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80 lines
2.2 KiB
Python
Executable file
80 lines
2.2 KiB
Python
Executable file
#! /usr/bin/env python3
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"""repeat [-i SECONDS] <shell-command>
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This simple program repeatedly (at 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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The -i option lets you override the sleep time between executions.
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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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import getopt
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def main():
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interval = 1.0
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try:
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opts, args = getopt.getopt(sys.argv[1:], "hi:")
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except getopt.error as err:
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print(err, file=sys.stderr)
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sys.exit(2)
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if not args:
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print(__doc__)
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sys.exit(0)
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for opt, arg in opts:
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if opt == "-i":
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interval = float(arg)
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if opt == "-h":
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print(__doc__)
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sys.exit(0)
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cmd = " ".join(args)
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cmd_really = cmd + " 2>&1"
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p = os.popen(cmd_really, "r")
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text = p.read()
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sts = p.close()
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text = addsts(interval, cmd, text, sts)
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w = curses.initscr()
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try:
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while True:
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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(interval)
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p = os.popen(cmd_really, "r")
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text = p.read()
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sts = p.close()
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text = addsts(interval, cmd, text, sts)
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finally:
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curses.endwin()
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def addsts(interval, cmd, text, sts):
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now = time.strftime("%H:%M:%S")
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text = "%s, every %g sec: %s\n%s" % (now, interval, cmd, text)
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if sts:
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msg = "Exit status: %d; signal: %d" % (sts>>8, sts&0xFF)
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if text and not text.endswith("\n"):
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msg = "\n" + msg
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text += msg
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return text
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main()
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