Linux – How to monitor changes across several files in Linux

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I want to monitor changes across several log files in Linux. Basically, I want to see which log file gets updated out of a set of 20 files. I have checked multitail tool, but its UI can handle max up to 5 files.

Any help is appreciated.

Best Answer

For what you propose, there's a lot of ways to do that depending on the situation.

Lightweight: Look into inotify

More fixtured (daemon): fam (File Alteration Monitor)

Or if it's not a common thing you'll be doing:

Or for a one off: watch -d -n 1 ls -t in the directory you want to watch (only in a flat directory, not recursive but you could modify it to do so) - then run tail on the result.

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Linux Hard Disk Load – How to Monitor Hard Disk Load on Linux

You can get a pretty good measure of this using the iostat tool.

% iostat -dx /dev/sda 5

Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.78    11.03    1.19    2.82    72.98   111.07    45.80     0.13   32.78   1.60   0.64

The disk utilisation is listed in the last column. This is defined as

Percentage of CPU time during which I/O requests were issued to the device (band-width utilization for the device). Device saturation occurs when this value is close to 100%.

Linux – Monitor multiple Linux log files in real time

Since there is only one job active at a time, completed job logs are moved to /joblogs/completed_jobs/job_* and the logs are short, this hokey workaround is OK for now:

while [ 1 == 1 ] ; do for joblog in `ls /joblogs/job_*/JOB.LOG`; do cat $joblog; done; sleep 10; done

Best Answer

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