSIColor::RGBTriple[ [ 160, 0, 64 ] ].color("my"), c.bold,
c.on_white, Term::ANSIColor::RGBTriple[ [247, 141, 37] ].color("meds"), "\n"'

(See covermymeds-term-ansicolor.txt and covermymeds-colorize.txt in this repo for example output)

Random

Other

Things that don't fit in any other category--not even Random