Susam

@susam

Mathematics, Lisp, Forth, Python, Unix, InfoSec, etc. • Author of and • Matrix room at

github.com/susam
Joined December 2006
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  1. Pinned Tweet
    May 4

    Here is some Star Wars-themed Forth programming: . Happy Star Wars Day! May the Forth be with you!

    6 retweets 22 likes
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  2. 21 minutes ago

    Please help with this issue! cc:

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  3. 40 minutes ago

    Please retweet this if you would like to help!

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  4. 46 minutes ago

    Reliance Jio Impersonation Issue: I think someone is impersonating me and acquiring mobile numbers. This makes me nervous! If you know who can help, please let me know. Please retweet this for a wider reach. Thanks for your help!

    2 replies 1 retweet 1 like
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  5. May 17

    Prasoon () and I will be speaking at 2021. Join us for our talk "Multi-Cloud Security Monitoring and CIS Benchmarks Evaluation at Scale" on 17-May-2021 21:45 UTC and a live deeper dive at 22:30 UTC: (1) (2)

    1 retweet 3 likes
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  6. May 14

    Analytic number theory meeting is about to begin now at 18:00 UTC. On the agenda: • Applications of Chinese remainder theorem. • Proving that the set of lattice points visible from the origin contains arbitrarily large gaps. Visit to get meeting link.

    1 retweet
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  7. May 14

    Enter :set cuc or :set cursorcolumn in Vim to highlight the column the cursor is on. Useful for checking alignment of text.

    1 retweet 7 likes
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  8. May 14

    One of my favourite features of typical mathematical text is how hyphenated words like "non-negative", "non-empty", etc. are written as single words. Examples: nonzero, nonempty, noninvertible, nonnormal, etc. What is your favourite feature of mathematical text?

    2 retweets 14 likes
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  9. May 13

    Dove into a little curiosity today: What is the most common filename extension of a Forth source code file? The most common is .fs obviously but it is twice as common for F# as it is for Forth. A popular one that is not used for other languages is .fth.

    8 likes
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  10. May 12

    Analytic number theory meeting will begin in 10 minutes at 18:00 UTC. On the agenda today: Lagrange's theorem and Wilson's theorem. Visit to get the meeting link and join us!

    1 like
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  11. Retweeted
    May 10

    Latency Exists, Cope! - This blog post from 2007 discusses these four strategies to design for latency: good decomposition, asynchronous interactions, non-monolithic data, and designing for active/active.

    4 retweets 4 likes
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  12. May 10

    Blast from the past! Came across this old manual from 1974 in the Freenode IRC channel: LOGO Manual:

    2 retweets 4 likes
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  13. May 9

    Do you recognize this programming language? This is how I learnt to program. I owe a lot to it. As a kid, reading and writing code like this, and using simple arithmetic, geometry, logic, and code to manipulate a 2D world had a lasting effect on me.

    2 replies 3 retweets 37 likes
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  14. Retweeted
    May 8

    From "I am burned out and I'll never accomplish anything" to "I'm going to play with physics" to "I got the Nobel Prize" -- A fascinating story from one of my favourite books, Surely You're Joking, Mr. Feynman!

    4 retweets 6 likes
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  15. May 8

    For more information on the command :w !sudo tee "%", enter the following commands in Vim: :help :w_c :help current-file :help :_% Also, enter the following command in shell: man tee I hope this was fun!

    3 retweets 10 likes
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  16. May 8

    How does :w !sudo tee "%" work? :w !{cmd} - Executes {cmd} with all lines in buffer as standard input. % - Expands to current filename. Quotes around it keep it as a single argument even if the filename contains whitespace. tee {file} - Copies stdin to stdout and {file}.

    1 reply 3 retweets 13 likes
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  17. May 8

    The famous Vim sudo-write trick: You open a file, edit it, and save it only to get the E45 error message. You now realize that only root can edit the file. What do you? Start over? No, instead try this: :w !sudo tee "%" Learnt it from back in 2005.

    4 replies 16 retweets 44 likes
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  18. May 7

    Prove in a single tweet: If gcd(a, b) = 1, then gcd(a + b, a - b) must be either 1 or 2.

    2 replies 2 retweets 7 likes
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  19. Retweeted
    May 7
    Replying to

    Type C-u to discard the current input line in Bash or Zsh, i.e., type ctrl + u to kill the current line. See "unix-line-discard" in "man bash" or "kill-whole-line" in "man zshzle" for details. By the way, Emacs-style key sequence C-a C-k works too.

    1 reply 3 retweets 3 likes
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  20. May 5

    Analytic number theory club meeting today at 18:00 UTC. We'll begin modular arithmetic today. This topic is quite accessible even for those who haven't joined our prior sessions. So if you want to join the club, today is a good day! Visit for meeting link.

    4 retweets 8 likes
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