11-01-2007
That means the virtual address, say 20000000 to keep things simple, for each process gets mapped to a different physical address by the OS.
Examples:
process 2416 address 20000000 = real address 0x23456666
process 2082 address 20000000 = real address 0x12347777
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Still a Beginner here ..
Does anyone no how to get the IP address of the machine thats logged in (bearing in mind there will be others logged in) while they are logged in to the Unix server and pass this as a variable to a shell script so as I can FTP files to that machine via a shell script, at... (2 Replies)
Discussion started by: Gerry405
2 Replies
2. UNIX for Dummies Questions & Answers
I'm attempting to append a line after a specific address with sed. If I type in the address eg.3 then it will append after the third line. I can't get it to work with a variable though. Does anyone know how to do it please?
sed '/3/a\
text' filename :)
sed '/\$address/a\
text' filename... (8 Replies)
Discussion started by: Sniper Pixie
8 Replies
3. UNIX for Dummies Questions & Answers
Hi there,
I need help on setting the path variable. How can I set the path variable with Bourne Shell. My scripts goes like this, but did not work.
#!/bin/sh
PATH=/usr/bin:/usr/ucb:/etc:/export/home/zchen/home
export PATH
Thanks,
Z (4 Replies)
Discussion started by: randomcz
4 Replies
4. Shell Programming and Scripting
Hi,
I am having a variable
Like
line="/dir1/dir2/gr3/file.ksh"
I need to get the /dir1/dir2/gr3 alone. the no of directories may differ at each time.
Please advice. thanks in advance. (3 Replies)
Discussion started by: vanathi
3 Replies
5. Shell Programming and Scripting
Hello,
i have another sed question.. I'm trying to do variable substition with sed and i'm running into a problem.
my var1 is a string constructed like this:
filename1 filerev1 filepath1
my var2 is another string constructed like this:
filename2 filerev2 filepath2
when i do... (2 Replies)
Discussion started by: alrinno
2 Replies
6. UNIX for Dummies Questions & Answers
By using a csh, I want to address a variable content whose name is/matches the content of a given other variable.
i.e.
set name=´sam´
set ${name}_age=´27´
So, by typing: echo ${name}_age
I correctly obtain: sam_age
By typing: echo $sam_age
or echo ${sam_age}
I correctly obtain: 27
... (1 Reply)
Discussion started by: sobolev
1 Replies
7. Shell Programming and Scripting
Hi
I need a script which will remove a path from PATH environment variable. For example
$echo PATH
/usr/local/bin:/usr/bin:test/rmve:/usr/games
$echo rmv
test/rmve
Here I need a shell script which will remove rmv path (test/rmve) from PATH... (9 Replies)
Discussion started by: madhu84
9 Replies
8. Shell Programming and Scripting
Hi,
Could anyone help me in writing a single line code by either using (sed, awk, perl or whatever) to extract a specific path from the PATH environment variable?
for eg: suppose the PATH is being set as follows
PATH=/usr/bin/:/usr/local/bin:/bin:/usr/sbin:/usr/bin/java:/usr/bin/perl3.4
... (2 Replies)
Discussion started by: royalibrahim
2 Replies
9. Shell Programming and Scripting
Hello Folks,
I want to append a path in user's PATH variable which should be available in current session.
Background
Numerous persons will run a utility.
Aim is to add the absolute path of the utility the first time it runs so that next runs have the PATH in env & users can directly run... (6 Replies)
Discussion started by: vibhor_agarwali
6 Replies
10. Shell Programming and Scripting
Hi I'm trying to select text between two lines, I'm using sed to to this, but I need to pass variables to it. For example
start="BEGIN /home/mavkoup/data"
end="END"
sed -n -e '/${start}/,/${end}/g' doesn't work. I've tried double quotes as well. I think there's a problem with the / in the... (4 Replies)
Discussion started by: mavkoup
4 Replies
PHYS(2) System Calls Manual PHYS(2)
NAME
phys - allow a process to access physical addresses (2BSD)
SYNOPSIS
phys(segreg, size, physaddr)
unsigned int segreg, size, physaddr;
DESCRIPTION
The argument segreg specifies a process virtual (data-space) address range of 8K bytes starting at virtual address segregx8K bytes. This
address range is mapped into physical address physaddrx64 bytes. Only the first sizex64 bytes of this mapping is addressable. If size is
zero, any previous mapping of this virtual address range is nullified. For example, the call
phys(7, 1, 0177775);
will map virtual addresses 0160000-0160077 into physical addresses 017777500-017777577. In particular, virtual address 0160060 is the
PDP-11 console located at physical address 017777560.
This call may only be executed by the super-user.
ERRORS
[EPERM] The process's effective user ID is not the super-user.
[EINVAL] Segreg is less than 0 or greater than 7.
[EINVAL] Size is less than 0 or greater than 128.
SEE ALSO
PDP-11 segmentation hardware
BUGS
On systems with ENABLE/34(tm) memory mapping boards, phys cannot be used to map in the I/O page.
This system call is very dangerous. It is not considered a permanent part of the system.
Phys is unique to the PDP-11 and 2BSD; its use is discouraged.
3rd Berkeley Distribution January 22, 1987 PHYS(2)