Just for the exercise, here's a version of ssb-blob-path written in FiSH shell:

ssb-blob-path.fish

Requirements

• fish (only tested with v2.7.1)
• base64 (coreutils)
• xxd (vim?)

Usage

  ssb-blob-path.fish [-h|--help] [BLOB_ID [BLOB_ID …]]

If not given on the command line, one or more BLOB_IDs can be read from standard input.

Examples

  $ ssb-blob-path.fish '&O2V61izsKwCsDJnuI43Gb39FTUxDNY0lsFM7gAKNCKI=.sha256'
  /home/kas/.ssb/blobs/sha256/3b/657ad62cec2b00ac0c99ee238dc66f7f454d4c43358d25b0533b80028d08a2
  $ echo '&O2V61izsKwCsDJnuI43Gb39FTUxDNY0lsFM7gAKNCKI=.sha256' | ssb-blob-path.fish
  /home/kas/.ssb/blobs/sha256/3b/657ad62cec2b00ac0c99ee238dc66f7f454d4c43358d25b0533b80028d08a2