The format of a symbolic mode is [ugoa...][[+-=][perms...]...], where perms is either zero or more
letters from the set rwxXst, or a single letter from the set ugo. Multiple symbolic modes can be given,
separated by commas.
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Change the mode of each FILE to MODE.
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-c, --changes
like verbose but report only when a change is made
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--no-preserve-root
do not treat `/' specially (the default)
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--preserve-root
fail to operate recursively on `/'
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-f, --silent, --quiet
suppress most error messages
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-v, --verbose
output a diagnostic for every file processed
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--reference=RFILE
use RFILE's mode instead of MODE values
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-R, --recursive
change files and directories recursively
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--help display this help and exit
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--version
output version information and exit
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