How to Append One File to Another in Linux from the Shell

how to merge/append one file content to another file using shell script

cat FileA FileB > NewFile

or

cat FileA > NewFile
cat FileB >> NewFile

Append content from one file to another in Linux

ssh server2 "cat /path/to/file2" | ssh server1 "cat >> /path/to/file1"

If minimizing network traffic is an issue, use the trickier-to-quote version:

ssh server2 'cat /path/to/file2 | ssh server1 "cat >> /path/to/file2"'

The first version transfers the file to your local host, then to server1. The second version transfers the file directly from server2 to server1. (If either file path contains spaces, the quoting becomes much trickier.)

Append a file in the middle of another file in bash

Could you please try following and let me know if this helps you.

awk 'FNR==3{system("cat file2.txt")} 1' file1.txt

Output will be as follows.

I
am
a
black
dog
named
Cookie

Explanation: Checking here if line number is 3 while reading Input_file named file1.txt, if yes then using system utility of awk which will help us to call shell's commands, then I am printing the file2.txt with use of cat command. Then mentioning 1 will be printing all the lines from file1.txt. Thus we could concatenate lines from file2.txt into file1.txt.

Append file contents to the bottom of existing file in Bash

This should work:

 cat "$API" >> "$CONFIG"

You need to use the >> operator to append to a file. Redirecting with > causes the file to be overwritten. (truncated).

How to append contents of multiple files into one file

You need the cat (short for concatenate) command, with shell redirection (>) into your output file

cat 1.txt 2.txt 3.txt > 0.txt

How to directly append columns of one file to another file

With bash:

#!/bin/bash

while true; do
  read -r f1 <&3 || break
  read -r f2 <&4 || break
  echo "$f1 $f2"
done 3<fileA 4<fileB >fileC

Output to fileC:

1 1
2 2
3 3

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See: https://unix.stackexchange.com/a/26604/74329

How do I append text to a file?

cat >> filename
This is text, perhaps pasted in from some other source.
Or else entered at the keyboard, doesn't matter. 
^D

Essentially, you can dump any text you want into the file. CTRL-D sends an end-of-file signal, which terminates input and returns you to the shell.

How to append the contents of a file into another file starting from a marker?

#!/bin/bash
sed '/<BEGIN>/ {
    r file2
    d
}' < file1 > output_file

Note: If you want to keep the line with <BEGIN> just use:

 sed '/<BEGIN>/r file2' < file1 > output_file

Proof of Concept

$ ./insertf.sh
Line 1
This is another line a
and another
/* This is a line With Special Characters */
/* Another line with @ special stuff \ ? # ! ~ */
/* and another */

few more lines.

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