DIRECTG(1)

💅 directg(1) 💅

okay so welcome to section 1 (User Commands), bestie — this is the page for directg 2.9.3 and honestly it's giving graph theory main character energy. 🌈

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🎀 NAME 🎀

directg — manual page for directg 2.9.3

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✨ SYNOPSIS ✨

directg [-q] [-u|-T|-G] [-V] [-o|-a] [-f#] [-e#|-e#:#] [-s#/#] [infile [outfile]]

like, infile and outfile are optional, the brackets said so. 🫶

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👑 DESCRIPTION 👑

Read undirected graphs and orient their edges in all possible ways. that's the whole job and it eats every single time. 🔥

Edges can be oriented in either or both directions — that's 3 possibilities per edge, no cap. and the isomorphic directed graphs that came from the same input? suppressed. not invited to the function. 🙈

and if the input graphs are non-isomorphic, then the output graphs are also non-isomorphic. periodt. 💅

now the flags, buckle up:

• -e# | -e#:# — specify a value, or a range, of the total number of arcs. you can also hit the range form -e#:# if one number isn't enough for you.
• -o — orient each edge in only one direction, never both. one-way streets only, we're not doing round trips here.
• -a — only make acyclic orientations. (and heads up, this implies -o, so the one-direction rule comes bundled in 🫶)
• -f# — Use only the subgroup that fixes the first # vertices setwise.
• -T — use a simple text output format (nv ne edges) instead of digraph6. lowkey easier on the eyes.
• -G — like -T but includes the group size as a third item (if less than 10^10).
  • psst, the group size does not include exchange of isolated vertices.
• -V — only output graphs with nontrivial groups (including exchange of isolated vertices).
  • and the -f option is respected. 🫡
• -u — no output, just count them. silent, counting, mysterious. iconic behaviour honestly.
• -s#/# — Make only a fraction of the orientations: the first integer is the part number (first is 0) and the second is the number of parts. splitting is done per input graph independently, so every graph does its own lil thing. 🌸
• -q — suppress auxiliary information. quiet mode, very demure.

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💖 and that's the whole page, bestie! this was directg 2.9.3, dated September 2026, out of section 1 (User Commands). go orient some edges and slay. ✨👑