LinuxQuestions.org - tail -f utilization

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- - tail -f utilization (https://www.linuxquestions.org/questions/linux-general-1/tail-f-utilization-564362/)

Code:

schiwalj@FAR_ADSDT1 ~

$ cat testdata

Date: 6/26/07 1:33:14 PM

LogName: NAME1

Logtype: TYPE1

LogUser: USER1

LogClient: CLIENT1

LogServer: SERVER1

LogLife: LIFE1

LogContent: CONTENT1

--

Date: 6/26/07 1:33:15 PM

LogName: NAME2

Logtype: TYPE2

LogUser: USER2

LogClient: CLIENT2

LogServer: SERVER2

LogLife: LIFE2

LogContent: CONTENT2

--

Date: 6/26/07 1:33:16 PM

LogName: NAME3

Logtype: TYPE3

LogUser: USER3

LogClient: CLIENT3

LogServer: SERVER3

LogLife: LIFE3

LogContent: CONTENT3

--

schiwalj@FAR_ADSDT1 ~

$ cat td.sed

#n

/Date:/,/--/{

              /Date:/H

              /Logtype:/H

              /LogUser:/H

              /--/{ x

                    s/^--//

                    s/^\n//

                    s/\n/ - /gp

                  }

            }





schiwalj@FAR_ADSDT1 ~

$ sed -f td.sed testdata

Date: 6/26/07 1:33:14 PM - Logtype: TYPE1 - LogUser: USER1

Date: 6/26/07 1:33:15 PM - Logtype: TYPE2 - LogUser: USER2

Date: 6/26/07 1:33:16 PM - Logtype: TYPE3 - LogUser: USER3

I'd have to break out my sed & awk book to improve on this. When I tried the 'g' instead of the 'x' command, it didn't work right, so I needed to eliminate the '--' added back to the buffer.

good morning!

i tried your scripts and i've a question regarding 'Agrouf' suggestion:

my logfile is filled every minute (every minute the application takes data from db and fills logfile)
it seems that 'Agrouf' script works good only for the first filling, then it stops...

do you know why?

thanks.

I suspect it because of EOF.
It is probably because the program writing to the log files closes it every time it has written to it (every minutes that is).
It would be strange because I don't think that would stop tail.
Can you try tail with -F instead of -f please?

Quote:

Originally Posted by mfran2002

it seems that 'Agrouf' script works good only for the first filling, then it stops...

do you know why?

Can you post the real script you use ?

Also, I mentioned earlier you would have buffering issues. That may be the case here.