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Full Discussion: How to extract every 6-th character in a line?
Top Forums Shell Programming and Scripting How to extract every 6-th character in a line? Post 303026414 by stomp on Tuesday 27th of November 2018 10:51:05 AM
Old 11-27-2018
Just to dump my lines here before I clean it from my disk ....

This is in bash:

Code:
#!/bin/bash

compact() {
        local compacted=""
        local length=${#1}
        for((char=0;$char<=$length;char=$char+7)) ; do
                compacted="$compacted${1:$char:1}"
        done
        _res=$compacted
}

while read line ;do 
        compact "${line:7}"
        printf "%6s %s\n" ${line:0:6} $_res
done <$1

3 seconds per processed line (~21 Hours total)

same in lua:

Code:
#!/usr/bin/env lua

local data = io.open(arg[1],"r")

function compact(string)
        local compacted=""
        local length = string:len()
        for char=1,length,7 do
                compacted=compacted..string:sub(char,char)
        end
        return compacted
end

for line in data:lines() do
      print(line:sub(1,7)..compact(line:sub(8)))
end

2 minutes runtime total
 

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LEARN ABOUT ULTRIX

ccat

compact(1)						      General Commands Manual							compact(1)

Name
       compact, uncompact, ccat - compress and uncompress files, and cat them

Syntax
       compact [name...]
       uncompact [name...]
       ccat [file...]

Description
       The  command compresses the named files using an adaptive Huffman code.	If no file names are given, the standard input is compacted to the
       standard output.  The command operates as an on-line algorithm.	Each time a byte is read, it is encoded immediately according to the  cur-
       rent  prefix  code.   This code is an optimal Huffman code for the set of frequencies seen so far.  It is unnecessary to prepend a decoding
       tree to the compressed file since the encoder and the decoder start in the same state and stay synchronized.  Furthermore, and can  operate
       as filters.  In particular,
	    ... | compact | uncompact | ...
       operates as a (very slow) no-op.

       When  an  argument file is given, it is compacted and the resulting file is placed in file.C; file is unlinked.	The first two bytes of the
       compacted file code the fact that the file is compacted.  This code is used to prohibit recompaction.

       The amount of compression to be expected depends on the type of file being compressed.  Typical values of compression are: Text (38%), Pas-
       cal Source (43%), C Source (36%) and Binary (19%).  These values are the percentages of file bytes reduced.

       The command restores the original file from a file compressed by If no file names are given, the standard input is uncompacted to the stan-
       dard output.

       The command cats the original file from a file compressed by without uncompressing the file.

       The command is present only for compatibility.  In general, the command runs faster and gives better compression.

Restrictions
       The last segment of the file name must contain fewer than thirteen characters to allow space for the appended '.C'.

Files
       compacted file created by compact, removed by uncompact

See Also
       compress(1)

																	compact(1)
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