convert_unixtime_to_date_mac.sh

#!/usr/bin/env bash

input_file=$1

if ! [ $# -eq 1 ]; then
    echo "Please specify INPUT_FILE"
    echo Usage:
    echo "$(basename $0)" INPUT_FILE
    echo ex:
    echo "$(basename $0)" unixtime.txt
    echo ""
    exit 1
fi

if ! [[ -f "${input_file}" ]]; then
    echo file: ${input_file} does not exit
    exit 1
fi


echo "" > ${input_file}_date.txt
while IFS= read -r line; do
    date="$(date -r ${line} +"%Y-%m-%d %H:%M:%S")"
    echo ${line} ${date}

    echo ${date} >> ${input_file}_date.txt
done < ${input_file}

input_file ex.

1595379363
1595379664
1595379765