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Full Discussion: BASH logging to file, limit lines
Top Forums Shell Programming and Scripting BASH logging to file, limit lines Post 303002698 by scorpius2k1 on Wednesday 30th of August 2017 09:17:45 PM
Old 08-30-2017
Quote:
Originally Posted by Don Cragun
Assuming that log.txt contains 20 lines of text when you start the following script:
Code:
netcat -ul -p 53 | while IFS='' read -r line
do	sed 1d log.txt > _log.txt
	{ cat _log.txt; printf '%s\n' "$line"; } > log.txt
done

might come close to doing what you want.
I am very grateful for your reply, that did it perfectly! I simply used a
Code:
LINECOUNT=$(wc -l < "log.txt")

to grab the number of lines in the file and put on space in any remaining. Easy enough to parse out the spaces and display data

I cannot thank you enough Don, many, MANY thanks! SmilieSmilieSmilie
 

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LEARN ABOUT MOJAVE

monitor

monitor(1)                                                        monitor command                                                       monitor(1)

NAME

       monitor - receive logging information from LPD

SYNOPSIS

       monitor [ -u ] [ -t ] [ port ]

DESCRIPTION

       The  monitor  program is a template for a printer status monitoring program.  It will open the specified TCP and/or UDP port, and then wait
       for accounting or other information to be sent.  It prints this information on it standard output.

OPTIONS

       -u   wait for connections on the UDP port.

       -t   wait for connections on the TCP port.

       port Use the specified port number.

EXIT STATUS

       The following exit values are returned:

       zero (0)       Successful completion.

       non-zero (!=0) An error occurred.

SEE ALSO

       lpd.conf(5), lpc(8), lpd(8), checkpc(8), lpr(1), lpq(1), lprm(1), printcap(5), lpd.conf(5), pr(1), lprng_certs(1), lprng_index_certs(1).

AUTHOR

       Patrick Powell <papowell@lprng.com>.

HISTORY

       LPRng is a enhanced printer spooler system with functionality similar to the Berkeley LPR software.  The LPRng developer  mailing  list  is
       lprng-devel@lists.sourceforge.net; subscribe by visiting https://lists.sourceforge.net/lists/listinfo/lprng-devel or sending mail to lprng-
       request@lists.sourceforge.net with the word subscribe in the body.
       The software is available via http://lprng.sourceforge.net

LPRng                                                               2006-12-09                                                          monitor(1)
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