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Using Diode CLI in Shell Scripts

#tl;dr

$ diode config 2>&1 | awk '/<address>/ { print $(NF) }'
0x55c8ee625db628b493b1d084afe25e962a570cdf

If you want to use the Diode CLI in shell scripts be aware that most [INFO] output is written to stderr which by default is not catched by pipes. So if you want to use Diode CLI output in your script you might want to redirect stderr to stdout

#For example extracting the client id:

By default the diode config command shows all configuration values and exits:

$ diode config
[INFO] Diode Client version : v0.4.13 07 Oct 2020
[INFO] Client address       : 0x55c8ee625db628b493b1d084afe25e962a570cdf
[INFO] Fleet address        : 0x979d4824fefd8910c6db45ac45e956678fb04ed0
[INFO] <KEY>                : <VALUE>
[INFO] fleet                : 0x979d4824fefd8910c6db45ac45e956678fb04ed0
[INFO] last_update_at       : 0x5f847c04
[INFO] lvbh3                : 0x0000017b2dde638c7cb0e4df1f9dd5074bec640e41e230e8cabd58943fbe4853
[INFO] lvbn3                : 0x0d5b92
[INFO] <address>            : 0x55c8ee625db628b493b1d084afe25e962a570cdf
[INFO] private              : <********************************>

To extract from this only the local client address we first have to pipe the output to stderr and then filter only the address field value. We’re using two operations here:

  1. 2>&1 is a bash expression that redirects stderr to stdout
  2. awk is a filter program and allows us to select a row and a field. In this case we’re using the special constant NF (number of fields) as we want the last field in the <address> row:
$ diode config 2>&1 | awk '/<address>/ { print $(NF) }'
0x55c8ee625db628b493b1d084afe25e962a570cdf

Happy hacking!