Hi,
I want to use python as a "shell like" program, and execute an external program in it( such as mv, cp, tar, gnuplot) I tried:
Since you appear to be on a *nix system, a good choice is the proctools module in the pyNMS package.
http://sourceforge.net/projects/pynms
os.execv("/bin/bash",("/usr/bin/gnuplot",'-c "gnuplot < plot.tmp"'))
You could do this:
import proctools
proctools.spawnpipe("gnuplot plot.tmp")You can keep your existing Python 2.3 installation, as well.
1. why my exec(..) command doesn't work?
It replaces your current process.
2. exec* must be with fork ?
in this case, yes. but proctools does that for you.
3. In what situation, we choose one over another ?
The fork-and-exec is a common pattern in *nix for spawning another process. However, there are libraries in Python that do that for you. See above.
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