Awk: Performing "for" loop within text block with two files Post: 303029183

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Top Forums UNIX for Beginners Questions & Answers Awk: Performing "for" loop within text block with two files Post 303029183 by Scrutinizer on Tuesday 22nd of January 2019 11:09:45 PM

01-23-2019

Moderator

You are welcome jvoot.

Don is right of course and it all depends what it is that you require.

To illustrate, to add the additional requirements, you could try these adjustments, which makes the code more precise, but more complex.

Code:

awk '
  NR==FNR {
    Keys[$1,$2]
    next
  }
  /<Co>/ { 
    for(line=1; line<=NF; line++) {
      split($line,Fields," ")
      if(line==1)
        subkey1=Fields[1]
      if(Fields[1]=="Lexeme") {
        for(i in Fields)
          if((subkey1,Fields[i]) in Keys) {
            print
            next
          }
        }
      }
    }
' file1 FS='\n' RS= ORS='\n\n' file2

How much precision you need depends on the variability of your input files. So to understand the limitations, you need to understand both your data and your code and you need to test of course.

This approach uses RS=, which is a special case, where an empty line (two consecutive newlines) is used as a record separator. The additional requirements, meant that the field separator FS needed to be changed to a newline, so that each field constitutes a line within a record in file2. These lines then needed to be split into smaller subfields using the split() command.

Each approach has its pros and cons.

A pro of this approach may be that the code can be simpler, so it may be easier to understand.

The cons are:

Adding more precision can sometimes lead to more complexity than a line based approach.
If there is so much as a space or TAB character on any of the empty lines, then it may break the solution..

You need to weigh these considerations when choosing your approach. It all depends..

Last edited by Scrutinizer; 01-23-2019 at 12:42 AM..

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LEARN ABOUT LINUX

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
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       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
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       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)

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