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awk to add symbol to specific field

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# 1  
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
# 2  
Old 11-17-2016
Hello cmccabe,

I am pretty sure it's happening because of your Input_file is not having all the fields as TAB delimited, when you make all fields tab delimited it will not misplace it.

Thanks,
R. Singh
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