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Top Forums Shell Programming and Scripting awk to add symbol to specific field Post 302985959 by cmccabe on Thursday 17th of November 2016 10:52:17 AM
Old 11-17-2016
awk to add symbol to specific field

Trying to use awk to add a . to $4. The input and output is tab-delimeted, but the awk seems to add a . in front of $5 and is space-delimeted. It seems close, but I am not able to produce the desired output. Thank you Smilie.

file
Code:
chr1    948895    949015    chr1:948895-949015     ISG15
chr1    949311    949431    chr1:949311-949431     ISG15
chr1    949431    949551    chr1:949431-949551     ISG15

awk with current output
Code:
awk -F'\t' -v OFS='\t' '{$5="."$5;print $0}' file
chr1    948895    949015    chr1:948895-949015    . ISG15
chr1    949311    949431    chr1:949311-949431    . ISG15
chr1    949431    949551    chr1:949431-949551    . ISG15

desired output
Code:
chr1    948895    949015    chr1:948895-949015     .     ISG15
chr1    949311    949431    chr1:949311-949431     .     ISG15
chr1    949431    949551    chr1:949431-949551     .     ISG15

Maybe not the best, but seems to work:
Code:
awk -F'\t' -v OFS='\t' '{print $1, $2, $3 ,".", $4, $5}' file


Last edited by cmccabe; 11-17-2016 at 12:34 PM.. Reason: add possible solution
 

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JOIN(1) 						      General Commands Manual							   JOIN(1)

NAME
join - relational database operator SYNOPSIS
join [ options ] file1 file2 DESCRIPTION
Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2. If file1 is `-', the standard input is used. File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the first in each line. There is one line in the output for each pair of lines in file1 and file2 that have identical join fields. The output line normally con- sists of the common field, then the rest of the line from file1, then the rest of the line from file2. Fields are normally separated by blank, tab or newline. In this case, multiple separators count as one, and leading separators are dis- carded. These options are recognized: -an In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2. -e s Replace empty output fields by string s. -jn m Join on the mth field of file n. If n is missing, use the mth field in each file. -o list Each output line comprises the fields specifed in list, each element of which has the form n.m, where n is a file number and m is a field number. -tc Use character c as a separator (tab character). Every appearance of c in a line is significant. SEE ALSO
sort(1), comm(1), awk(1) BUGS
With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort. The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous. JOIN(1)
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