I am looking for some advice on wether to use unix or red hat linux? I have played with most windows OS and Mac OS up to in and including OS X. any and all advice would be appreciated (4 Replies)
I have a while read loop cycling through a fixed-length csv file and I'd like to use an if statement to check two fields in each line. I'm basically asking for your suggestions on the best and easiest way to check two fields in each line. I'm sure many of you may be thinking just use awk, but if... (1 Reply)
Hello everyone,
This is my first post here and this is the first time I am using UNIX OS (Slackware). I find it really useful and powerful and would like to master it but as you may guess I am expreicing quite a few problems.
I've been reading a few documentations about it and bash this week... (17 Replies)
Hi.
First of all, Im an msoft guy, and when it comes to linux/unix, I'm retarded.
Here is what I'm trying to do.
I want to
start
I want to automatically connect to a remote server.
Then I need it to login(https)
-insert the licensce in the box(vi)
-based on that licensce, the... (1 Reply)
i am currently running windows vista home premium, i want to install unix because i just started a computer programing course, i am just wondering if i install unix will i still have vista?? how does it work? will i get a choice of which os to run on system startup?? (1 Reply)
Hi everyone. I must admit up front that I am not very strong when it comes to Linux. I am actually a Windows guy, but don't let that count against me. :) I work for a very small company so we do not have a Server/Linux Admin on staff. Most of our needs have been handled by our WebHost. We have... (2 Replies)
Hi guys, looking for a little bit of help. I have been given a task to sift through this massive config of events. I need to find out which event is set up for which ID and each entry looks a little like;
<test1
CONNECT_TYPE = COPY
HOST =
USER =
PASSWORD =... (1 Reply)
Hi all,
I'm a Solaris/linux sysadmin with a good general UNIX skills and with a little tiny background on AIX with no exposure to IBM's hardware ( just reading ) , but i think i can cope with it .
UNIX jobs nowadays are rare here ( i mean hp-ux , solaris , aix ) not linux specially after the... (6 Replies)
OK I have a simple awk script:
$ awk '/03\/11\/10/' foofile|awk -f finderrors.awk
I want to use in the ksh script to so that I can do something like this:
#!/bin/ksh
TODAY=`date +"%D"`
awk /$TODAY/ foofile|awk -f finderrors.awk
The problem I am having is (I believe) is with the special... (3 Replies)
Guys,
Can you tell me what value would additional knowledge of PERL and CGI scripting will add to my skill set of UNIX shell scripting and ORACLE PL/SQL?
I understand that PERL is a good tool for text processing. (1 Reply)
Discussion started by: yabhi_22
1 Replies
LEARN ABOUT OSX
madvise
MADVISE(2) BSD System Calls Manual MADVISE(2)NAME
madvise, posix_madvise -- give advice about use of memory
SYNOPSIS
#include <sys/mman.h>
int
madvise(void *addr, size_t len, int advice);
int
posix_madvise(void *addr, size_t len, int advice);
DESCRIPTION
The madvise() system call allows a process that has knowledge of its memory behavior to describe it to the system. The advice passed in may
be used by the system to alter its virtual memory paging strategy. This advice may improve application and system performance. The behavior
specified in advice can only be one of the following values:
MADV_NORMAL Indicates that the application has no advice to give on its behavior in the specified address range. This is the system
default behavior. This is used with madvise() system call.
POSIX_MADV_NORMAL
Same as MADV_NORMAL but used with posix_madvise() system call.
MADV_SEQUENTIAL Indicates that the application expects to access this address range in a sequential manner. This is used with madvise()
system call.
POSIX_MADV_SEQUENTIAL
Same as MADV_SEQUENTIAL but used with posix_madvise() system call.
MADV_RANDOM Indicates that the application expects to access this address range in a random manner. This is used with madvise() system
call.
POSIX_MADV_RANDOM
Same as MADV_RANDOM but used with posix_madvise() system call.
MADV_WILLNEED Indicates that the application expects to access this address range soon. This is used with madvise() system call.
POSIX_MADV_WILLNEED
Same as MADV_WILLNEED but used with posix_madvise() system call.
MADV_DONTNEED Indicates that the application is not expecting to access this address range soon. This is used with madvise() system call.
POSIX_MADV_DONTNEED
Same as MADV_DONTNEED but used with posix_madvise() system call.
MADV_FREE Indicates that the application will not need the information contained in this address range, so the pages may be reused
right away. The address range will remain valid. This is used with madvise() system call.
MADV_ZERO_WIRED_PAGES
Indicates that the application would like the wired pages in this address range to be zeroed out if the address range is
deallocated without first unwiring the pages (i.e. a munmap(2) without a preceding munlock(2) or the application quits).
This is used with madvise() system call.
The posix_madvise() behaves same as madvise() except that it uses values with POSIX_ prefix for the advice system call argument.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
ERRORS
madvise() fails if one or more of the following are true:
[EINVAL] The value of advice is incorrect.
[EINVAL] The address range includes unallocated regions.
[ENOMEM] The virtual address range specified by the addr and len are outside the range allowed for the address space.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <sys/mman.h>
int
madvise(caddr_t addr, size_t len, int advice);
int
posix_madvise(caddr_t addr, size_t len, int advice);
The include file <sys/types.h> is necessary. The type of addr has changed.
SEE ALSO mincore(2), minherit(2), mprotect(2), msync(2), munmap(2), compat(5)HISTORY
The madvise function first appeared in 4.4BSD. The posix_madvise function is part of IEEE 1003.1-2001 and was first implemented in Mac OS X
10.2.
BSD June 9, 1993 BSD