59 lines
1.5 KiB
Python
59 lines
1.5 KiB
Python
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#! /usr/bin/env python
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"""repeat <shell-command>
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This simple program repeatedly (with 1-second intervals) executes the
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shell command given on the command line and displays the output (or as
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much of it as fits on the screen). It uses curses to paint each new
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output on top of the old output, so that if nothing changes, the
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screen doesn't change. This is handy to watch for changes in e.g. a
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directory or process listing.
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To end, hit Control-C.
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"""
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# Author: Guido van Rossum
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# Disclaimer: there's a Linux program named 'watch' that does the same
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# thing. Honestly, I didn't know of its existence when I wrote this!
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# To do: add features until it has the same functionality as watch(1);
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# then compare code size and development time.
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import os
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import sys
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import time
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import curses
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def main():
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if not sys.argv[1:]:
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print __doc__
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sys.exit(0)
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cmd = " ".join(sys.argv[1:])
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p = os.popen(cmd, "r")
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text = p.read()
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sts = p.close()
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if sts:
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print >>sys.stderr, "Exit code:", sts
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sys.exit(sts)
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w = curses.initscr()
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try:
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while 1:
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w.erase()
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try:
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w.addstr(text)
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except curses.error:
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pass
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w.refresh()
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time.sleep(1)
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p = os.popen(cmd, "r")
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text = p.read()
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sts = p.close()
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if sts:
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print >>sys.stderr, "Exit code:", sts
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sys.exit(sts)
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finally:
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curses.endwin()
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main()
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