Bash script that joins two or more files in a single one.

join_files.sh

#!/bin/bash
# Bash utility that joins every file provided as argument
# and outputs a new file called output.txt.

# bash trap function is executed when CTRL+C is pressed
trap quitprogram INT
 
quitprogram() {
    echo -e "CTRL+C Detected!\nExiting..."
    exit
}

echo -n "Creating output.txt file... "
if [ -f output.txt ]; then
    echo "it already exists."
else
    touch output.txt
    echo "done."
fi
 
for file in "$@"; do
    echo -n "Joining $file... "
    cat $file >> output.txt
    #sleep 1
    echo "done."
done
 
echo "Success! Your files have been joined into output.txt."