To append text to the end of a file in Linux, you can use the echo command followed by the text you want to append and the >> operator to redirect the output to the file. For example:
echo "This text will be appended to the end of the file" >> file.txt
This will add the specified text to the end of the file file.txt. If the file does not exist, it will be created.
You can also use the tee command to append text to a file. For example:
echo "This text will be appended to the end of the file" | tee -a file.txt
This will append the output of the echo command to the file file.txt. The -a option tells tee to append the output to the file rather than overwriting it.
Both of these commands can be used in a script or at the command line.