Shell script - BASH - for filtering entries on log from the last 10 minutes only

get_last_10_minutes_from_log.sh

#!/bin/bash

## Usage
# save the contents of this file to a executable file,
# call it, passing the target log file as first argument

# apapt the lines below for match your log file format
dates=("`date --date="-10 min" "+%_d %H:%M"`" \
"`date --date="-9 min" "+%_d %H:%M"`" \
"`date --date="-8 min" "+%_d %H:%M"`" \
"`date --date="-7 min" "+%_d %H:%M"`" \
"`date --date="-6 min" "+%_d %H:%M"`" \
"`date --date="-5 min" "+%_d %H:%M"`" \
"`date --date="-4 min" "+%_d %H:%M"`" \
"`date --date="-3 min" "+%_d %H:%M"`" \
"`date --date="-2 min" "+%_d %H:%M"`" \
"`date --date="-1 min" "+%_d %H:%M"`" \
"`date --date="-0 min" "+%_d %H:%M"`" \
);

command_line="grep -E \"";

for i in "${dates[@]}"
do
  command_line="$command_line$i|"
done

MAX=${#command_line}
MAX=$(($MAX-1));

# checking the str length to remove the last pipe on regex
# echo $MAX;

command_line=${command_line:0:$MAX}
command_line="$command_line\" $1"

# checking the command to be run
# echo $command_line

output=$(eval "$command_line")
echo "$output";