Concatenate multiple files but include filename as

Question

I would like to concatenate a number of text files into one large file in terminal. I know I can do this using the cat command. However, I would like the filename of each file to precede the "data dump" for that file. Anyone know how to do this?

what I currently have:

file1.txt = bluemoongoodbeer

file2.txt = awesomepossum

file3.txt = hownowbrowncow

cat file1.txt file2.txt file3.txt

desired output:

file1

bluemoongoodbeer

file2

awesomepossum

file3

hownowbrowncow

Answer 1

Here is a really simple way. You said you want to cat, which implies you want to view the entire file. But you also need the filename printed.

Try this

head -n99999999 * or head -n99999999 file1.txt file2.txt file3.txt

Hope that helps

Answer 2

find . -type f -exec cat {} \; -print

Answer 3

If you want the result in the same format as your desired output you can try:

for file in `ls file{1..3}.txt`; \
do echo $file | cut -d '.' -f 1; \ 
cat $file  ; done;

Result:

file1
bluemoongoodbeer
file2
awesomepossum
file3
hownowbrowncow

You can put echo -e before and after the cut so you have the spacing between the lines as well:

$ for file in `ls file{1..3}.txt`; do echo $file | cut -d '.' -f 1; echo -e; cat $file; echo -e  ; done;

Result:

file1

bluemoongoodbeer

file2

awesomepossum

file3

hownowbrowncow

Answer 4

For solving this tasks I usually use the following command:

$ cat file{1..3}.txt >> result.txt

It's a very convenient way to concatenate files if the number of files is quite large.

Answer 5

I like this option

for x in $(ls ./*.php); do echo $x; cat $x | grep -i 'menuItem'; done

Output looks like this:

./debug-things.php
./Facebook.Pixel.Code.php
./footer.trusted.seller.items.php
./GoogleAnalytics.php
./JivositeCode.php
./Live-Messenger.php
./mPopex.php
./NOTIFICATIONS-box.php
./reviewPopUp_Frame.php
            $('#top-nav-scroller-pos-<?=$active**MenuItem**;?>').addClass('active');
            gotTo**MenuItem**();
./Reviews-Frames-PopUps.php
./social.media.login.btns.php
./social-side-bar.php
./staticWalletsAlerst.php
./tmp-fix.php
./top-nav-scroller.php
$active**MenuItem** = '0';
        $active**MenuItem** = '1';
        $active**MenuItem** = '2';
        $active**MenuItem** = '3';
./Waiting-Overlay.php
./Yandex.Metrika.php

Answer 6

I used grep for something similar:

grep "" *.txt

It does not give you a 'header', but prefixes every line with the filename.