Unsynchronized means the readers of the file read whatever they want to read whenever they need to read it.
You can have large number of processes reading a file at exactly the same time. If you have too many you can reach I/O saturation on huge files. On medium sized files the I/O systems kernel memory cache and disk controller cache can easily hold several GB's of data for a group of files on a system that is not starved for memory. On small desktops with 2GB of RAM this will not fly.
That said: two scripts scripta scriptb running in parallel launched from another bigscript
bigscript:
put bigscript in background so you can keep working:
Or. run it with at:
Any output (like errors) will be emailed to your UNIX account.
This User Gave Thanks to jim mcnamara For This Post:
if i have a program (example admintool), if i want to keep a log of what i did in admintool,
can i do this admintool > admintool_log.
i have tried but the system just waits there....
then i did a kill and see the file.
the file has the main menu screen...
basically, i want to keep a log... (3 Replies)
I wanted to know the format everyone uses for cfg files that are called by shell programs. I do mostly sh and ksh scripts and many times I'm modifying an existing script to do another task.
Recently I have been making my scripts more generic and using configuration files to hold uniq details.... (3 Replies)
Hi All,
I have encountered a problem,please help me.
I have a script in which multiple processes are writing on to the same file .
How should I stop this , I mean lock mechanism can be implemented or we can write the at different files and then concatenate the files.
What would be a better... (1 Reply)
Hi,
i want to call two programs simultaneously from a currently running program so as to distribute the job and fasten the speed.
As of now I call the programs one after the other within the main program.
e.g.
`perl A.pl`;
`perl B.pl`;
how can I run the two paralelly?
urgent ... please... (1 Reply)
I was curious how to tell which programs are accessing a file (libobjc.A.dylib) in /usr/lib
This file seems to be the culprit in a bunch of Safari crashes, and I just wanted to know if and what other programs use it.
Also, I was curious what a good way to find out what files are being written... (4 Replies)
Are the programs written on schedulers ,thread library , process management, memory management, et al called systems programs ? How are they different from the programs that implement functions like open() , printf() , scanf() , read() .. they have a prefix sys_open, sys_close, sys_read etc , right... (1 Reply)
Flow of program:
C based CGI is used
CGI1:
-Gets called when user hits upload button(submit) ie form action = CGI1
-Does the file upload (copy to a directory etc)
JS, Ajax fucntion:
-A JS function is called when user hits upload button
-The JS function opens an Ajax request for CGI2... (8 Replies)
Hi,
I'd like to redirect the STDOUT output from my script to a file and simultaneously display it at a console.
I've tried this command:
myscript.sh | tail -f
However, it doesn't end after the script finishes running
I've also tried this:
myscript.sh | tee ~/results.txt
But it writes... (3 Replies)
Hey guys,
Suppose i run passwd via bash shell. It is a suid program, which temporarily runs as root(owner) and modifies the user entries.
However, when i write a C file and give 4755 permission and root ownership to the 'a.out' file , it doesn't run as root in bash shell. I verified this by... (2 Replies)
Hello Team-
we would like to implement an approach which has to write the log file simultaneously
when .sql file is executing by Unix process. At present,it is writing the log file
once the process is completed. I've tested the current process with the below
approaches and none of them... (1 Reply)
Discussion started by: Hima_B
1 Replies
LEARN ABOUT OSX
clogl
CLOG(3) BSD Library Functions Manual CLOG(3)NAME
clog -- complex logarithm function
SYNOPSIS
#include <complex.h>
double complex
clog(double complex z);
long double complex
clogl(long double complex z);
float complex
clogf(float complex z);
DESCRIPTION
clog(z) returns the complex logarithm of z.
clog(conj(z)) = conj(clog(z)), for all complex floating-point numbers z.
SPECIAL VALUES
The conjugate symmetry of clog() is used to abbreviate the specification of special values.
clog(-0 + 0i) returns -inf + Pi i and raises the divide-by-zero flag.
clog(0 + 0i) returns -inf + 0i and raises the divide-by-zero flag.
clog(x + inf i) returns inf + Pi/2 i, for finite x.
clog(x + NaN i) returns NaN + NaN i.
clog(-inf + yi) returns inf + Pi i, for finite positive y.
clog(inf + yi) returns inf + 0i, for finite positive y.
clog(-inf + inf i) returns inf + 3Pi/4 i.
clog(inf + inf i) returns inf + Pi/4 i.
clog(+-inf + NaN i) returns inf + NaN i.
clog(NaN + yi) returns NaN + NaN i, for finite y.
clog(NaN + inf i) returns inf + NaN i.
clog(NaN + NaN i) returns NaN + NaN i.
NOTES SEE ALSO cexp(3)log(3)complex(3)STANDARDS
The clog() function conforms to ISO/IEC 9899:2011.
4th Berkeley Distribution December 11, 2006 4th Berkeley Distribution