$ strings /bin/bash | grep -c prefer-visible-bell 1 $ man bash | grep -c prefer-visible-bell 0 $ find /usr/share/doc/bash* -type f | xargs zgrep prefer-visible-bell | wc -l 0
- undocumented 'prefer-visible-bell' found in /bin/ba... 積丹尼 Dan Jacobson
$ strings /bin/bash | grep -c prefer-visible-bell 1 $ man bash | grep -c prefer-visible-bell 0 $ find /usr/share/doc/bash* -type f | xargs zgrep prefer-visible-bell | wc -l 0