Write to a file bash

As discussed above, the simple and straightforward approach of writing to a file is using redirection operators. The above output is indicating that the existing text has been overwritten. If you do not have Vim editor on your device, then install it using:.

Open the terminal and run the code:. For this particular case, we have named it as VarFile. Now open this file by double-clicking on it and write the mandatory first line i. After doing this, type the code or script shown in the image below in your newly created Bash file. This script is asking the user about his details one by one. It takes the name, place of birth, date of birth, age, and occupation of the user as an input.

The echo command in this script is used to display messages on the terminal whereas the read command is used to store the input provided by the user in the respective variables. Once the user has provided all the inputs, this script stores the values of all these variables to a text file named BioData.

So, basically what we are trying to do is to save all the values that were provided by the user in a single text file by writing their respective variables to that file. Also, we have enclosed the variables in double quotes so that they are treated exactly as variables. When a variable is written within single quotes, then it is treated as a string.

If the file is there with the specified name, then the content of the file will be overwritten. It is used to write the output of bash commands to a file, appending the output to the existing contents of the file. If the file is not present, it creates a new one with the specified name.

It will overwrite the content if it is already present in the file. The 'ls' command is used to print all the files and folders present in the current directory.

It will save the output to the file that we specify with it, i. As shown here, the output of 'ls' command is redirected into a file. To print the contents of a file to the terminal, we can use the 'cat' command in the following form:. Suppose we want to append the system information to the specified file, we can do that in the following way:.

That is why the 'tee' command is used. The 'tee' command is used to print the input that it receives to the screen. It can save the output to a file at the same time. If we want to write the output to a file without removing the contents of the file using tee command, we can use the following form which will also print the output to the terminal:. This will not only append the output to the end of the file but also print the output on the screen.

JavaTpoint offers too many high quality services. Jim Hall Correspondent. My favorite Bash hacks. Improve your productivity with aliases and other shortcuts for the things you forget too often. Katie McLaughlin. Topics Bash. About the author. He has worked in the film and computing industry, often at the same time. He is one of the maintainers of the Slackware-based multimedia production project Slackermedia.

More about me. Recommended reading Learn Rust in An open source developer's guide to Factor App methodology. Anyone can compile open source code in these three simple steps.