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-My tentative introductory guide to navigating a shell interface
-(assuming Bash).
-
-🚧 These are rough notes meant for guiding in-person discussions; they
-are somewhat terse. 🚧
-
-* Moving around, invoking stuff
-
-With a file browser and a terminal emulator side-by-side:
-
-- ls, cd, mkdir, touch, rm; "/" = root
-- globs
-- arguments vs options (e.g. ls, diff)
-- man, --help
-- standard input/output/error: pipes, redirection
-- writing scripts (shebangs: see bash(1) § COMMAND EXECUTION)
-
-* Shell language
-
-- ; & (e.g. sleep)
-- && || (e.g. grep)
-- if, for
-- $? (e.g. grep, diff)
-- [
-- variables
-- functions, $@, $1…
-- black-box model of a command:
-    - inputs: stdin, arguments, environment
-    - outputs: stdout, stderr, exit code
-    - side-effects: I/O, e.g. files, network
-- which, type: keyword ≠ builtin ≠ function ≠ program
-- valar quotulis (valar escaepis); e.g. sort operator: [ foo '>' bar ]
-
-* Advanced
-
-- ( ) ≠ { }: try to set variables, or call exit
-- (( )), $( )
-- glob ≠ regex
-- bash extensions
-    - [[
-    - <( )
-    - |&, >&
-    - arrays
-- job control: fg, bg, jobs, wait, kill, C-z