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How to remove duplicated column in a text file?

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# 1  
Old 01-14-2015
How to remove duplicated column in a text file?
Dear all,

How can I remove duplicated column in a text file?

Input:
Code:
LG10_PM_map_19_LEnd	1000560	G	AA	AA	AA	AA	AA	GG
LG10_PM_map_19_LEnd	1005621	G	GG	GG	GG	AA	AA	GG
LG10_PM_map_19_LEnd	1011214	A	AA	AA	AA	AA	GG	GG
LG10_PM_map_19_LEnd	1011673	T	TT	TT	TT	TT	CC	CC
LG10_PM_map_19_LEnd	1088961	C	TT	TT	TT	TT	TT	TT
LG10_PM_map_19_LEnd	1089024	G	AA	AA	AA	AA	AA	AA
LG10_PM_map_19_LEnd	1108301	C	TT	TT	TT	TT	TT	CC
LG10_PM_map_19_LEnd	11365128	G	AA					
LG10_PM_map_19_LEnd	11365170	T	CC					
LG10_PM_map_19_LEnd	11381744	A	GG	GG	GG	GG	GG	GG
LG10_PM_map_19_LEnd	11381772	T	TT	TT				
LG10_PM_map_19_LEnd	11385851	A	AA	AA	AA	AA	AA	AA
LG10_PM_map_19_LEnd	11386265	A	AA	AA	AA	AA	AA	AA
LG10_PM_map_19_LEnd	1138663	T	AA	TT	AA	AA	TT	TT

Output:
Code:
LG10_PM_map_19_LEnd	1000560	G	AA	GG
LG10_PM_map_19_LEnd	1005621	G	GG	AA
LG10_PM_map_19_LEnd	1011214	A	AA	GG
LG10_PM_map_19_LEnd	1011673	T	TT	CC
LG10_PM_map_19_LEnd	1088961	C	TT
LG10_PM_map_19_LEnd	1089024	G	AA
LG10_PM_map_19_LEnd	1108301	C	TT	CC
LG10_PM_map_19_LEnd	11365128	G	AA			
LG10_PM_map_19_LEnd	11365170	T	CC
LG10_PM_map_19_LEnd	11381744	A	GG
LG10_PM_map_19_LEnd	11381772	T	TT			
LG10_PM_map_19_LEnd	11385851	A	AA
LG10_PM_map_19_LEnd	11386265	A	AA
LG10_PM_map_19_LEnd	1138663	T	AA	TT

---------- Post updated at 02:27 AM ---------- Previous update was at 01:24 AM ----------

Hi all,

I figured out with awk:

Code:
awk '{ while(++i<=NF) printf (!a[$i]++) ? $i FS : ""; i=split("",a); print ""}' input > output

# 2  
Old 01-14-2015
More common practice for processing the fields is a for loop.
The following does not print a trailing space.
Code:
awk '{ for (i=1;i<=NF;i++) {if (!a[$i]++) printf d $i; d=FS}; d=""; split("",a); print "" }' input

A % in the input would confuse printf. More robust is
Code:
awk '{ for (i=1;i<=NF;i++) {if (!a[$i]++) printf "%s",d $i; d=FS}; d=""; split("",a); print "" }' input

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