for file in path/to/folder > For iterating in a folder. <> param.Before proceeding with the code snippet, lets examine each bash command that will be utilized to create random file names. I wrote this simple function to do the work, and it can be easily modified. This comes in handy when you need to generate a long, secure password for example. I try to write bash to generate string,combine lowercase letters 6 random characters lowercase letters together. Generate Random Names For Text Files Using Bash Command. If you require genuinely random data, cat /dev/random instead of /dev/urandom. Initialized by assigning a value to RANDOM. bashrc file to generate a random string of alphanumeric characters. 14 Answers Sorted by: 136 Assuming you are on a linux, the following should work: cat /dev/urandom tr -cd 'a-f0-9' head -c 32 This is only pseudo-random if your system runs low on entropy, but is (on linux) guaranteed to terminate. This feature of RANDOM is mentioned in the bash(1) manual RANDOM Each time this parameter is referenced, a random integer betweenħ is generated. $ bash -c "RANDOM=$SEED_FOR_MY_GAME echo \$RANDOM" Either use single quotes to turn off interpolation (as shown above) or otherwise prevent the interpolation: $ RANDOM=42 Notice that single quotes are used double quotes run afoul shell interpolation rules: $ bash -c 'RANDOM=42 echo $RANDOM $RANDOM $RANDOM'īecause $RANDOM is being interpolated by the parent shell before the child bash -c. Bash has the RANDOM variable, which produces a random number. $ bash -c 'RANDOM=640 echo $RANDOM $RANDOM $RANDOM' The very first method we can use to generate a random string in bash is md5 checksums. Assign a seed value to RANDOM $ bash -c 'RANDOM=640 echo $RANDOM $RANDOM $RANDOM' To generate a random string in Bash, you can use the openssl command and the base64 encoding function.
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