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September 21, 2026 10:39
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Shell script to convert unix timestamp to base36 (alphanumeric, lowercase)
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| #!/bin/bash | |
| # takes unix timestamp and converts to base36 | |
| # ht: https://en.wikipedia.org/wiki/Base36#bash_implementation | |
| value=$(date +%s) | |
| result="" | |
| base36="0123456789abcdefghijklmnopqrstuvwxyz" | |
| while true; do | |
| result=${base36:((value%36)):1}${result} | |
| if [ $((value=${value}/36)) -eq 0 ]; then | |
| break | |
| fi | |
| done | |
| echo ${result} |
Author
Nice base36 converter.
The openssl (and unix) base64 algorithm is for encoding binary data into ASCII strings, not for converting integers to different radix (numeric base). https://en.wikipedia.org/wiki/Base64
To convert an integer to an exotic numeric base you'll need something like these: https://stackoverflow.com/questions/14471692/bash-decimal-to-base-62-conversion
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@caorongjin said:
LOL. @typora actually is a bit weird in handling case differences. I'll do a bit of testing, and if I can work out the pattern, will post a bug report.