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Full Discussion: Make change to variable value inside of awk script
Top Forums Shell Programming and Scripting Make change to variable value inside of awk script Post 303012614 by LMHmedchem on Tuesday 6th of February 2018 07:31:00 PM
Old 02-06-2018
Thanks, that worked well.

This is the revised code,
Code:
# name field tag to look for
name_field='<name>'
# value to add to beginning of name string
pre='ID_'
awk -v find_name=$name_field -v pre=$pre ' { OUT[++CNT] = $0 }
                                      F==1 { gsub(" ", "_"); NAME = pre$0; F = 0 }
                            $0 ~ find_name { F = 1 }
                              $0 == "$$$$" { print NAME; for(i=2; i<=CNT; i++) print OUT[i]; delete OUT; CNT = 0 }
                                         ' > $output_file_name

It's nice to know how to do that as I'm sure it won't be the last time it comes up. Is gsub() part of awk or a call to a different tool?

Quote:
Originally Posted by MadeInGermany
Because the gsub() runs on $0 here (no 3rd argument --> $0), you can alter the other output as well, by placing the { OUT[++CNT] = $0 } after it.
Thanks for the tip, in this case, the name line is the only one that I need to modify.

---------- Post updated at 07:31 PM ---------- Previous update was at 05:07 PM ----------

Perhaps I spoke too soon about not needing to make space replacements in other places in the code. What I need to do is use the space replaced version of NAME on the first line as the original code does, and also use it for the line following the <name> tag.

I was thinking something like this,
Code:
awk -v find_name=$name_field -v pre=$pre ' { if(F == 1) { gsub(" ", "_"); NAME = pre$0; F = 0; OUT[++CNT] = NAME }
                                             else { OUT[++CNT] = $0 }
                                           }
                            $0 ~ find_name { F = 1 }
                              $0 == "$$$$" { print NAME; for(i=2; i<=CNT; i++) print OUT[i]; delete OUT; CNT = 0 }
                                         ' > $output_file_name

I think this will work but perhaps a more generalized solution would be better to allow for substitution on any requested line but not the entire input.

LMHmedchem
 

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