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06.24.2008 at 01:57AM PDT, ID: 23510252
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9.3

Text manipulation using multiple files

Asked by sunnycoder in Perl Programming Language, Scripting Languages, Shell Scripting

Tags:

I need a script that works as follows

Input is a continuous stream of records (not infinite but this is going to be very voluminous - in TBs). Each record consists of n fields - tab separated. n is not known in advance but all records will have same number of fields. This input is received on stdin

There are several files, file1, file2, file3 ... each file is composed of two columns, sort of key value pairs separated by a space

script executed as
./myscript column1 file1 column2 file2 ... columnk filek

For each input record script will
   - extract the value in column1, search for this value in file1. If value is found (it would be in col1 of file1) append the value in col2 of file1 to the current record. If not found, append a sentinnel string "UNKNOWN" without the quotes
   - extract the value in column2, search for this value in file2. If value is found (it would be in col1 of file2) append the value in col2 of file2 to the current record. If not found, append a sentinnel string "UNKNOWN" without the quotes
   ...
   - extract the value in columnk, search for this value in filek. If value is found (it would be in col1 of filek) append the value in col2 of filek to the current record. If not found, append a sentinnel string "UNKNOWN" without the quotes

e.g.

file1
Adam     25
Brain      32
Chris      22

file2
Brain     CS
Chris     SS

File3
Adam    NY
Brain     MN
Chris     IN

./myscript 1 File3 2 File2 1 File1

Input record
Adam     student     UCB
would output
Adam     student     UCB     NY     UNKNOWN     25

Can use a solution in Perl/awk/bash.

Thanks!!Start Free Trial
[+][-]06.24.2008 at 02:12AM PDT, ID: 21853645

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[+][-]06.24.2008 at 02:56AM PDT, ID: 21853846

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[+][-]06.24.2008 at 03:57AM PDT, ID: 21854260

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[+][-]06.24.2008 at 03:59AM PDT, ID: 21854273

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About this solution

Zones: Perl Programming Language, Scripting Languages, Shell Scripting
Tags: Perl
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Solution Provided By: ozo
Participating Experts: 1
Solution Grade: A
 
 
[+][-]06.24.2008 at 04:18AM PDT, ID: 21854372

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