Catenate files with blank lines between them [duplicate] - bash

Question

This question already has answers here:
Concatenating Files And Insert New Line In Between Files
(8 answers)
Closed 7 years ago.
How can we copy all the contents of all the files in a given directory into a file so that there are two empty lines between contents of each files?
Need not to mention, I am new to bash scripting, and I know this is not an extra complicated code!
Any help will be greatly appreciated.
Related links are following:
* How do I compare the contents of all the files in a directory against another directory?
* Append contents of one file into another
* BASH: Copy all files and directories into another directory in the same parent directory
After reading comments, my initial attempt is this:
cat * > newfile.txt
But this does not create two empty lines between contents of each new files.

Answer 1

Try this.
awk 'FNR==1 && NR>1 { printf("\n\n") }1' * >newfile.txt
The variable FNR is the line number within the current file and NR is the line number overall.

Answer 2

One way:
(
files=(*)
cat "${files[0]}"
for (( i = 1; i < "${#files[#]}" ; ++i )) ; do
echo
echo
cat "${files[i]}"
done
) > newfile.txt

Answer 3

Example of file organization:
I have a directory ~/Pictures/Temp
If I wanted to move PNG's from that directory to another directory I would first want to set a variable for my file names:
# This could be other file types as well
file=$(find ~/Pictures/Temp/*.png)
Of course there are many ways to view this check out:
$ man find
$ man ls
Then I would want to set a directory variable (especially if this directory is going to be something like a date
dir=$(some defining command here perhaps an awk of an ls -lt)
# Then we want to check for that directories existence and make it if
# it doesn't exist
[[ -e $dir ]] || mkdir "$dir"
# [[ -d $dir ]] will work here as well
You could write a for loop:
# t is time with the sleep this will be in seconds
# super useful with an every minute crontab
for ((t=1; t<59; t++));
do
# see above
file=$(blah blah)
# do nothing if there is no file to move
[[ -z $file ]] || mv "$file" "$dir/$file"
sleep 1
done
Please Google this if any of it seems unclear here are some useful links:
https://www.gnu.org/software/gawk/manual/html_node/For-Statement.html
http://www.gnu.org/software/gawk/manual/gawk.html
Best link on this page is below:
http://mywiki.wooledge.org/BashFAQ/031
Edit:
Anyhow where I was going with that whole answer is that you could easily write a script that will organize certain files on your system for 60 sec and write a crontab to automatically do your organizing for you:
crontab -e
Here is an example
$ crontab -l
* * * * * ~/Applications/Startup/Desktop-Cleanup.sh
# where ~/Applications/Startup/Desktop-Cleanup.sh is a custom application that I wrote