ltsvkey.sh

#!/bin/bash

# written by msroz
#{{shelldoc}}
# Name:
#   ltsvkey.sh - print ltsv key with line number
#
# Usage:
#   ./ltsvkey.sh < ltsv.file
#   head ltsv.file | ./ltsvkey.sh
#
# Remarks:
#
# Dependencies:
#
#{{shelldoc}}

set -euC

count=1
first_line=$(cat - | head -n 1)

printf "%-3s\t%-30s\t%-30s\n" 'number' 'key' 'example'
echo '------------------------------------------------'

IFS=$(echo -e '\t') # Do not split space
for field in $first_line; do
  key=$(echo $field | cut -d ':' -f 1)
  value=$(echo $field | cut -d ':' -f 2-)

  printf "%-3s\t%-30s\t%-30s\n" $count $key $value

  count=$(expr $count + 1)
done
IFS=$' \t\n'

exit 0

tail -n 1 /path/to/ltsv.log | bash <(curl -s https://gist.githubusercontent.com/msroz/89ded2a2e4da1263acdf87b002d53363/raw/6693b1aa98450d3c2d59fdfdfecf38ff9a6b4ff8/ltsvkey.sh)