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Convert seconds past datetime to datetime
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| #!/bin/bash | |
| # Function to calculate datetime after a given number of seconds from a starting datetime | |
| calculate_datetime() { | |
| local start_datetime="$1" | |
| local elapsed_seconds="$2" | |
| # Convert the start datetime to seconds since the epoch | |
| local start_epoch=$(date -d "$start_datetime" +%s) | |
| # Add the elapsed seconds (including fractional part) | |
| local result_epoch=$(echo "$start_epoch + $elapsed_seconds" | bc) | |
| # Convert the result back to a human-readable date-time format (without fractional seconds) | |
| local result_datetime=$(date -d "@$result_epoch" +"%Y-%m-%d %H:%M:%S") | |
| # Output the resulting datetime | |
| echo "$result_datetime" | |
| } | |
| # Example usage of the function | |
| # Uncomment the lines below to test the function directly in the script | |
| #start_datetime="2024-08-12 08:00:00" | |
| #elapsed_seconds="45736.799" | |
| #result=$(calculate_datetime "$start_datetime" "$elapsed_seconds") | |
| #echo "The resulting datetime is: $result" |
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| #!/bin/bash | |
| # Function to calculate datetime after a given number of seconds from a starting datetime | |
| calculate_datetime() { | |
| local start_datetime="$1" | |
| local elapsed_seconds="$2" | |
| # Convert the start datetime to seconds since the epoch | |
| local start_epoch=$(date -d "$start_datetime" +%s) | |
| # Add the elapsed seconds (including fractional part) | |
| local result_epoch=$(echo "$start_epoch + $elapsed_seconds" | bc) | |
| # Convert the result back to a human-readable date-time format (without fractional seconds) | |
| local result_datetime=$(date -d "@$result_epoch" +"%Y-%m-%d %H:%M:%S") | |
| # Output the resulting datetime | |
| echo "$result_datetime" | |
| } | |
| # Check if the correct number of arguments is provided | |
| if [ $# -ne 2 ]; then | |
| echo "Usage: $0 <log_file> <initial_datetime>" | |
| echo "Example: $0 /path/to/log_file.txt '2024-08-12 08:00:00'" | |
| exit 1 | |
| fi | |
| # Assign arguments to variables | |
| log_file="$1" | |
| initial_datetime="$2" | |
| # Check if the log file exists | |
| if [ ! -f "$log_file" ]; then | |
| echo "Error: Log file not found!" | |
| exit 1 | |
| fi | |
| # Process each line in the log file | |
| while IFS= read -r log_line; do | |
| # Extract the time value (e.g., 12.592) from the log line using a regular expression | |
| elapsed_seconds=$(echo "$log_line" | grep -oP '\[\s*\K[\d\.]+') | |
| # If a valid elapsed time is found, calculate the corresponding datetime | |
| if [ ! -z "$elapsed_seconds" ]; then | |
| datetime=$(calculate_datetime "$initial_datetime" "$elapsed_seconds") | |
| # Replace the time value in the log line with the calculated datetime | |
| new_log_line=$(echo "$log_line" | sed "s/\[\s*$elapsed_seconds\]/[$datetime]/") | |
| # Output the modified log line | |
| echo "$new_log_line" | |
| else | |
| # If no time value is found, print the line as is | |
| echo "$log_line" | |
| fi | |
| done < "$log_file" |
curl https://gist.githubusercontent.com/meetnick/eccc5dfea67a6baa2300cb4853e575d6/raw/e70f1dc5525c5f0cb56144e52ce3ab9750aeb65a/process_log_file.sh | bash -s /var/log/Xorg.0.log "2024-08-07 11:44:32"
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Here's how to use it:
chmod +x process_log_file.sh./process_log_file.sh /path/to/your_log_file.txt '2024-08-12 08:00:00'