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Top Forums Shell Programming and Scripting How to search and replace string from nth column from a file? Post 302960039 by Amit Joshi on Monday 9th of November 2015 11:53:40 PM
Old 11-10-2015
How to search and replace string from nth column from a file?

I wanted to search for a string and replace it with other string from nth column of a file which is comma seperated which I am able to do with below

# For Comma seperated file without quotes
Code:
 awk 'BEGIN{OFS=FS=","}$"'"$ColumnNo"'"=="'"$PPK"'"{$"'"$ColumnNo"'"="'"$NPK"'"}{print}' ${FileName}

# For Comma seperated file with quotes
Code:
awk 'BEGIN{OFS=FS=","}$"'"$ColumnNo"'"=="\""'"$PPK"'"\""{$"'"$ColumnNo"'"="\""'"$NPK"'"\""}{print}' ${FileName}

But I wanted to make it in one command so that it works for both type of file. I know I can do with sed command sed -i "s/$PPK/$NPK/" $FileName but it replaces the value in other columns as well so can anyone suggest what can be done ?

Here ColumnNo is the nth column from which I wanted to replace PPK to NPK.

Please find other details
Code:
 uname -a
Linux XXXXXXX 2.6.32-220.25.1.el6.x86_64 #1 SMP Tue Aug 14 13:14:38 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux
echo $SHELL
/bin/ksh
echo $KSH_VERSION
Version JM 93t+ 2010-06-21


Last edited by Amit Joshi; 11-10-2015 at 12:59 AM.. Reason: Added more details
 

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FANN_READ_TRAIN_FROM_FILE(3)						 1					      FANN_READ_TRAIN_FROM_FILE(3)

fann_read_train_from_file - Reads a file that stores training data

SYNOPSIS
resource fann_read_train_from_file (string $filename) DESCRIPTION
Reads a file that stores training data. PARAMETERS
o $filename - The input file in the following format: num_train_data num_input num_output inputdata seperated by space outputdata seperated by space inputdata seperated by space outputdata seperated by space RETURN VALUES
Returns a train data resource on success, or FALSE on error. EXAMPLES
Example #1 fann_read_train_from_file example <?php $train_data = fann_read_train_from_file("xor.data"); if ($train_data) { // Do something with $train_data for XOR function } ?> Contents of xor.data 4 2 1 -1 -1 -1 -1 1 1 1 -1 1 1 1 -1 SEE ALSO
fann_train_on_data(3), fann_destroy_train(3), fann_save_train(3). PHP Documentation Group FANN_READ_TRAIN_FROM_FILE(3)
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