Pipes and fifos cannot overflow.
...
With one process reading from a pipe and another writing to a pipe, they will take turns running.
In fact, this sort of mechanism works very well when having to export Oracle data when the data exceeds 2 GB and the Oracle exp utility doesn't support large filesystems.
I would like to know if the following can be done.
route output from an sql select directly to a pipe and compress it at the same time.
regards
Albert (2 Replies)
I currently stuck on a simple program that requires unix pipe. I'm have never programmed with unix pipe before, so if anyone can point me to the right different will be greatly appreciated!
I'm suppose to write a program that the parent spawns many child processes and each of the child process... (1 Reply)
Could one of you shad some light on this:
I need to split the file by determining the record count and than splitting it up into 4 files. Please note, this is not a fixed record length but rather a "|" delimited file.
I am not sure as how to handle reminder/offset for the 4th file.
For... (4 Replies)
Looking for examples/definition of what the term Pipe means in UNIX. Please provide answers and illustrations if possible or direction. Thanks!:) (5 Replies)
I am pretty new to UNIX. My client has a requirement where in a directory we have some files with somewhat similar name
like test_XX.txt, test_XY.txt, test_XZ.txt, test_ZZ.txt, test_ZY.txt, test_ZX.txt, test_YY.txt......Out of these files
few files have 0 bytes. Is there a way where we can go... (7 Replies)
I am trying to convert a txt file that includes one long string of data. The lines are separated with hex value 7C (for pipe).
I am trying to process this file using SQR (Peoplesoft) so I thought the easiest thing to do would be to replace the eol char with a CRLF in unix so I can just... (4 Replies)
EDIT: Nevermind, called a friend who is good at this stuff and he figured it out :D
Hi all,
So I'm trying to teach myself to write programs for unix in c. I am currently creating a program, and I need to pass a struct through a pipe, but I can't figure out how.
The struct I want to pass... (0 Replies)
Hi
I am new to Unix Shell scripting have a requirement where I have to replace the "unix 1 byte delimiter" with the "pipe" separator and also remove any carriage returns and line feeds if any
The Source File
4 QFH Jungle Hill 32-34 City Road London SE23 3UX
the output should be ... (3 Replies)
I have created a fifo named pipe in solaris, which writes the content of a file, line by line, into pipe as below:
$ mkfifo namepipe
$ cat books.txt
"how to write unix code"
"how to write oracle code"
$ cat books.txt >> namepipe &
I have a readpipe.sh script which reads the named... (2 Replies)
Hi All,
I'm creating a program which reads millions of bytes from the PIPE and do some processing. As the data is more, the idea is to read the pipe parallely.
Sun Solaris 8
See the code below:
#!/bin/sh
MAXTHREAD=30
awk '{print $1}' metadata.csv > nvpipe &
while
do
... (3 Replies)
Discussion started by: mr_manii
3 Replies
LEARN ABOUT SUNOS
expl
exp(3M) Mathematical Library Functions exp(3M)NAME
exp, expf, expl - exponential function
SYNOPSIS
cc [ flag... ] file... -lm [ library... ]
#include <math.h>
double exp(double x);
float expf(float x);
long double expl(long double x);
DESCRIPTION
These functions compute the base-e exponential of x.
RETURN VALUES
Upon successful completion, these functions return the exponential value of x.
If the correct value would cause overflow, a range error occurs and exp(), expf(), and expl() return HUGE_VAL, HUGE_VALF, and HUGE_VALL,
respectively.
If x is NaN, a NaN is returned.
If x is +-0, 1 is returned.
If x is +Inf, x is returned.
For exceptional cases, matherr(3M) tabulates the values to be returned by exp() as specified by SVID3 and XPG3. See standards(5).
ERRORS
These functions will fail if:
Range Error The result overflows.
If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the overflow floating-point exception is raised.
The exp() function sets errno to ERANGE if the result overflows.
USAGE
An application wanting to check for exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if
fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception has been raised. An application should
either examine the return value or check the floating point exception flags to detect exceptions.
An application can also set errno to 0 before calling exp(). On return, if errno is non-zero, an error has occurred. The expf() and expl()
functions do not set errno.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO feclearexcept(3M), fetestexcept(3M), isnan(3M), log(3M), math.h(3HEAD), matherr(3M), mp(3MP), attributes(5), standards(5)SunOS 5.10 1 Nov 2003 exp(3M)