Linux awk bigger or less than 2018-05-14 06:45
Let's say you have a file which contains log content. awk command can help you split every line of it and print the field you care about. awk can do more than this. Let's say your log file might look like this.
INFO 2018-04-27 00:00:00 version=2.5.3 time_cost=10
INFO 2018-04-27 00:00:00 version=2.5.3 time_cost=18
INFO 2018-04-27 00:00:01 version=2.5.2 time_cost=39
INFO 2018-04-27 00:00:01 version=2.5.2 time_cost=8
INFO 2018-04-27 00:00:14 version=2.5.3 time_cost=94
INFO 2018-04-27 00:00:14 version=2.5.3 time_cost=106
INFO 2018-04-27 00:00:26 version=2.5.2 time_cost=83
INFO 2018-04-27 00:00:26 version=2.5.2 time_cost=37
INFO 2018-04-27 00:00:30 version=2.5.3 time_cost=58
You can only print time_cost field by using following command.
[henry@virtual ~]$ cat log_file |awk '{print$5}'
time_cost=10
time_cost=18
time_cost=39
time_cost=8
time_cost=94
time_cost=106
time_cost=83
time_cost=37
time_cost=58
Print the time cost bigger than 50.
[henry@virtual ~]$ cat log_file |awk -F 'time_cost=' '$2>50 {print}'
INFO 2018-04-27 00:00:14 version=2.5.3 time_cost=94
INFO 2018-04-27 00:00:14 version=2.5.3 time_cost=106
INFO 2018-04-27 00:00:26 version=2.5.2 time_cost=83
INFO 2018-04-27 00:00:30 version=2.5.3 time_cost=58
Print the time cost less than 50.
[henry@virtual ~]$ cat log_file |awk -F 'time_cost=' '$2<50 {print}'
INFO 2018-04-27 00:00:00 version=2.5.3 time_cost=10
INFO 2018-04-27 00:00:00 version=2.5.3 time_cost=18
INFO 2018-04-27 00:00:01 version=2.5.2 time_cost=39
INFO 2018-04-27 00:00:01 version=2.5.2 time_cost=8
INFO 2018-04-27 00:00:26 version=2.5.2 time_cost=37
Print the time cost bigger than 50 and less than 100.
[henry@virtual ~]$ cat log_file |awk -F 'time_cost=' '$2>50 && $2<100 {print}'
INFO 2018-04-27 00:00:14 version=2.5.3 time_cost=94
INFO 2018-04-27 00:00:26 version=2.5.2 time_cost=83
INFO 2018-04-27 00:00:30 version=2.5.3 time_cost=58
EOF