10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
In the below awk if I use the attached file as the input, I get no results for TCF4. However, if I just copy that line from the attached file and use that as input I get results for TCF4.
Basically the gene file is a 1 column list that is used to filter $8 of the attached file. When there is a... (9 Replies)
Discussion started by: cmccabe
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2. UNIX for Advanced & Expert Users
Hello
I have a data set which looks like this :
progeny sire dam gender
12 1 3 M
13 2 4 F
14 2 5 F
15 6 5 ... (13 Replies)
Discussion started by: sajmar
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3. Shell Programming and Scripting
Need to use dd to generate a large file from a sample file of random data. This is because I don't have /dev/urandom.
I create a named pipe then:
dd if=mynamed.fifo do=myfile.fifo bs=1024 count=1024
but when I cat a file to the fifo that's 1024 random bytes:
cat randomfile.txt >... (7 Replies)
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4. Shell Programming and Scripting
Hello Unix experts,
I need a help to create a subset file. I know with cut comand, its very easy to select many different columns, or threshold. But here I have a bit problem as in my data file is big. And I don't want to identify the column numbers or names manually. I am trying to find any... (7 Replies)
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5. UNIX for Dummies Questions & Answers
Hi,
I'd like to swap the columns 1 and 2 of a space-delimited text file but only for the first 1000 rows. How do I go about doing that? Thanks! (1 Reply)
Discussion started by: evelibertine
1 Replies
6. UNIX for Dummies Questions & Answers
Dear all,
I have a file lik below: n of row=420, n of letters in each row=100000 like below: there is no space between the letters.
what I want is: the 75000th letter to the 85000th letter in each row.
how to do that? thanks a lot!
... (2 Replies)
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7. Shell Programming and Scripting
OK, I am stumpped. I have this shell Script that I want to randomly select a file with the extention of .sct. Then using a portion of its file name select the six related .mot files. Then move them all to another folder. I also need a user input form for the number of .SCT files to randomly select... (6 Replies)
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8. Shell Programming and Scripting
Hi All,
I have some 6000 text files in a directory. My files are named like 1.txt, 2.txt 3.txt and so on until 6000.txt. I want to count the "number of words" in only first 3000 of them. Any suggestions?
I know wc -w can count the number of words in a text file. I am using Red Hat Linux. (3 Replies)
Discussion started by: shoaibjameel123
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9. Shell Programming and Scripting
>cat data.dat
0001 Robbert
0002 Nick
0003 Mark
.......
1000 Jarek (3 Replies)
Discussion started by: McLan
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10. UNIX for Dummies Questions & Answers
Hello!
I'm trying to find out the total file size of a subset list in a directory. For example, I do not need to know the total file size of all the files in a directory, but I need to know what the total size is of say, "ls -l *FEB08*" in a directory. Is there any easy way of doing this?
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Discussion started by: tekster757
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SRAND(3) 1 SRAND(3)
srand - Seed the random number generator
SYNOPSIS
void srand ([int $seed])
DESCRIPTION
Seeds the random number generator with $seed or with a random value if no $seed is given.
Note
As of PHP 4.2.0, there is no need to seed the random number generator with srand(3) or mt_srand(3) as this is now done automati-
cally.
PARAMETERS
o $seed
- Optional seed value
RETURN VALUES
No value is returned.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 4.2.0 | |
| | |
| | The $seed becomes optional and defaults to a |
| | random value if omitted. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
srand(3) example
<?php
// seed with microseconds
function make_seed()
{
list($usec, $sec) = explode(' ', microtime());
return (float) $sec + ((float) $usec * 100000);
}
srand(make_seed());
$randval = rand();
?>
SEE ALSO
rand(3), getrandmax(3), mt_srand(3).
PHP Documentation Group SRAND(3)