sed awk: split a large file to unique file names Post: 302980134

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Top Forums UNIX for Beginners Questions & Answers sed awk: split a large file to unique file names Post 302980134 by RavinderSingh13 on Wednesday 24th of August 2016 11:20:15 AM

08-24-2016

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Hello Kapr0001,

Welcome to forums, hope you will enjoy learning/sharing knowledge here. Please use code tags for your commands/codes/Inputs which you are using into your post as per forum rules. Following may help you in same.
Let's say we have following Input_file.

Code:

cat Input_file
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 +

Then following is the code.

Code:

awk '{Q=$0;sub(/[[:alpha:]]+/,X,$1);A[$1]=A[$1]?A[$1] ORS Q:Q;num=num>$1?num:$1} END{for(i=1;i<=num;i++){print A[i] > "file"i".txt";close("file"i".txt")}}'  Input_file

Output will be 5 files named file1.txt,file2.txt,file3.txt,file4.txt and file5.txt as follows.

Code:

cat file1.txt
scaffold1 928 929 C/T +
scaffold1 942 943 G/C +
scaffold1 959 960 C/T +
scaffold1 994 995 G/A +
  
cat file2.txt
scaffold2 1024 1025 G/A +
scaffold2 1065 1066 G/A +
scaffold2 1356 1357 C/T +
scaffold2 1363 1364 G/A +

cat file3.txt
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 +

cat file4.txt
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 +
  
cat file5.txt
scaffold5 63996 63997 G/A +
scaffold5 63997 63998 T/C +
scaffold5 64074 64075 G/T +

Please do let us know if this helps you. Enjoy learning

NOTE: Also wanted to mention here, above code considered that you 1st field have a digit in it, so by which I am only taking maximum number and then going further in it.

Thanks,
R. Singh

Last edited by RavinderSingh13; 08-24-2016 at 12:23 PM.. Reason: Added a NOTE to solution now.

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