Shell Programming and Scripting

code test
line code test3
asdfasdf
do for while

line1: 

code test
line code test3
asdfasdf
do for while

line2:

code test
line code test3
asdfasdf
do for while

datapath1
datapath2
datapath3

pathdata1
pathdata2
pathdata3

code test
line code test3
asdfasdf
do for while

datapath1

code test
line code test3
asdfasdf
do for while

pathdata1

code test
line code test3
asdfasdf
do for while

#!/bin/bash

i=1
while read line;do
  if((i==7));then
    echo 'dir1='
  elif((i==48));then
    echo 'dir2='
  else
    echo "$line"
  fi
  ((i++))
done  < main.txt > main1.txt

0 $ cat main.txt 
line
line0:
blödsinn

line1:

namal blöd
line2:

schluss
0 $ cat paths.txt 
/some/path/1
/some/other/path/2
/some/path/3

0 $ bash txt_manip.sh 
0 $ cat main.txt
line
dir0=/some/path/1
blödsinn

dir1=/some/other/path/2

namal blöd
dir2=/some/path/3

schluss
0 $

#!/bin/bash
FILE=main.txt
cp $FILE $FILE.bkup.$$
declare -a ar_PATH=($(<paths.txt))
declare -a ar_LINE=($(grep "line.:" "$FILE"))
C=0

for LINE in "${ar_LINE[@]}"
do
	sed s,"$LINE","dir$C=${ar_PATH[$C]}",g -i "$FILE" > "${FILE/\.txt/$C}.txt"
	((C++))
done

awk '
FNR == 1 {
	# Note start of an input file...
	f++
}
{	# Count the number of lines in each input file and gather text.
	l[f, ++lc[f]] = $0
	next
}
END {	# Verify that the 2nd and 3rd files are not empty and contain the same
	# number of lines.
	if(lc[2] != lc[3] || lc[2] == 0) {
		print "2nd and 3rd files must contain the same # of lines > 0"
		exit 1
	}
	# Create one output file for each line in the 2nd and 3rd files.
	for(i = 1; i <= lc[2]; i++) {
		# Create the output file name.
		fn = "main_" i ".txt"
		# Copy lines from the appropriate input file to the output file.
		for(j = 1; j <= lc[1]; j++)
			print (l[1, j] ~ /^line1:/ ? l[2, i] : \
			       l[1, j] ~ /^line2:/ ? l[3, i] : \
			       l[1, j]) > fn
		# Close the output file.
		close(fn)
	}
}' main.txt path1 path2

awk ' 
FNR == 1        {f++
                }   
f < 3           {line[FNR, f]=$0
                 next
                }
                {TMP=substr ($1, 5, 1)
                 TML=/line[12]/
                 for (i=1; i<=3; i++)   {if (TML) $0 = line[i, TMP]
                                         print > "main_" i ".txt"  
                                        }
                }

'  path1 path2 main.txt