[lug] Shell commands in interactive mode

[cary miller]

Hi

In tcl interactive mode you have access to shell commands like pwd and
ls.  I wanted python to do that and came up with the following.  This
code goes in pythonstartup.  The nice thing about it is that you just
type
>>> ls
or
>>> pwd
and get exactly what you would see if you typed the same in the shell.

Problems:
    1.  Blank line after the output.  The problem here is __repr__ is
    required to return a string.  Is there any way around this?

    2.  Only works for one-word commands.  Cannot pass options to ls,
    and cannot do this

>>> cat foo.py

    Is there a way to do multiword shell commands??

import os

class ShellCommand:
    def __init__(self,cmd):
        self.cmd=cmd
    def __repr__(self):
        eval('os.system(self.cmd)')
        return ''

pwd = ShellCommand('pwd')
ls = ShellCommand('ls')


Here is the best I aan come up with for cat.


def cat(file):
    for line in open(file).readlines():
        print line,



-- 
Cary Miller
Math Deparment
University of Colorado - Denver
cmiller at math.cudenver.edu
http://www-math.cudenver.edu/~cmiller