📺 https://youtu.be/onwLxlu7Q4g
I used to love changing the name of a running Perl daemon (service) to
show what it was processing — especially if more than one forked
process was working on it. Each child could update what appears in ps
-ef output to show the current state and file it was working on. That
is hugely valuable in operations and systems programming. Here’s what
the code looks like in Perl.
#!/usr/bin/perl
$count=1;
while (true) {
$0="foo: $count";
sleep 1;
$count++;
}
However, such is not possible in Bash, despite the description of
$BASH_ARGV0 which suggests this is possible. Perhaps $0 is changed,
but not the value of /proc/pid/cmdline, which is what appears in the ps
-ef output.
We found some Go code to do similar things, but it requires CGO to be on.
References:
https://github.com/erikdubbelboer/gspt
#unix #linux #sre #devops #tips #coding #perl #golang #c