Super-duper-simple JSON log to JSON converter

jl2j.sh

#!/bin/bash

####################################################
#   Super-duper-simple JSON log to JSON converter  #
#                                                  #
#   Install:                                       #
#     $ curl $RAW_GIST_URL -o jl2j                 #
#     $ chmod +x jl2j                              #
#     $ sudo mv jl2j /usr/local/bin                #
#                                                  #
#   Usage:                                         #
#     $ jl2j logfile.txt > logfile.json            #
#     $ jl2j '{"key": "value"} \                   #
#       {"key": "value"}' > log.json               #
#     $ echo '{"key": "value"} \                   #
#       {"key": "value"}' | jl2j > log.json        #
####################################################

# Test if the input is empty and pipe in STDIN
if [[ "$1" == "" ]]; then
  OUTPUT=$(< /dev/stdin)
# Otherwise check for a help flag
elif [[ "$1" == "-h" ]] || [[ "$1" == "--help" ]]; then
  echo "JSON Log to JSON Converter"
  echo ""
  echo "Usage:"
  echo ""
  echo "\$ jl2j \$FILE_OR_STRING > new_file.json"
  echo "or"
  echo "\$ echo \$STRING | jl2j > new_file.json"
  echo ""
  exit 0
# If not, test if it's a file
elif [[ -f $1 ]]; then
  OUTPUT=$(echo "$(cat $1)")
else
# If not, treat it as a string
  OUTPUT=$(echo "$1")
fi

# Wrap it in array brackets, replace line breaks with commas,
# and drop the last comma
echo "[ $OUTPUT ]" | tr '}\n' '}, ' | sed 's/.$//'