Method 1:-You can write/append content line by line using the multiple echo commands. Add character at the beginning of each line using sed command. If the text file is small enough to fit in memory, you don't have to create a temporary file to replace it with. And it goes without saying that the most popular command line tools for this in Linux are sed and awk – the two best text processing programs.. But the issue with this command is that it is appending the first line of the file and traversing entire file. As far as I know there is no prepend operator on a bash or any other shell, however there are many ways to do the same. You can load it all into memory and write it back out to the file. Since its very huge file (14GB) this is taking very long time. Example-1: Append line to the file using ‘echo’ command and ‘>>’ symbol. A single number selects that one line. Add a line in a specific position with Linux. To add two lines of text, separate each line with the \n option: printf ‘First line of text\n Second line of text’ test6.txt. To add a single line of text, enter: printf ‘First line of text\n’ test5.txt. If the input value is not empty, then the ‘echo’ command will append the value into the books.txt file by using ‘>>’ symbol. So, the lines will be added to the file AFTER the line where condition matches. Note the comma between 1 and 4. You can use multiple methods to write multiple lines to a file through the command line in the Linux system. In this article, I will provide an example of how to insert a line before and after a match using sed, which is a common task for customizing configuration files. Here is my sample file # cat /tmp/file Line One Line Two Line Three Line Four Line Five . Bash prepend a text using a temporary file. Sometimes you may be required to write or append multiple lines to a file. sed "a" command lets us append lines to a file, based on the line number or regex provided. echo "$(echo 'task goes here' | cat - todo.txt)" > todo.txt It's impossible to add lines to the beginning of the file without over writing the whole file. The p means “print matched lines.” By default, sed prints all lines. Linux: Using sed to insert lines before or after a match The sed utility is a powerful utility for doing text transformations. To select some lines from the file, we provide the start and end lines of the range we want to select. To extract lines one to four, we type this command: sed -n '1,4p' coleridge.txt. Append a prefix in front of every line of a file. */PREFIX: &/p' /tmp/file PREFIX: Line One PREFIX: Line Two PREFIX: Line Three PREFIX: Line Four PREFIX: Line Five You can use ed, sed, perl, awk and so on to add text to the beginning of a file in Bash under Linux or Unix-like systems. Here are the three methods described below. Consider this file: line 1 line 2 line 4 To start the editor in a Linux system, type vi followed by the name of the file you want to edit, like this: vi /etc/fstab The vi editor loads the file into memory, displays the first few lines in a text screen, and positions the cursor on the first line. From time to time it is required to modify some file very fast. You can use the cat command on either of these files to display their contents. Here is simple solution using a temporary file to prepend text: For the last line it's again traversing the entire file and appending a last line. If you need to add a line to a file in Linux, and you need to add that line in a specific position of the file there is an easy solution, even if you need to do it to hundreds of thousands of files. 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