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Full Discussion: Script to process a list of items and uncomment lines with that item in a second file
Top Forums Shell Programming and Scripting Script to process a list of items and uncomment lines with that item in a second file Post 303042866 by LMHmedchem on Wednesday 8th of January 2020 09:40:59 PM
Old 01-08-2020
Script to process a list of items and uncomment lines with that item in a second file
Hello,

I have a src code file where I need to uncomment many lines.

The lines I need to uncomment look like,

Code:
C      CALL l_r(DESNAME,DESOUT, 'Gmax',     ESH(10),  NO_APP, JJ)

The comment is the "C" in the first column. This needs to be deleted so that there are 6 spaces preceding "CALL". The key on this line is 'Gmax'. This lets me know that the line needs to be uncommented.

I have a list of such keys
Code:
Gmax
Gmin
HS10
HS2
HS9
Hmax

Each key (including the single quotes) will occur only once in the src file being processed. I need to process the list file to look in the src file and uncomment the proper lines. There are about 300 keys in the list file.

This is what I tried,
Code:
#! /bin/bash

# file with list of items to find in modify_file
list_file=$1
# file for which a modified copy will be created
modify_file=$2
# final output file
new_file='new_'$modify_file

# copy the file being modified
cp -f $modify_file  work_on_file.txt

# loop through all the lines in the list_file
while IFS= read -r line
do

   # add single quotes
   look_for=\'$line\'

   echo "looking for line with " $look_for

   # look for the value in the current line
   # if the value is found on a line, print the substring of $0 skipping the first character
   # if the value is not on the line, just print the line
   awk -v find_to_modify=$look_for ' { if ($0 ~ find_to_modify)
                                          { print substr($0,2); }
                                       else
                                          { print $0; }
                                     } ' work_on_file.txt > new_file

   # rename the modified file from this loop for the next loop
   mv new_file  work_on_file.txt

done < "$list_file"

# rename final copy
mv work_on_file.txt  $new_file

This simply reads the list file and one at a time looks for the items in the file to modify. The awk code looks for the presence of the key on each line (including the single quotes) and if found prints the substring skipping the first character. When the key is not found on the line, the line is printed unmodified. After the key is processed, the akw modified file is renamed to be the file awk is working on for the next loop.

This works as far as I can tell. I am writing an entire copy of the modified file for each key in the list file, so this is not very efficient. The file renaming at the end of the loop is a bit kludgy as well. This only takes about 7 seconds to run, so maybe I am being picky and should just let it be but I thought I would ask if there were other suggestions.

LMHmedchem
 

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LEARN ABOUT DEBIAN

dmenu

DMENU(1)						      General Commands Manual							  DMENU(1)

NAME

       dmenu - dynamic menu

SYNOPSIS

       dmenu [-b] [-i] [-l lines] [-m monitor] [-p prompt] [-fn font] [-nb color] [-nf color] [-sb color] [-sf color] [-v]

       dmenu_run ...

       dmenu_path

DESCRIPTION

       dmenu is a dynamic menu for X, originally designed for dwm(1).  It manages huge numbers of user-defined menu items efficiently.

       dmenu reads a list of newline-separated items from standard input and creates a menu.  When the user selects an item or enters any text and
       presses Return, their choice is printed to standard output and dmenu terminates.

       dmenu_run is a dmenu script used by dwm which lists programs in the user's PATH and executes the selected item.

       dmenu_path is a program used by dmenu_run to find and cache a list of executables.

OPTIONS

       -b     dmenu appears at the bottom of the screen.

       -i     dmenu matches menu items case insensitively.

       -l lines
	      dmenu lists items vertically, with the given number of lines.

       -m monitor
	      dmenu appears on the given Xinerama screen.

       -p prompt
	      defines the prompt to be displayed to the left of the input field.

       -fn font
	      defines the font or font set used.

       -nb color
	      defines the normal background color.  #RGB, #RRGGBB, and color names are supported.

       -nf color
	      defines the normal foreground color.

       -sb color
	      defines the selected background color.

       -sf color
	      defines the selected foreground color.

       -v     prints version information to standard output, then exits.

USAGE

       dmenu is completely controlled by the keyboard.	Besides standard Unix line editing and item  selection	(Up/Down/Left/Right,  PageUp/Page-
       Down, Home/End), the following keys are recognized:

       Tab (Control-i)
	      Copy the selected item to the input field.

       Return (Control-j)
	      Confirm selection.  Prints the selected item to standard output and exits, returning success.

       Shift-Return (Control-Shift-j)
	      Confirm input.  Prints the input text to standard output and exits, returning success.

       Escape (Control-c)
	      Exit without selecting an item, returning failure.

       Control-y
	      Paste the current X selection into the input field.

SEE ALSO

       dwm(1)

								    dmenu-4.2.1 							  DMENU(1)
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