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Full Discussion: Shell script to Split matrix file with delimiter into multiple files
Top Forums UNIX for Beginners Questions & Answers Shell script to Split matrix file with delimiter into multiple files Post 303042222 by RudiC on Thursday 19th of December 2019 06:23:02 AM
Old 12-19-2019
This should work for exactly the data sample you presented; for "thousands of columns", additional efforts need to be spent, like closing output files after appending to them:


Code:
awk -F\; '
NR == 1 {for (i=5; i<=NF; i++)  {split ($i, T, "_")
                                 COL[T[1]] = COL[T[1]] OFS  i 
                                }
        }

        {for (c in COL) {n = split (COL[c], T)
                         OUT = $(T[2])
                         for (i=3; i<=n; i++) OUT = sprintf ("%s;%s", OUT, $(T[i]))
                         print $1, $2, $3, $4, OUT  >  (c ".txt")
                        }
        }
' OFS=\; file
---------- A.txt: ----------

ID1;ID2;ID3;ID4;A_1;A_2;A_3
AA;ax;ay;az;01;04;07
BB;bx;by;bz;03;44;27

---------- B.txt: ----------

ID1;ID2;ID3;ID4;B_1;B_2;B_3
AA;ax;ay;az;02;05;08
BB;bx;by;bz;05;15;08

---------- C.txt: ----------

ID1;ID2;ID3;ID4;C_1;C_2;C_3
AA;ax;ay;az;03;06;09
BB;bx;by;bz;33;26;09

 

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)
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