Re: how to escape round parentheses in a system call

It's not clear how the command fails. I replaced "command" with "echo" and added a simple string to the hash referenced by $_. The qq behaves as double quotes, i.e. a single backslash is interpreted by it, so \( becomes (, but ( is special in the shell. You need to escape it, so use double backslash:

$_->{Sub_URL} = 'suburl';
print qq{echo $_->{Sub_URL} \(?i\)Podcast ARGS\n};
system qq{echo $_->{Sub_URL} \\(?i\\)Podcast ARGS};
#                            ~~   ~~
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map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

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Re^2: how to escape round parentheses in a system call by ObiPanda (Acolyte) on Jun 11, 2023 at 21:35 UTC
thanks. It works exactly as needed.	[reply]
Re^3: how to escape round parentheses in a system call by haukex (Archbishop) on Jun 14, 2023 at 10:33 UTC
It may work, but I disagree that it is a good solution: it will blow up when `$_->{Sub_URL}` contains shell metacharacters, and is a security hole if that variable contains any user input. See Calling External Commands More Safely. In this case I would recommend `systemx` from IPC::System::Simple, or at the very least the multi-argument system (as shown in other replies) with error checking (nobody showed this, but for an example see the first link). sigh	[reply] [d/l] [select]