08-17-2003
just make sure not to run that script as root....someone could put a symbolic link where that /tmp lockfile is to point to /etc/nologin, or worse yet /dev/kmem. etc, etc.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I'm a new member of the forum, I had this new generate file since I use 'grep' and 'awk', what I want to do is get rid off the all 0s before the numbers, is there any one who could help me to figure it out? Thanks a lot!
yun
0000000029 000q7472 2002/03/01
0000000030 000q7472 2002/03/01
... (2 Replies)
Discussion started by: yxiao
2 Replies
2. Shell Programming and Scripting
The following awk script creates a file b.dat.
awk '{print substr($0,1,27),substr($2,index($2,"_")+1)," ",substr($0,49)}' a.dat > b.dat
I need this script to be modified to also sum $3 values by distinct $1 and $2
fields.
Current file
W2_2009275 2 8
W2_2009275 2 7
W1_2009275 1... (3 Replies)
Discussion started by: mnnarendra
3 Replies
3. Programming
Hi,
I wanted to know if i can write a program using switches and signals, etc to trace execution of other unix program which calls c program internally.
If yes how? If not with signals and switches then are there any other methods apart from debugging with gdb/dbx. (3 Replies)
Discussion started by: jiten_hegde
3 Replies
4. UNIX for Dummies Questions & Answers
Hi,
i want to write a script that executes a program (exec?) .
this program then requires a filename as input.
how do i give it this input in the script so the program will be complete run and close by the script.
e.g.
exec prog.exe
program then asks for filename
"enter filename:"... (1 Reply)
Discussion started by: tuathan
1 Replies
5. Shell Programming and Scripting
Hello,
I am trying to convert lines from text file, I got lines in text files like that
ALPHA.cab
tomtom.cab
vgame.cab
converter.cabWhat i want to do is I want to conver these lines like that,
cabwiz.exe ALPHA.cab extract "C:\1extract\ALPHA"
cabwiz.exe tomtom.cab extract ... (5 Replies)
Discussion started by: davidkhan
5 Replies
6. Programming
I wrote a simple program that generates a random word 10,000,000 times.
I wrote it in python, then in C++ and compared the two completion times. The python script was faster! Is that normal? Why would the python script be faster? I was under the impression that C++ was faster. What are some of... (2 Replies)
Discussion started by: cbreiny
2 Replies
7. Homework & Coursework Questions
Long story short: I'm working inside of a Unix SSH under a bash shell. I have to code a C program that generates a random number. Then I have to call the compiled C program with a Perl program to run the C program 20 times and put all the generated random #s into a text file, then print that text... (1 Reply)
Discussion started by: jdkirby
1 Replies
8. Shell Programming and Scripting
Hi,
I have a file that looks like this:
27+:<10,289808,1>
31+:<11,1445372,1>
33-:<7,1014101,2>
35+:<11,728811,1>
36-:<11,1445205,0>
37+:<11,1445792,2>
and I want to change it to this:
+ 10 289808
+ 11 1445372
- 7 1014101
+ 11 728811
- 11 1445205
+ 11 1445792 (3 Replies)
Discussion started by: kylle345
3 Replies
9. Shell Programming and Scripting
awk "BEGIN {if($PERCENT<$WARNING)
{print \"OK\" ; exit 0}
else if(($PERCENT>=$WARNING) && ($PERCENT<$CRITICAL))
{print \"WARNING\" ; exit 1}
else if($PERCENT>=$CRITICAL)
{print \"CRITICAL\" ; exit 2}
}"
how can i... (1 Reply)
Discussion started by: SkySmart
1 Replies
10. Shell Programming and Scripting
I created a program, so a kid can practice there math on it. It dispenses varies math problems and the kid must input an answer. I also want it to grade the work they have done, but I can't find the best place for it to print out the grade.
I have:
if ( $response =~ m/^/ ) {
$user_wants_to_quit... (1 Reply)
Discussion started by: germany1517
1 Replies
MEM(4) Linux Programmer's Manual MEM(4)
NAME
mem, kmem, port - system memory, kernel memory and system ports
DESCRIPTION
mem is a character device file that is an image of the main memory of the computer. It may be used, for example, to examine (and even
patch) the system.
Byte addresses in mem are interpreted as physical memory addresses. References to nonexistent locations cause errors to be returned.
Examining and patching is likely to lead to unexpected results when read-only or write-only bits are present.
It is typically created by:
mknod -m 660 /dev/mem c 1 1
chown root:kmem /dev/mem
The file kmem is the same as mem, except that the kernel virtual memory rather than physical memory is accessed.
It is typically created by:
mknod -m 640 /dev/kmem c 1 2
chown root:kmem /dev/kmem
port is similar to mem, but the I/O ports are accessed.
It is typically created by:
mknod -m 660 /dev/port c 1 4
chown root:mem /dev/port
FILES
/dev/mem
/dev/kmem
/dev/port
SEE ALSO
chown(1), mknod(1), ioperm(2)
COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 1992-11-21 MEM(4)