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Full Discussion: Grouping matches by cols
Top Forums Shell Programming and Scripting Grouping matches by cols Post 302234461 by gbalsu on Tuesday 9th of September 2008 06:50:03 PM
Old 09-09-2008
Grouping matches by cols

Dear all
I have a large file w. ~ 10 million lines.
The first two cols have matching partners.
For example:
A A
A B
B B

or

A A
B A
B B

The matches may be separated by an unknown number of lines.

My intention is to group them and add a "group" value in the last col.

For example

A A A
A B A
B B A

or

A A A
B A A
B B A

Rest assured that only one of A B and B A will be present and not both.
Any help will be highly appreciated.
A may have matches in addition to B and any number of of them. But in all cases I would like to name the group with the first partner of the first instance, i.e. A in this case.
Any help will be highly appreciated.
 

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GETGRNAM(3)						     Linux Programmer's Manual						       GETGRNAM(3)

NAME
getgrnam, getgrgid - get group file entry SYNOPSIS
#include <grp.h> #include <sys/types.h> struct group *getgrnam(const char *name); struct group *getgrgid(gid_t gid); DESCRIPTION
The getgrnam() function returns a pointer to a structure containing the group information from /etc/group for the entry that matches the group name name. The getgrgid() function returns a pointer to a structure containing the group information from /etc/group for the entry that matches the group gid gid. The group structure is defined in <grp.h> as follows: struct group { char *gr_name; /* group name */ char *gr_passwd; /* group password */ gid_t gr_gid; /* group id */ char **gr_mem; /* group members */ }; RETURN VALUE
The getgrnam() and getgrgid() functions return the group information structure, or NULL if the matching entry is not found or an error occurs. ERRORS
ENOMEM Insufficient memory to allocate group information structure. FILES
/etc/group Group database file CONFORMING TO
SVID 3, POSIX, BSD 4.3 SEE ALSO
fgetgrent(3), getgrent(3), setgrent(3), endgrent(3) GNU
1993-04-04 GETGRNAM(3)
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