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sed awk: split a large file to unique file names

 
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Old 08-24-2016
sed awk: split a large file to unique file names
Dear Users,


Appreciate your help if you could help me with splitting a large file > 1 million lines with sed or awk. below is the text in the file
input file.txt
Code:
scaffold1       928     929     C/T     +
scaffold1       942     943     G/C     +
scaffold1       959     960     C/T     +
scaffold1       994     995     G/A     +
scaffold2       1024    1025    G/A     +
scaffold2       1065    1066    G/A     +
scaffold2       1356    1357    C/T     +
scaffold2       1363    1364    G/A     +
scaffold3       1367    1368    G/A     +
scaffold3       1403    1404    G/A     +
scaffold3       1404    1405    C/T     +
scaffold3       1433    1434    G/A     +
scaffold3       1467    1468    G/A     +
scaffold4       1521    1522    G/A     +
scaffold4       63885   63886   T/G     +
scaffold4       63907   63908   G/A     +
scaffold4       63942   63943   T/C     +
scaffold4       63964   63965   G/A     +
scaffold5       63996   63997   G/A     +
scaffold5       63997   63998   T/C     +
scaffold5       64074   64075   G/T     +
scaffold100       64076   64077   C/T     +
scaffold100       64127   64128   C/T     +
scaffold120       64221   64222   A/G     +
scaffold1100       64222   64223   T/C     +
scaffold1890       64263   64264   C/T     +
scaffold2000       64281   64282   G/C     +
scaffold2001       64292   64293   C/T     +
scaffold2002      64343   64344   G/A     +
scaffold2003       64347   64348   G/T     +

my output file should be unique to the first column name
output files
file1.txt
Code:
scaffold1       928     929     C/T     +
scaffold1       942     943     G/C     +
scaffold1       959     960     C/T     +
scaffold1       994     995     G/A     +

file2.txt
Code:
scaffold2       1024    1025    G/A     +
scaffold2       1065    1066    G/A     +
scaffold2       1356    1357    C/T     +
scaffold2       1363    1364    G/A     +

file2.txt
Code:
scaffold3       1367    1368    G/A     +
scaffold3       1403    1404    G/A     +
scaffold3       1404    1405    C/T     +
scaffold3       1433    1434    G/A     +
scaffold3       1467    1468    G/A     +

and so on.

Thank you,
kapr0001



Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!
Last edited by RudiC; 08-24-2016 at 04:13 PM.. Reason: Added CODE tags.
 
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