Could someone recommend a good book? Regarding Unix and Mac os X? I know the OS is new, but Unix ain't.
I would like to know more about setting up the webserver on my machine. All the HTML works fine, it's just when i try to execute a cgi, php or a pl script.. :( I have tried and tried to... (2 Replies)
Hi,
suppose you have the following line at your crontab :
5 * * * * /usr/mine/script > /dev/null 2>&1
now i understood that the " > /dev/null 2>&1 outputs both Standard outpout and Standard Error messages to the /dev/null device or file...
the first part , " > /dev/null " transfers... (1 Reply)
Hello all. I am receiving this message on the console of a SCO Openserver 5.0.7 server. The hardware is IBM, running mirrored SCSI drives with a hot-swap spare off of an IBM Serveraid controller. I suspect that some permutation of fsck can help me resolve whatever is causing the error, but I am... (0 Replies)
How are these two different? They both prevent output and error from being displayed. I don't see the use of the "&"
echo "hello" > /dev/null 2>&1
echo "hello" > /dev/null 2>1 (3 Replies)
This thread is about using tar & other compression utilities on AIX ;
1. Find out which version of tar you are using
thanks to bakunin
>what $(which tar)
/usr/bin/tar:
61 1.14 src/bos/usr/ccs/lib/libc/__threads_init.c, libcthrd, bos53 0 7/11/00 12:04:14
10 ... (21 Replies)
Hello
Can I just remove/delete flile ?
rw-r--r-- 1 root system 2385088512 Jun 30 21:25 /dev/null 2>&1
size of this flile is 2274.75 m and fill up my filesystem:
Filesystem MB blocks Used Free %Used Mounted on
/dev/hd4 2560.00 2558.59 1.41 100% / (10 Replies)
Hello,
Does anyone know how to housekeeping the null 2>&1 file in /dev?
its fill up my system, please help.
Thanks :b: (3 Replies)
Discussion started by: only
3 Replies
LEARN ABOUT PHP
sysinfo
SYSINFO(2) Linux Programmer's Manual SYSINFO(2)NAME
sysinfo - return system information
SYNOPSIS
#include <sys/sysinfo.h>
int sysinfo(struct sysinfo *info);
DESCRIPTION
sysinfo() returns certain statistics on memory and swap usage, as well as the load average.
Until Linux 2.3.16, sysinfo() returned information in the following structure:
struct sysinfo {
long uptime; /* Seconds since boot */
unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
unsigned long totalram; /* Total usable main memory size */
unsigned long freeram; /* Available memory size */
unsigned long sharedram; /* Amount of shared memory */
unsigned long bufferram; /* Memory used by buffers */
unsigned long totalswap; /* Total swap space size */
unsigned long freeswap; /* Swap space still available */
unsigned short procs; /* Number of current processes */
char _f[22]; /* Pads structure to 64 bytes */
};
In the above structure, the sizes of the memory and swap fields are given in bytes.
Since Linux 2.3.23 (i386) and Linux 2.3.48 (all architectures) the structure is:
struct sysinfo {
long uptime; /* Seconds since boot */
unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
unsigned long totalram; /* Total usable main memory size */
unsigned long freeram; /* Available memory size */
unsigned long sharedram; /* Amount of shared memory */
unsigned long bufferram; /* Memory used by buffers */
unsigned long totalswap; /* Total swap space size */
unsigned long freeswap; /* Swap space still available */
unsigned short procs; /* Number of current processes */
unsigned long totalhigh; /* Total high memory size */
unsigned long freehigh; /* Available high memory size */
unsigned int mem_unit; /* Memory unit size in bytes */
char _f[20-2*sizeof(long)-sizeof(int)];
/* Padding to 64 bytes */
};
In the above structure, sizes of the memory and swap fields are given as multiples of mem_unit bytes.
RETURN VALUE
On success, sysinfo() returns zero. On error, -1 is returned, and errno is set to indicate the cause of the error.
ERRORS
EFAULT info is not a valid address.
VERSIONS
sysinfo() first appeared in Linux 0.98.pl6.
CONFORMING TO
This function is Linux-specific, and should not be used in programs intended to be portable.
NOTES
All of the information provided by this system call is also available via /proc/meminfo and /proc/loadavg.
SEE ALSO proc(5)COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 SYSINFO(2)