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Full Discussion: Rearrange fields of delimited text file
Top Forums Shell Programming and Scripting Rearrange fields of delimited text file Post 303003162 by durden_tyler on Friday 8th of September 2017 08:23:51 AM
Old 09-08-2017
Quote:
Originally Posted by andy2000
@rdrtx1: your solution doesn't work with more than 2 rows Smilie

a_13;a_2;a_1;a_10
13;2;1;10
23,22,11,100

---------- Post updated at 05:13 AM ---------- Previous update was at 05:10 AM ----------

Sorry, all your solution doesn't work with more than 3 rows:

a_13;a_2;a_1;a_10
13;2;1;10
23,22,11,100
...

Smilie
That's because you changed your delimiter character from ";" to "," (semi-colon to comma) in the last line of your data file.

If I keep the delimiter consistent for all the rows i.e. ";", then it does work:

Code:
$
$ cat data.txt
a_13;a_2;a_1;a_10
13;2;1;10
23,22,11,100
$
$ # Will not work because the last line cannot be split (as per the program's intention) on comma ","
$ perl -F';' -lane 'if ($. == 1){
                        %x = map{ $F[$_] => $_ } (0..$#F);
                        @s = map{ $x{$_} } sort { (split "_", $a)[1] <=> (split "_", $b)[1] } @F;
                    }
                    print join ";", map{ $F[$s[$_]] }(0..$#F);
                   ' data.txt
a_1;a_2;a_10;a_13
1;2;10;13
 
$
$ # After changing data.txt
$
$ cat data.txt
a_13;a_2;a_1;a_10
13;2;1;10
23;22;11;100
$
$ # Will work now because the delimiter is consistent for all rows
$
$ perl -F';' -lane 'if ($. == 1){
                        %x = map{ $F[$_] => $_ } (0..$#F);
                        @s = map{ $x{$_} } sort { (split "_", $a)[1] <=> (split "_", $b)[1] } @F;
                    }
                    print join ";", map{ $F[$s[$_]] }(0..$#F);
                   ' data.txt
a_1;a_2;a_10;a_13
1;2;10;13
11;22;100;23
$
$

Last edited by durden_tyler; 09-08-2017 at 09:38 AM..
 

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LEARN ABOUT REDHAT

split

SPLIT(1)								FSF								  SPLIT(1)

NAME

       split - split a file into pieces

SYNOPSIS

       split [OPTION] [INPUT [PREFIX]]

DESCRIPTION

       Output  fixed-size  pieces  of  INPUT  to PREFIXaa, PREFIXab, ...; default PREFIX is `x'.  With no INPUT, or when INPUT is -, read standard
       input.

       Mandatory arguments to long options are mandatory for short options too.

       -a, --suffix-length=N
	      use suffixes of length N (default 2)

       -b, --bytes=SIZE
	      put SIZE bytes per output file

       -C, --line-bytes=SIZE
	      put at most SIZE bytes of lines per output file

       -l, --lines=NUMBER
	      put NUMBER lines per output file

       --verbose
	      print a diagnostic to standard error just before each output file is opened

       --help display this help and exit

       --version
	      output version information and exit

       SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg.

AUTHOR

       Written by Torbjorn Granlund and Richard M. Stallman.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full  documentation  for split is maintained as a Texinfo manual.  If the info and split programs are properly installed at your site,
       the command

	      info split

       should give you access to the complete manual.

split (coreutils) 4.5.3 					   February 2003							  SPLIT(1)
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