Mailinglist Archive: opensuse (1986 mails)

["Brian K. White" <brian@xxxxxxxxx>]

----- Original Message ----- 
From: "Randall R Schulz" <rschulz@xxxxxxxxx>
To: <opensuse@xxxxxxxxxxxx>
Sent: Thursday, November 20, 2008 7:41 PM
Subject: Re: [opensuse] Attempting (and succeeding) to use my UPS


> On Thursday 20 November 2008 16:30, Carlos E. R. wrote:
> > On Thursday, 2008-11-20 at 18:03 -0500, Patrick Shanahan wrote:
> > > > Of course, the root problem is why is it so slow. Can you imagine
> > > > a one minute delay on every boot?
> > >
> > > That is *wierd* :^).  It must be the ups unit is slow to
> > > communicate.
> >
> > No, not that. Once it gets going it prints a message about every five
> > seconds, if you start the driver on console. response to commands is
> > fast. It must be one of the commands or initial tests that fail. I'll
> > think that out some other day.
> >
> > Do you know of a pipe program that precedes every line with a time
> > stamp?
>
> No such thing exists, nor is it even remotely possible...
>
> Still...
>
> tstamp:
>
> -==--==--==--==--==--==--==--==--==--==--==--==--==--==--==-
> #!/bin/bash --norc
>
>    tsFormat='%F_%H.%M.%S'
>
>    IFS=
>    while read line; do
>        echo "$(date +"$tsFormat: $line")"
>    done
> -==--==--==--==--==--==--==--==--==--==--==--==--==--==--==-
>
> Adjust the tsFormat variable to create the time-stamp you want. 
> The "date" command has many, many options. Check the help output or the 
> man page.

Unecessary sub-shell spwan.
I don't see the point in unsetting IFS either.
And I'm not sure putting the format string into a variable actually simplifies 
things.

I end up with just one line and no spawned child shell.

---top---
#!/bin/bash --norc

while read ;do date "+%F_%H.%M.%S: $REPLY" ;done
---end---


Though really I would suggest this in order to handle the last line of input if 
input ends without a final linefeed.

---top---
#!/bin/bash --norc

DONE=false
until $DONE ;do
        read || DONE=true
        date "+%Y%m%d%H%M%S: $REPLY"
done
---end---



Except, even better than that, why run the date command over and over when 
other scripting languages have a date call built-in. Now we really only have 
one process, not even a shell plus date starting and exiting over and over, we 
just have one single awk:

awk '{print strftime("%Y%m%d%H%M%S: ")$0}'

or

---top---
#!/usr/bin/awk -f
{
    print strftime("%Y%m%d%H%M%S: ")$0
}
---end---


There is also the logger command which does this already if you
don't mind the output going to syslog or to a file configured by
syslog.conf

-- 
Brian K. White    brian@xxxxxxxxx    http://www.myspace.com/KEYofR
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