hehe not classroom check my IP i'm working at office
---------- Post updated 09-25-09 at 01:43 AM ---------- Previous update was 09-24-09 at 06:17 PM ----------
google answered me, i don't know why people start not to help each others anymore on forums, it seems forums gonna eventually die like IRC channels when it was so popular in 90s
Lets say I have a file abc.txt and it has about 35 million rows. I would like to take a sample of 100 random rows from that file for my testing purpose and write it to a file say test.txt.
How do I do this operation?
Thanks,
Sashank (9 Replies)
Hi!
I need to read in the first line from a text file (which will only ever have one line in it), so I tried this....
while read line
do
echo $line
done < $file
But this wasn't returning anything. So I tired a different file, which had multiple lines of text in it, and it returned... (2 Replies)
Hello,
I have got a script that reads a text file, and have got three problems that I an struggling with.
1. The script does not read the last line in the text file
2. within the second 'elif' within the script I included a 'break' - the script runs successfully (except for the first... (2 Replies)
Hi everyone,
I am writing a BASH shell script that I will use to process data files. I have a text file that contains the names of the files to be processed, for example:
cat filenames.txt
file1
file2
file3
file4
file5
What I would like to do is set up a FOR loop within my script... (2 Replies)
Hi ,
I am trying to write an shell, which reads a text file (from a location) having a list of numbers of strictly 5 digits only ex: 33144
Now my script will check :
1) that each entry is only 5 digits & numeric only, no alphabets, & its not empty.
2)then it executes a shell script called... (8 Replies)
I have list of files in a directory 'dir'. Each file is of type HTML. I need to read each file and get the string which starts with 'http' and write them in a new text file. How can i do this shell scripting?
file1.html
<head>
<url>http://www.google.com</url>
</head>
file2.html
<head>... (6 Replies)
performing this code to read from file and print each character in separate line
works well with ASCII encoded text
void
preprocess_file (FILE *fp)
{
int cc;
for (;;)
{ cc = getc (fp);
if (cc == EOF)
break;
printf ("%c\n", cc);
}
}
int
main(int... (1 Reply)
I have a test file that I want to read and insert only certain lines into the
the table based on a filter.
1. Rread the log file 12 Hours back Getdate() -12 Hours
2. Extract the following information on for lines that say "DUMP is
complete"
A. Date
B. Database Name
C.... (2 Replies)
i have a text file as belows, it includes 2 columns, 1st is the column name, 2nd is the file_name
data_file.txt
column_name file_name
col1 file1
col2 file2
col3 file1
col4 file1
col5 file2
now, i would like to... (4 Replies)
Discussion started by: tester111
4 Replies
LEARN ABOUT SUNOS
srand
rand(3C) Standard C Library Functions rand(3C)NAME
rand, srand, rand_r - simple random-number generator
SYNOPSIS
#include <stdlib.h>
int rand(void);
void srand(unsigned int seed);
int rand_r(unsigned int *seed);
DESCRIPTION
The rand() function uses a multiplicative congruential random-number generator with period 2**32 that returns successive pseudo-random num-
bers in the range of 0 to RAND_MAX (defined in <stdlib.h>).
The srand() function uses the argument seed as a seed for a new sequence of pseudo-random numbers to be returned by subsequent calls to
rand(). If srand() is then called with the same seed value, the sequence of pseudo-random numbers will be repeated. If rand() is called
before any calls to srand() have been made, the same sequence will be generated as when srand() is first called with a seed value of 1.
The rand_r() function has the same functionality as rand() except that a pointer to a seed seed must be supplied by the caller. If
rand_r() is called with the same initial value for the object pointed to by seed and that object is not modified between successive calls
to rand_r(), the same sequence as that produced by calls to rand() will be generated.
The rand() and srand() functions provide per-process pseudo-random streams shared by all threads. The same effect can be achieved if all
threads call rand_r() with a pointer to the same seed object. The rand_r() function allows a thread to generate a private pseudo-random
stream by having the seed object be private to the thread.
USAGE
The spectral properties of rand() are limited. The drand48(3C) function provides a better, more elaborate random-number generator.
When compiling multithreaded applications, the _REENTRANT flag must be defined on the compile line. This flag should be used only in mul-
tithreaded applications.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Safe |
+-----------------------------+-----------------------------+
SEE ALSO drand48(3C), attributes(5), standards(5)SunOS 5.10 19 May 2004 rand(3C)
09-28-2009
