From mboxrd@z Thu Jan  1 00:00:00 1970
From: arisawa <arisawa@ar.aichi-u.ac.jp>
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Message-Id: <7963B664-4127-47A3-B8CF-88FA70C52AA6@ar.aichi-u.ac.jp>
Date: Tue,  1 Oct 2013 20:34:20 +0900
To: 9fans@9fans.net
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Subject: [9fans] bug? test f -older t
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Hello,

Am I missing something?
It seems logic is inverted to me.

Kenji Arisawa

maia% ls -l
...
--rw-rw-r-- M 323 arisawa arisawa         0 Sep 29 06:29 x
--rw-rw-r-- M 323 arisawa arisawa        14 Sep 28 17:50 z
maia% mtime x
 1380403777 x
maia% if(test z -older 1380403777) echo older
maia% if(! test z -older 1380403777) echo older
older
maia%


man test(1)
          f -older t True if file f is older than (modified before)
                     time t. If t is a integer followed by the letters
                     y(years), M(months), d(days), h(hours),
                     m(minutes), or s(seconds), it represents current
                     time minus the specified time.  If there is no
                     letter, it represents seconds since epoch.  You
                     can also concatenate mixed units.  For example,
                     3d12h means three days and twelve hours ago.

the source code /sys/src/cmd/test.c
int
isolder(char *pin, char *f)
{
	int r;
	ulong n, m;
	char *p = pin;
	Dir *dir;

	dir = dirstat(f);
	if (dir == nil)
		return 0;

	/* parse time */
	n = 0;
	while(*p){
		m = strtoul(p, &p, 0);
		switch(*p){
		case 0:
			n = m;
			break;
		case 'y':
			m *= 12;
			/* fall through */
		case 'M':
			m *= 30;
			/* fall through */
		case 'd':
			m *= 24;
			/* fall through */
		case 'h':
			m *= 60;
			/* fall through */
		case 'm':
			m *= 60;
			/* fall through */
		case 's':
			n += m;
			p++;
			break;
		default:
			synbad("bad time syntax, ", pin);
		}
	}

	r = dir->mtime + n < time(0);
	free(dir);
	return r;
}