However, to generate a random string consisting of lowercase letters only, we will modify the tr command: $ cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 20 | head -n 5 This random number includes both the uppercase and the lowercase characters. In addition, the head command displays only the first line of the output.Īrgument 32 with the fold command shows the random string of length 32, and argument 1 indicates the number of strings that appear on the screen. The fold command then folds the output according to the limit given. The tr command picks the particular characters from the standard input and pipes the output to the fold command. To generate a random 32-character string, we’ll use the /dev/urandom file in combination with the head and fold command: $ cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1 We can also use this to create a random string. This file provides access to the kernel’s random number generated. The urandom is a special file located at /dev.
These devices act as an intermediary between the kernel and the hardware. By default, the files located in /dev are known as pseudo devices. Since everything in Linux is treated as a file, we can utilize this feature. We can also use the devices as files to generate a random number. This script is very useful in generating strong passwords for any use. After that, we’ll pipe the output fold and head command: #!/bin/bashįor i in " To generate several sequences, we’ll perform the same in the nested loop. This script will generate one sequence of random characters.
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