This time, I created a bash script to analyze web server access log.
Step 1: Create a new folder using mkdir
mkdir log_analysis_folder
Step 2: Move into the new folder
cd log_analysis_folder
Step 3: Create a new bash script using vi
vi log_analysis_script.sh
I created few variables to find unique ip address, total number of records and request method etc.
- unique_ip=$(cat “$log_file” | awk ‘{print $3}’ | sort -u)
→ This command utilizes cat to read the log file, awk to extract the IP address field, and sort to obtain a list of unique IP addresses.
- record=$(cat “$log_file” | wc -l)
- method=$(cat “$log_file” | awk ‘{print $6}’ | sort -u | tr ‘\n’ ‘,’)
→ This will only display sixth field and sort unique method request.
- access_count=$(cat “$log_file” | awk ‘{print $3}’ | sort | uniq -c | sort -nr | head -1 | awk ‘{print $2})
→ This command extracts the sixth field from the specified log file using awk, sorts the unique method requests using sort -u, and then uses tr to replace newlines with commas for a formatted display.
- timestamp=$(cat “$log_file” | awk ‘{print strftime(“%Y-%m-%d %H:%M:%S”, $1)}’ | sort -u | head -1 | awk ‘{print $1})
→ This command converts the timestamps in the specified log file to a human-readable format using awk and strftime. It then sorts the unique timestamps, selects the earliest one with head -1, and extracts the first field of the result using another awk command.
- total_response_time=$( cat “$log_file” |awk ‘{sum += $2} END {print sum}’)
→ This command calculates the total response time by summing the values in the second field (response time) of each log entry in the specified log file using awk. It then displays the total sum of response times.
- avg_response=$((total_response_time / record))
Let’s implement those variables in the echo statements.
Once you are done, make bash script executable with chmod command.
Result
