tldr/pages/common/while.md

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# while
> Simple shell loop.
> More information: <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_04_09>.
- Read `stdin` and perform an action on every line:
`while read line; do echo "$line"; done`
- Execute a command forever once every second:
`while :; do {{command}}; sleep 1; done`