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 06:09 AM.. Reason: break added, cosmetic changes

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LEARN ABOUT DEBIAN

cscope-indexer

cscope-indexer(1)					      General Commands Manual						 cscope-indexer(1)

NAME

       cscope-indexer - Script to index files for cscope

SYNOPSIS

       cscope-indexer [-v] [-f database_file] [-i list_file] [-l] [-r]

DESCRIPTION

       This  script  generates	a list of files to index (cscope.out), which is then (optionally) used to generate a cscope database.  You can use
       this script to just build a list of files, or it can be used to build a list and database.  This script is not used to just build  a  data-
       base (skipping the list of files step), as this can be simply done by just calling "cscope -b".

       Normally,  cscope will do its own indexing, but this script can be used to force indexing.  This is useful if you need to recurse into sub-
       directories, or have many files to index (you can run this script from a cron job, during the night).  It is especially	useful	for  large
       projects,  which  can  contstantly  have source files added and deleted; by using this script, the changing sources files are automatically
       handled.

       Currently, any paths containing "/CVS/" or "/RCS/" are stripped out (ignored).

OPTIONS

       -f database_file
	      Specifies the cscope database file (default: cscope.out).

       -i list_file
	      Specifies the name of the file into which the list of files to index is placed (default: cscope.files).

       -l     Suppress the generation/updating of the cscope database file.  Only a list of files is generated.

       -r     Recurse into subdirectories to locate files to index.  Without this option, only the current directory is searched.

       -v     Be verbose.  Output simple progress messages.

SEE ALSO

       cscope(1)

AUTHOR

       This manual page was written for the Debian GNU/Linux system by Robert Lemmen <robertle@semistable.com> (but may  be  used  by  others,	of
       course)

Script to index files for cscope				 30. December 2002						 cscope-indexer(1)