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FS did not show after delete one field in awk

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# 1  
Old 01-28-2011
FS did not show after delete one field in awk
Hello,
I met a problem to delete one column out of 32, say column 13. I tried awk and gawk but neither worked. The problem is col13 can deleted but the field separator is gone too, so that the output is not in tab-delimited format. Or, col13 can't be deleted. I want the output file with TAB as field separator. Any clue is appreciated.

Here is my script:

Code:
awk 'BEGIN { FS = "\t" } { $13=""; print}' file.tab

#This one deleted col13, but the FS is gone too making the output messed up

Code:
gawk -FS"\t" '($13="")13' file.tab

# This did not work as column 13 is still there although TAB is right
I am using Ubuntu 10.04 (Lucid)

Here is the first three rows of my file to be trimmed
==============================================
Code:
Run    NewProbeID    ProbeName    TargetID    Accessions    Description    FEATURES    FeatureNum    Row    Col    SubTypeMask    ControlType    ProbeName    SystematicName    PositionX    PositionY    gProcessedSignal    gProcessedSigError    gMedianSignal    gBGMedianSignal    gBGPixSDev    gIsSaturated    gIsFeatNonUnifOL    gIsBGNonUnifOL    gIsFeatPopnOL    gIsBGPopnOL    IsManualFlag    gBGSubSignal    gIsPosAndSignif    gIsWellAboveBG    SpotExtentX    gBGMeanSignal
1    GS000001    GT_Specific_Arabidopsis-SS-AT1G01073.1|35|60    AT1G01073.1    AT1G01073.1    Next best hit: CTGSIN-CL5216Contig2 Identity: 100.00 Alignment Length: 16 Annotation:  unknown protein    DATA    134077    789    117    0    0    GT_Specific_Arabidopsis-SS-AT1G01073.1|35|60    Arabidopsis-AT1G01073.1    3041.22    5206.48    2.64E+00    2.67E+00    38    33    8.75E+00    0    0    0    0    0    0    2.41979    0    0    27.0811    33.7054
2    GS000002    GT_Specific_Arabidopsis-SS-AT1G01100.1|468|60    AT1G01100.1    AT1G01100.1    Next best hit: SUPCTG-SuperContig_CL125Contig1 Identity: 100.00 Alignment Length: 17 Annotation:  60S acidic ribosomal protein P1 (RPP1A)    DATA    128355    756    5    0    0    GT_Specific_Arabidopsis-SS-AT1G01100.1|468|60    Arabidopsis-AT1G01100.1    682    5003.5    2.64E+00    2.66E+00    34    36    1.00E+01    0    0    0    0    0    0    0.0056826    0    0    26.2212    35.5756

=========================================
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!
Last edited by vgersh99; 01-28-2011 at 05:43 PM.. Reason: code tags, please!
# 2  
Old 01-28-2011
Code:
awk 'BEGIN { FS=OFS="\t" } { $13=""; sub(FS FS FS "*",FS)}1' file.tab

This User Gave Thanks to vgersh99 For This Post:
yifangt
# 3  
Old 01-29-2011
Default FS has already included both space and tab.

Code:
gawk '{$13=""}1' OFS="\t" file.tab

# 4  
Old 01-29-2011
Quote:
Originally Posted by rdcwayx
Default FS has already included both space and tab.

Code:
gawk '{$13=""}1' OFS="\t" file.tab

Exactly- so having the embedded spaces in the tab separated fields will not fly.
Plus, the above will leave extra FS in place of the deleted field.
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