How do I append text to end of file using the cli on Linux? How to add lines to end of file? How to Linux logs work?! What command I need to type to send the output of the command to end of file?!
You need to use the “>>” to append text to end of file. It is also useful to redirect and append/add line to end of file on Linux or Unix-like system.
Append Text Using >> Operator
Using >> you add a new line of specific text to your text file.
Code language: PHP (php)
# Append a row in a text file echo "Lateweb.info is one hell of a good site" >> filename.txt or printf "If you like us please subscribe for our youtube channel" >> filename.txt
You can also use the cat command to link text from one or more files and add it to another file.
cat /var/log/auth.log >> filename.txt
As you may have guessed, you can use different commands to insert values into additional rows. Another such example is the ls command to list files and folders.
Code language: CSS (css)
# Add a list of files and folder to filename.txt ls >> files.txt
Difference between > and >>
> is used when wiping out an existing file is ok. This often means that outputs continually overwrites a file based on the latest current state of things. For instance every time you test a program you might over-write the previous test output.
>> is used for items such as logging events, parsing or other data processing where data is created or transformed piece by piece into a new form
>will create/replace the output file with name
>>will create (if file
listnot exists already) or append the file
$ ls > allmyfiles.txt creates the file “allmyfiles.txt” and fills it with the directory listing from the ls command
$ echo "End of directory listing" >> allmyfiles.txt adds “End of directory listing” to the end of the file “allmyfiles.txt”
$ > newzerobytefile creates a new zero byte file with the name “newzerobytefile” or overwrites an existing file of the same name (making it zero bytes in size)