09-09-2008
Quote:
Originally Posted by
gbalsu
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
How do you determine the group value? Why is the third line not B B B?
Quote:
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.
It would be helpful if you provided more examples from the file.
It might also help if you posted some real data in addition to the abbreviated, single-letter data.
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pwget(1) General Commands Manual pwget(1)
NAME
pwget, grget - get password and group information
SYNOPSIS
name | uid]
name | gid]
DESCRIPTION
and locate and display information from and
The standard output of contains lines of colon-separated password information whose format is the same as that used in the file (see
passwd(4)).
The standard output of contains lines of colon-separated group information whose format is the same as that used in the file (see
group(4)).
With no options, and get all entries with or respectively, (see getpwent(3C) and getgrent(3C)), and output a line for each entry found.
Options
When an option is given, only a single entry is printed.
The options for are:
Output the first entry that matches
name using (see getpwent(3C)).
Output the first entry that matches
uid using (see getpwent(3C)).
The options for are:
Output the first entry that matches
name using (see getgrent(3C)).
Output the first entry that matches
gid using (see getgrent(3C)).
NETWORKING FEATURES
NFS
If Network Information System (NIS) is in use, these commands provide password and group information based on the NIS version of the pass-
word and group databases in addition to the local password and group files.
RETURN VALUE
These commands return upon success, when a specific search fails, and upon error.
DEPENDENCIES
NFS:
WARNING: If the Network Information System network database is in use and the NIS client daemon is not bound to a NIS server daemon (see
ypserv(1M)), these utilities will wait until such a binding is established. These commands can be terminated in this condition by sending
a signal to the process (see kill(1)).
See ypmatch(1), and ypserv(1M).
AUTHOR
and were developed by HP.
FILES
local group data file
local password data file
SEE ALSO
getgrent(3C), getpwent(3C), group(4), passwd(4).
pwget(1)