IPC::Open3 works like IPC::Open2.
use IPC::Open3; $pid = open3($wtr, $rdr, $err, $cmd_with_args); $pid = open3($wtr, $rdr, $err, $cmd, "arg1", "arg2", ...);
The following differences apply:
The first two arguments ($wtr and $rdr) are passed in the opposite order.
A third filehandle can be passed, for standard error. If this argument is given as ", then STDERR and STDOUT for $cmd are on the same filehandle.
If $wtr begins with <, then the leading < is stripped from the name, and the remainder is assumed to be a regular filehandle for an open file, rather than a reference to a typeglob. open3 opens this file as STDIN for $cmd and closes it in the parent. Likewise, if $rdr or $err begins with >, then $cmd directs STDOUT or STDERR directly to that file rather than to the parent.
| 8.134. IPC::Open2 | 8.136. IPC::Semaphore |
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