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let: add page (#14616)

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* let: add page

* Update pages/linux/let.md

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

* Update pages/linux/let.md

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

* Update pages/linux/let.md

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

* Update pages/linux/let.md

* add --help example

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

---------

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Nelson Figueroa <30811275+nelsonfigueroa@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>
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Shou-Chi Chen 2024-11-22 09:07:27 +08:00 • committed by GitHub
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# let
> Evaluate arithmetic expressions in shell.
> Supports variables, operators, and conditional expressions.
> More information: <https://manned.org/let>.
- Evaluate a simple arithmetic expression:
`let "{{result = a + b}}"`
- Use post-increment and assignment in an expression:
`let "{{x++}}"`
- Use conditional operator in an expression:
`let "{{result = (x > 10) ? x : 0}}"`
- Display help:
`let --help`