1. Open an editor in linux Example vi editor
2. Write a simple program and save it as progra1.c
#include <stdio.h>
int main (void)
{
printf ("Programming is fun.\n");
return 0;
}
3. compile the program : $ gcc prog1.c
4. Run the program : ./a.out
Or
5.you can give it a different name : gcc prog1.c –o prog1
Now run the program [...]
Octal Permission:
0 — 000 All types of access are denied
1 –x 001 Execute access is allowed only
2 -w- 010 Write access is allowed only
3 -wx 011 Write and execute access are allowed
4 r– 100 Read access is allowed only
5 r-x 101 Read and execute access are allowed
6 rw- 110 Read and write access are allowed
7 [...]
Ref: Optimizing Linux® Performance: A Hands-On Guide to Linux® Performance Tools
Ref:http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/admin-primer/s1-resource-what-to-monitor.html
Ref:http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/admin-primer/s1-resource-rhlspec.html
Basic explanation of memory related words:
Swap (Not Enough Physical Memory)
All systems have a fixed amount of physical memory in the form of RAM chips.
The Linux kernel allows applications to run even if they require more memory
than available with the physical memory.The Linux kernel uses [...]
To find out, if Your kernel is 64 bit or 32 bit, run this commands
uname -a
Sample Out put for 64 bit kernel :
How many CPU in the system :
commands : cat /proc/cpuinfo
[root@server ~]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name [...]
Make sure the IP of the server and the Ip in Virutal host (ssl configuraiton ) are same.
<VirtualHost xx.xx.xx.xx:443>
</VirtualHost>