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There are two possibilities for protection:
1) we should protect at least from very evil shell metacharacters,
like [$*], and also from [:cntrl:] (e.g. newline).
2) we can provide an exhaustive list of characters that are valid
for non-evil pathnames and commands, and issue mandatory warning
if the command or path appears to be evil.
I chose the latter approach.
Valid character range is 'A-Za-z0-9/@=.,:_+-'.
Note that (almost) all files from our base build system
are valid paths:
$ valid='A-Za-z0-9/@=.,:_+-'
$ hsh-run -- rpm -qal |grep "[^$valid]"
/usr/bin/[
/usr/share/man/man1/[.1.bz2
(contains no files)
(contains no files)
$
Later we'll see if the range of valid characters needs to be extended.
2b1c36538f