Check the time of the current block in a Cosmos blockchain

echo BLOCK: $(curl -s 127.0.0.1:26657/status |\
 jq -r '.result.sync_info.latest_block_time');\
echo "NOW:   $(LC_TIME=C date -u +%Y-%m-%dT%X.%NZ)" 

Blockchain perspective 

If you deal with a Cosmos based blockchain, this command (actually there are 2 commands) helps to visualise the difference between the time of the latest block and current time. That's helpful if a node needs to catch up (e.g. after restarting from a snapshot). 

UNIX perspective 

The command has a few interesting "UNIX features". First, the curl from the localhost is silent (-s option) to avoid showing download stats. Its output is redirected to jq, which presents the raw (-r option) the time of latest block (.result.sync_info.lastest_block_time field). 

The second command returns the current time. The LC_TIME=Csets the locale to a standard, non-localized format, ensuring the output is always in a 24-hour clock and not a 12-hour AM/PM format, which can vary by location.  The option -u forces the output in the UTC, rather than the local time. Finally, +%Y-%m-%dT%X.%NZ formats date identical like the cosmos endpoint. 

Take me to the git home (and checkout me back)

I'm moving quite a lot around git projects. For some time, I have been wondering if there is a way to have an equivalent of argumentless `cd`. But rather of taking you back $HOME, changing directory to the git top-level one. I decided to make a deeper dive into the problem and ended up with the following function in zsh:

  function cdt ()
   cd $(git rev-parse --show-toplevel)}

Originally, I had an alias, but it did not work as designed. It took a root of git repository when sources (usually, during shell start). For a refernce that is my original alias.

  alias cdt="cd $(git rev-parse --show-toplevel)"

Another "dimension" of git project you can move around are branches. Last year, I learnt that the `-` works in the `git checkout` the same as in the `cd` command. So if we switch between branches, try:

  git checkout -