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Bash generate random alphanumeric string
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| #!/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 |
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