08-03-2011
"-k2 -k1" means:
first, compare values from second field to the end of line
second, if values are equal in the first comparison, then compare from the first field to the end of line
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0000001
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hi all,
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Hi Guys ,
Please help me I am having a requirement as below:
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66486532 log1
66486662 log10
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66486664 log12
66486665 log13
66486533 log2
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Hi Everyone,
# cat b
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 11:32:49 AM MYT;
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;
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these are two records(adr.txt)trying to sort with the the code expl below.
5423|336110|2730 Pierce St|Ste 300|Sioux City|IA|Woodbury|51104|3765||42518651|96405013|A|2|3|U|12/08/2009
5423|14462335|624 JONES ST|STE 5400|Sioux City|IA|Woodbury|51101|||42496648|96400644|A|8|2|U |12/24/2009
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I want to sort unique values of column 2 that has the maximum value at column 7. this is my file and desired output
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AD008 AD0081010180947 101018 0947 0950 1010180947 1010180950
AD008 AD0081010180947 101018 0947 0956 1010180947 1010180956
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qsort(3) Library Functions Manual qsort(3)
NAME
qsort - Sorts a table in place
LIBRARY
Standard C Library (libc.so, libc.a)
SYNOPSIS
#include <stdlib.h>
void qsort(
void *base,
size_t nmemb,
size_t size,
int (*compar) (const void *, const void *));
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
qsort(): XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
PARAMETERS
Points to the first entry in the table. Specifies the number of entries in the table. Specifies the size in bytes of each table entry.
Points to the user-specified function to be used to compare pairs of table elements. The comparison function will be called with two
parameters that point to the two elements to be compared. The comparison function must return an integer less than, equal to, or greater
than zero, depending on whether the first element in the comparison is considered less than, equal to, or greater than the second element.
DESCRIPTION
The qsort() function sorts a table having a specified number of entries. The contents of the table are sorted in ascending order according
to a user-specified comparison function (the strcmp() function, for example).
NOTES
The comparison function need not compare every byte, so arbitrary data may be contained in the elements in addition to the values being
compared.
When two members compare equal, their order in the sorted array is indeterminate.
RELATED INFORMATION
Functions: bsearch(3), lsearch(3)
Standards: standards(5) delim off
qsort(3)