02-03-2017
Quote:
Originally Posted by
RudiC
Why should grep s try to match an S ? And, recheck your conclusions (what does and when applies the || ?).
Just making sure we're not talking past each other here. The file names are all supposed to be lower case. So
grep s is only looking for a lower case "s".
|| Now I see, I believe switched that up. You only reach the right side, when the left side is false.
So to summarize
1. I'm kinda at a loss here. The answer is probably super simple, but I just don't get it. Could it be only 1 time. Since we don't reach that part anymore because there's no loop for it?
2. 15 times.
3. 8 times, since we only reach
grep r, when there's no "s" in a file name.
4. 2 times, since there are only 2 items with neither "s" or "r"
5. 1 time.
EDIT: WAIT, now I get it.
1. 16 times. Since we have 15 files and then another time for the EoF.
2. 15 times. Because we have to check every single one for an "s"
3. 8 times. Since
grep s is false 8 times.
4. 2 times. Since that's the amount of items with neither an "s" nor an "r".
5. 1 time.
Last edited by Eggsy; 02-03-2017 at 10:52 AM..
Reason: I think I got it
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times(2) System Calls times(2)
NAME
times - get process and child process times
SYNOPSIS
#include <sys/times.h>
#include <limits.h>
clock_t times(struct tms *buffer);
DESCRIPTION
The times() function fills the tms structure pointed to by buffer with time-accounting information. The tms structure, defined in
<sys/times.h>, contains the following members:
clock_t tms_utime;
clock_t tms_stime;
clock_t tms_cutime;
clock_t tms_cstime;
All times are reported in clock ticks. The specific value for a clock tick is defined by the variable CLK_TCK, found in the header <lim-
its.h>.
The times of a terminated child process are included in the tms_cutime and tms_cstime members of the parent when wait(3C) or waitpid(3C)
returns the process ID of this terminated child. If a child process has not waited for its children, their times will not be included in
its times.
The tms_utime member is the CPU time used while executing instructions in the user space of the calling process.
The tms_stime member is the CPU time used by the system on behalf of the calling process.
The tms_cutime member is the sum of the tms_utime and the tms_cutime of the child processes.
The tms_cstime member is the sum of the tms_stime and the tms_cstime of the child processes.
RETURN VALUES
Upon successful completion, times() returns the elapsed real time, in clock ticks, since an arbitrary point in the past (for example, sys-
tem start-up time). This point does not change from one invocation of times() within the process to another. The return value may overflow
the possible range of type clock_t. If times() fails, (clock_t)-1 is returned and errno is set to indicate the error.
ERRORS
The times() function will fail if:
EFAULT The buffer argument points to an illegal address.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
time(1), timex(1), exec(2), fork(2), time(2), waitid(2), wait(3C), waitpid(3C), attributes(5), standards(5)
SunOS 5.10 14 May 1997 times(2)