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They can also be used to randomly assign identifiers to objects or records in a database, which can help to ensure that the identifiers are unique and not predictable. cat file.txt base64 to encode cat encoded. Random strings are useful because they are difficult to guess or predict, which makes them suitable for use as passwords or other forms of authentication. This means that a new line may end up being encoded in different ways, depending on the bytes that precede and follow it. This will generate a random string of length 20 that only includes uppercase letters and digits. Base64 produces 4 bytes of output for every 3 bytes of input, so there is never a 1:1 corrispondence between the input bytes and the output bytes. For example, to generate a random string of length 20, you can use the following command: openssl rand -base64 20 | tr -dc 'a-zA-Z0-9' I would like to write a bash script to decode a base64 string. You can adjust the length of the random string by changing the number passed to the `-base64` option. Thus, the result will be QUJD REVG Rw (without spaces). But for the third, it will add a double in the output in order to complete the 4 needed characters. This will generate a random string of length 10 that only includes uppercase letters and digits. Base64 deals with the first block (producing 4 characters) and the second (as they are complete). For example, to generate a random string of length 10 that only includes uppercase letters and digits, you can use the following command: openssl rand -base64 10 | tr -dc 'a-zA-Z0-9' You can also use the `tr` command to remove any characters that you don’t want to include in your random string. The output will be a string of characters that includes letters, numbers, and special characters. This will generate a random string of length 10 using base64 encoding. For HTML : echo data:image/jpeg base64,(base64 -w 0 DSC0251.JPG).

Here is an example of how you can generate a random string of length 10: openssl rand -base64 10 Single line result: base64 -w 0 DSC0251.JPG. In your case, to decode a string stored in a variable, you should supply the string on the standard input of base64. It never reads its input from a command line argument. To generate a random string in Bash, you can use the `openssl` command and the `base64` encoding function. 1 Answer Sorted by: 30 The utility base64 reads its input either from a file whose name is supplied as an argument, or from standard input. For example, a random string might be generated using only uppercase letters and digits, or it might include a combination of letters, digits, and special characters. The length and character set of a random string can be specified in the generation process. Random strings can be generated using a computer program or a physical random number generator.