https://en.cppreference.com/w/cpp/utility/program/system
On Tue, 10 Mar 2020 at 08:22, Frederick Gotham via Boost-users < [email protected]> wrote: > At the command line on most operating system, you can pipe a file into > another program and then pipe out into a third program. > > For example: Take a file from the hard disk, decrypt it, and then unzip it: > > openssl rc4-40 -salt -d -pass pass:MyPassword < > /home/frederick/monkey.tar.gz.encrypted > tar -zxf - > > I realise, when using Boost::Process, that we can tie the input and > output streams of child processes together using 'ipstream', but I > want to be able to take the above command and give it directly to the > operating system (or to the 'shell'). > > On Linux x64 and armhf(32-Bit), the following works: > > child c(search_path("sh"), > "-c", > "openssl rc4-40 -salt -d -pass pass:MyPassword < > /home/frederick/monkey.tar.gz.encrypted > tar -zxf -" > ); > > But should I have to hardcode "sh" and "-c" into my program like that? > I have tried using "shell" like this: > > child c( "openssl rc4-40 -salt -d -pass pass:MyPassword < > /home/frederick/monkey.tar.gz.encrypted > tar -zxf -", > shell > ); > > but this doesn't work on either Linux x64 or armhf(32-Bit). I thought > the whole point of "shell" was that you didn't have to hardcode "sh > -c" in Linux or "cmd /c" in MS-Windows. > > Also if you do some web-searching for how to run a batch file in > MS-Windows using boost::process, you'll see that everyone is doing > this: > > context ctx; > ctx.environment = self::get_environment(); > child c = launch("cmd", "/c batch.bat", ctx); > > Should it be necessary to hardcode "cmd /c" like that? Shouldn't this > all be taken care of by "boost::process::shell"? > > Frederick > _______________________________________________ > Boost-users mailing list > [email protected] > https://lists.boost.org/mailman/listinfo.cgi/boost-users > -- @systemdeg "We value your privacy, click here!" Sod off! - degski "Anyone who believes that exponential growth can go on forever in a finite world is either a madman or an economist" - Kenneth E. Boulding "Growth for the sake of growth is the ideology of the cancer cell" - Edward P. Abbey
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