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22 lines
540 B
Plaintext
22 lines
540 B
Plaintext
---
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syntax: markdown
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tags: [tldr, common]
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source: https://github.com/tldr-pages/tldr.git
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---
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# while
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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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- Read `stdin` and perform an action on every line:
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`while read line; do echo "$line"; done`
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- Execute a command forever once every second:
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`while :; do {{command}}; sleep 1; done`
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- Execute a command until it fails:
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`while {{command}}; do :; done`
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