03-15-2009
Using grep on a range of numbers
Hi im new to unix and need to find a way to grep the top 5 numbers in a file and put them into another file. For example my file looks like this
abcdef 50000
abcdef 45000
abcdef 40000
abcdef 35000
abcdef 30000
abcdef 25000
abcdef 20000
abcdef 15000
abcdef 10000
and so on...
How can i grep the top 5 of these and put them into a seperate file i know you can use range on characters but is there a way to do it on more then 1 character maybe.
Any help appreciated thanks so much!!
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STRSPN(3) 1 STRSPN(3)
strspn - Finds the length of the initial segment of a string consisting entirely of characters contained within a given mask.
SYNOPSIS
int strspn (string $subject, string $mask, [int $start], [int $length])
DESCRIPTION
Finds the length of the initial segment of $subject that contains only characters from $mask.
If $start and $length are omitted, then all of $subject will be examined. If they are included, then the effect will be the same as call-
ing strspn(substr($subject, $start, $length), $mask) (see "substr" for more information).
The line of code:
<?php
$var = strspn("42 is the answer to the 128th question.", "1234567890");
?>
2 to $var, because the string "42" is the initial segment of $subject that consists only of characters contained within "1234567890".
PARAMETERS
o $subject
- The string to examine.
o $mask
- The list of allowable characters.
o $start
- The position in $subject to start searching. If $start is given and is non-negative, then strspn(3) will begin examining $sub-
ject at the $start'th position. For instance, in the string ' abcdef', the character at position 0 is ' a', the character at posi-
tion 2 is ' c', and so forth. If $start is given and is negative, then strspn(3) will begin examining $subject at the $start'th
position from the end of $subject.
o $length
- The length of the segment from $subject to examine. If $length is given and is non-negative, then $subject will be examined for
$length characters after the starting position. If $length is given and is negative, then $subject will be examined from the
starting position up to $length characters from the end of $subject.
RETURN VALUES
Returns the length of the initial segment of $subject which consists entirely of characters in $mask.
EXAMPLES
Example #1
strspn(3) example
<?php
// subject does not start with any characters from mask
var_dump(strspn("foo", "o"));
// examine two characters from subject starting at offset 1
var_dump(strspn("foo", "o", 1, 2));
// examine one character from subject starting at offset 1
var_dump(strspn("foo", "o", 1, 1));
?>
The above example will output:
int(0)
int(2)
int(1)
NOTES
Note
This function is binary-safe.
SEE ALSO
strcspn(3).
PHP Documentation Group STRSPN(3)