Execute a system command: Difference between revisions

Because of a quirk in the implementation ([http://cmake.org/gitweb?p=cmake.git;a=blob;f=Source/cmExecuteProcessCommand.cxx;hb=HEAD cmExecuteProcessCommand.cxx] and [http://cmake.org/gitweb?p=cmake.git;a=blob;f=Source/kwsys/ProcessUNIX.c;hb=HEAD ProcessUNIX.c]), CMake diverts the standard output to a pipe. The effect is like running <code>ls | cat</code> in the shell. The ''ls'' process inherits the original standard input and standard error, but receives a new pipe for standard output. CMake then reads this pipe and copies all data to the original standard output.

 

 

<lang cmake># Calculate pi to 40 digits after the decimal point.

print(`failed to execute ls: $problem`)

}</lang>

 

=={{header|Erlang}}==