On Sun, Sep 22, 2024 at 19:56 (+0000), dep via tde-users wrote:
> Some months ago I asked here if there were a way to log my ISP's downtime,
> and got a useful answer. Today I've been attempting to refine it a bit,
> and there is some progress, but not success.
> Here's what I have:
> [code]
> #!/bin/bash
> #monitor frontier communications downtime
> ping -i 3 -O -D 1.1.1.1 | while read row
> do
> awk '{ sub(/[0-9]{10}/, strftime("%Y-%m-%d %H:%M:%S", substr($0,2,10))) }
> 1' <<< "$row"| tee ~/frontier_downtime.log
> done
> [/code]
> Most of it is simply converting internet time to human time, because I
> might have to use it to support a complaint. It runs fine in a terminal, a
> nice ping and result every three seconds, but only writes the first line,
> the first ping result, to the logfile. (And yes, ir's probably sloppy.)
I don't think that is true. I think it is writing the most recent ping
result to the log file.
> What do I have wrong?
You didn't use the '-a' option to tee. So each invocation of tee
over-writes the file with the most recent line.
I might suggest something like
ping -i 3 -O -D 1.1.1.1 | while read row
do
awk '{ sub(/[0-9]{10}/, strftime("%Y-%m-%d %H:%M:%S", substr($0,2,10))) }
1' <<< "$row"
done | tee -a ~/frontier_downtime.log
to avoid calling a new invocation of tee for every ping result.
> Bonus question: any way to keep it running with the terminal closed? I
> can't even use & to free the terminal; I'd like to start the thing and
> have it cook merrrily away without a terminal open or even minimized, and
> use top or killall to dispose of it if that becomes necessary.
> I'm pretty sure I'm missing something obvious.
I think maybe you are.
touch ~/frontier_downtime.log
ping -i 3 -O -D 1.1.1.1 | while read row
do
awk '{ sub(/[0-9]{10}/, strftime("%Y-%m-%d %H:%M:%S", substr($0,2,10))) }
1' <<< "$row"
done >> ~/frontier_downtime.log &
You should be able to close that terminal after running that without
anything bad happening. And if you want to see that is going on from some
terminal, you can use
tail -f ~/frontier_downtime.log
in that terminal.
Cheers.
Jim
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