Forked from earthgecko/bash.generate.random.alphanumeric.string.sh
Last active
July 26, 2018 07:24
-
-
Save danny-source/9132f9872a2ab34b7f7df3fadfedcab8 to your computer and use it in GitHub Desktop.
shell/bash 亂數產生 數字、大小寫字母
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/bin/bash | |
# bash generate random alphanumeric string | |
# | |
# bash generate random 32 character alphanumeric string (upper and lowercase) and | |
NEW_UUID=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1) | |
# bash generate random 32 character alphanumeric string (lowercase only) | |
cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1 | |
# Random numbers in a range, more randomly distributed than $RANDOM which is not | |
# very random in terms of distribution of numbers. | |
# bash generate random number between 0 and 9 | |
cat /dev/urandom | tr -dc '0-9' | fold -w 256 | head -n 1 | head --bytes 1 | |
# bash generate random number between 0 and 99 | |
NUMBER=$(cat /dev/urandom | tr -dc '0-9' | fold -w 256 | head -n 1 | sed -e 's/^0*//' | head --bytes 2) | |
if [ "$NUMBER" == "" ]; then | |
NUMBER=0 | |
fi | |
# bash generate random number between 0 and 999 | |
NUMBER=$(cat /dev/urandom | tr -dc '0-9' | fold -w 256 | head -n 1 | sed -e 's/^0*//' | head --bytes 3) | |
if [ "$NUMBER" == "" ]; then | |
NUMBER=0 | |
fi |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment