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Full Discussion: Removing a character at specific position in a column
Operating Systems Linux Removing a character at specific position in a column Post 302957563 by RavinderSingh13 on Tuesday 13th of October 2015 01:16:17 AM
Old 10-13-2015
Hello Syeda,

Following may help you in same, let's say you have a Input_file as follows(which is an example as you haven't shown us complete input and didn't tell us about field separator so I am taking it as a test, where field separator is a space and which has 7 columns in it.)
Input_file:
Code:
cat Input_file
Ravinder gi_49482297_ref_YP_039521.1_ TESTing test123 sixth_column_ seventh eight_column_test
TEST121 gi_49482297_ref_YP_039521.1_ TESTing test123 sixth_column_ seventh eight_column_test
TEST1211 gi_49482315_ref_YP_039539.1_ TESTing test123 sixth_column_ seventh eight_column_test
TEST12134 gi_49482315_ref_YP_039539.1_ TESTing test123 sixth_column_ seventh eight_column_test

Now following code may help in same.
Code:
awk '{for(i=1;i<=NF;i++){if(i==2){sub(/\_$/,X,$i)} else {sub(/\_$/,"_new charachter",$i)};}} 1'  Input_file

Output will be as follows.
Code:
Ravinder gi_49482297_ref_YP_039521.1 TESTing test123 sixth_column_new charachter seventh eight_column_test
TEST121 gi_49482297_ref_YP_039521.1 TESTing test123 sixth_column_new charachter seventh eight_column_test
TEST1211 gi_49482315_ref_YP_039539.1 TESTing test123 sixth_column_new charachter seventh eight_column_test
TEST12134 gi_49482315_ref_YP_039539.1 TESTing test123 sixth_column_new charachter seventh eight_column_test

Where I am changing 2nd columns _ with NULL and other columns (only 5th column in my example file) _ with a string _new charachter which you can put it as per your requirement into code. Let us know if this helps you.


Thanks,
R. Singh
Last edited by RavinderSingh13; 10-13-2015 at 02:23 AM..
This User Gave Thanks to RavinderSingh13 For This Post:
Syeda Sumayya
 

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LEARN ABOUT SUSE

column

COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME

     column -- columnate lists

SYNOPSIS

     column [-tx] [-c columns] [-s sep] [file ...]

DESCRIPTION

     The column utility formats its input into multiple columns.  Rows are filled before columns.  Input is taken from file operands, or, by
     default, from the standard input.	Empty lines are ignored.

     The options are as follows:

     -c      Output is formatted for a display columns wide.

     -s      Specify a set of characters to be used to delimit columns for the -t option.

     -t      Determine the number of columns the input contains and create a table.  Columns are delimited with whitespace, by default, or with
	     the characters supplied using the -s option.  Useful for pretty-printing displays.

     -x      Fill columns before filling rows.

     Column exits 0 on success, >0 if an error occurred.

ENVIRONMENT

     COLUMNS  The environment variable COLUMNS is used to determine the size of the screen if no other information is available.

EXAMPLES

	   (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY HH:MM/YEAR NAME
" 
	   ; ls -l | sed 1d) | column -t

SEE ALSO

     colrm(1), ls(1), paste(1), sort(1)

HISTORY

     The column command appeared in 4.3BSD-Reno.

AVAILABILITY

     The column command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

BSD
								   June 6, 1993 							       BSD
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