Script to process a list of items and uncomment lines with that item in a second file Post: 303042875

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Top Forums Shell Programming and Scripting Script to process a list of items and uncomment lines with that item in a second file Post 303042875 by MadeInGermany on Thursday 9th of January 2020 04:51:46 AM

01-09-2020

Registered User

Or do all in bash - here is a well documented bash version:

Code:

#! /bin/bash
# bash v3 or higher

# 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

echo "reading values from '$list_file'"
# clear (and implicityly declare) an array
list=()
while read line
do
  echo "adding '$line' to list"
  list+=("$line")
done < $list_file

echo "reading '$modify_file'"
# loop through all the lines in the list_file
while IFS= read -r line <&3
do
   # 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
   # otherwise just print the line

   echo "processing line $((++linecnt))"
    # preset the new line
   outline=$line
   # loop through the array values
   for i in "${list[@]}"
   do
      look_for="'$i'"
      # =~ is ERE match, == is glob match
      # $look_for in quotes --> do not interpret special characters in it
      #if [[ $line =~ "$look_for" ]]
      if [[ $line == *"$look_for"* ]]
      then
         outline=${line:1}
         # further matches will do the same, so we can break the loop here
         break
      fi
   done
   # print the new line
   printf "%s\n" "$outline" >&4
done 3< "$modify_file" 4> "$new_file"

Last edited by MadeInGermany; 01-09-2020 at 07:09 AM.. Reason: break added, cosmetic changes

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libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

Linux								       Epoch								     Linux