Shell Programming and Scripting

awk 'FNR==1{p=$0; $51=$0=x; $0=$0 ORS FILENAME ":" ORS p}1' OFS="\= " file*

#!/bin/bash


printme(){
		# change here whatever you want
		echo $(printf '=%.0s' {1..75})
	 }

for file in *.txt ; do
		# print something n times
		printme
		
		# Name of your file
		echo "$file :"
		
		# content of your file
		cat  $file

		# print something n times
		printme
done

awk '                                                    
  FNR==1{                           # If we are at the first line of a new file
    p=$0                            # Save the line in variable  "p"
    $51=$0=x                        # make the line empty ($0=x) and als make $51 empty ($51=x). By doing so 50 other empty fields are created with the value of OFS in between, which is set to "\ "
    $0=$0 ORS FILENAME ":" ORS p    # set the current line to $0 which now contains the 50 = characters and ORS which is set to '\n' and the filename of the file, another '\n' and the original line content that was saved in variable "p"
  }
  1                                 # print the record
' OFS="\= " file*                   # set OFS to "\= " and specify which files to read

awk 'BEGIN{
		while(++i<75)
		text = text "="
	  }
    FNR==1{
		print text RS FILENAME " :"
          }1
       END{
                print text
          }' *.txt