02-27-2017
How to identify varying unique fields values from a text file in UNIX?
Hi,
I have a huge unsorted text file. We wanted to identify the unique field values in a line and consider those fields as a primary key for a table in upstream system.
Basically, the process or script should fetch the values from each line that are unique compared to the rest of the lines in the file.
If there are 150 bytes in a line for a file that is containing around 100,000 lines and I wanted to find how many bytes on the line (150 bytes) can be formed as a primary key?
I know the file has to be sorted based on the entire 150 bytes and aftre that I am not sure how can I identify the uniqueness between lines?
Please help.
Thanks,
Mani A
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LEARN ABOUT DEBIAN
setmaillist
setmaillist(1) General Commands Manual setmaillist(1)
NAME
setmaillist - create a binary mailing list
SYNOPSIS
setmaillist bin tmp
DESCRIPTION
setmaillist reads a mailing list from its standard input.
setmaillist writes the mailing list in a binary format to tmp; it then moves tmp to bin. tmp and bin must be on the same filesystem.
If there is a problem creating tmp, setmaillist complains and leaves bin alone.
The binary mailing list format is portable across machines.
setmaillist always creates bin world-readable.
MAILING LIST FORMAT
The mailing list read by setmaillist is a series of lines. NUL bytes are not allowed.
If a line begins with a dot or slash, setmaillist takes the entire line as an include file name.
If a line begins with an ampersand, setmaillist takes the rest of the line as a recipient address. If a line begins with a letter or num-
ber, setmaillist takes the entire line as a recipient address. Each recipient address must include a fully qualified domain name. Recipi-
ent addresses longer than 800 bytes are not allowed.
setmaillist ignores blank lines and lines beginning with #. It also ignores spaces and tabs at the ends of lines.
For example,
god@heaven.af.mil
djb@silverton.berkeley.edu
is a mailing list with two addresses.
SEE ALSO
setforward(1), newinclude(1), printmaillist(1)
setmaillist(1)