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Full Discussion: sed awk: split a large file to unique file names
Top Forums UNIX for Beginners Questions & Answers sed awk: split a large file to unique file names Post 302980139 by Akshay Hegde on Wednesday 24th of August 2016 12:09:05 PM
Old 08-24-2016
If input file is not sorted then try this
Code:
[akshay@localhost tmp]$ awk '!($1 in a){a[$1]="file"++c".txt"}{print $0 >>a[$1]; close(a[$1])}' file

If input file is sorted then try this
Code:
[akshay@localhost tmp]$ awk '$1 != prev{if(f)close(f);f="file"++c".txt"; prev=$1}{print > f}END{if(f)close(f)}' file


Quote:
Originally Posted by kapr0001
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
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
scaffold1 928 929 C/T +
scaffold1 942 943 G/C +
scaffold1 959 960 C/T +
scaffold1 994 995 G/A +
file2.txt
scaffold2 1024 1025 G/A +
scaffold2 1065 1066 G/A +
scaffold2 1356 1357 C/T +
scaffold2 1363 1364 G/A +
file2.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 +

and so on.

Thank you,
kapr0001
 

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LEARN ABOUT REDHAT

unix2dos

unix2dos(1)						      General Commands Manual						       unix2dos(1)

NAME

       unix2dos - UNIX to DOS text file format converter

SYNOPSYS

       unix2dos [options] [-c convmode] [-o file ...] [-n infile outfile ...]

       Options:

       [-hkqV] [--help] [--keepdate] [--quiet] [--version]

DESCRIPTION

       This manual page documents unix2dos, the program that converts text files in UNIX format to DOS format.

OPTIONS

       The following options are available:

       -h --help
	      Print online help.

       -k --keepdate
	      Keep the date stamp of output file same as input file.

       -q --quiet
	      Quiet mode. Suppress all warning and messages.

       -V --version
	      Prints version information.

       -c --convmode convmode
	      Sets conversion mode. Simulates unix2dos under SunOS.

       -o --oldfile file ...
	      Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used.

       -n --newfile infile outfile ...
	      New  file  mode.	Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be
	      used or you WILL lost your files.

EXAMPLES

       Get input from stdin and write output to stdout.

	      unix2dos

       Convert and replace a.txt. Convert and replace b.txt.

	      unix2dos a.txt b.txt

	      unix2dos -o a.txt b.txt

       Convert and replace a.txt in ASCII conversion mode.  Convert and replace b.txt in ISO conversion mode.

	      unix2dos a.txt -c iso b.txt

	      unix2dos -c ascii a.txt -c iso b.txt

       Convert and replace a.txt while keeping original date stamp.

	      unix2dos -k a.txt

	      unix2dos -k -o a.txt

       Convert a.txt and write to e.txt.

	      unix2dos -n a.txt e.txt

       Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt.

	      unix2dos -k -n a.txt e.txt

       Convert and replace a.txt. Convert b.txt and write to e.txt.

	      unix2dos a.txt -n b.txt e.txt

	      unix2dos -o a.txt -n b.txt e.txt

       Convert c.txt and write to e.txt. Convert and replace a.txt.  Convert and replace b.txt. Convert d.txt and write to f.txt.

	      unix2dos -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt

DIAGNOSTICS

BUGS

       The program does not work properly under MSDOS in stdio processing mode.  If you know why is that so, please tell me.

AUTHOR

       Benjamin Lin - ( blin@socs.uts.edu.au )

MISCELLANY

       Tested environment:

	      Linux 1.2.0 with GNU C 2.5.8

	      SunOS 4.1.3 with GNU C 2.6.3

	      MS-DOS 6.20 with Borland C++ 4.02

       Suggestions and bug reports are welcome.

SEE ALSO

       dos2unix(1)

1995.03.31							   unix2dos v2.2						       unix2dos(1)
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