while: clarify descriptions (#15232)
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
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# while
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# while
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> Simple shell loop.
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> Simple shell loop that repeats while the return value remains zero.
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> More information: <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_04_09>.
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> More information: <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_04_09>.
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- Read `stdin` and perform an action on every line:
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- Read `stdin` and perform an action on every line:
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`while :; do {{command}}; sleep 1; done`
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`while :; do {{command}}; sleep 1; done`
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- Execute a command until it returns a non-zero value:
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- Execute a command until it fails:
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`while {{command}}; do :; done`
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`while {{command}}; do :; done`
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