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sub bashquote { "'" . shift =~ s/'/'"'"'/gr . "'" }

# untested
sub bashquote
...
    s/'/'"'"'/g;
    return "'$_'";
}

# untested
sub bashquote
...
    s/'/'"'"'/g;
    return "'$_'";
}

# untested
sub bashquote
...
    s/'/'\''/g;
    return "'$_'";
}

# untested
sub bashquote
...
    s/''$//;
    return $_;
}

# untested
sub bashquote
...
    s/''$//;
    return $_;
}

# untested
sub bashquote
...
    s/''$//;
    return $_;
}

# untested
sub shell_quote
{
    return join(' ',map { bashquote($_) } @_);
}