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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 303002696 by Don Cragun on Wednesday 30th of August 2017 08:08:40 PM
Old 08-30-2017
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.
This User Gave Thanks to Don Cragun For This Post:
scorpius2k1
 

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LEARN ABOUT DEBIAN

bntext

bntext(5)							File Formats Manual							 bntext(5)

NAME

       bnmotd.txt, bnnews.txt bnissue.txt - messages for the Unix Battle.net daemon

DESCRIPTION

       The file bnmotd.txt contains text displayed by bnetd(1), when users first log into the server.

       The file bnnews.txt contains text displayed when the user uses the /news chat command.

       The  files  consist  of raw text with printf-style formatting escapes.  Each line of a file can contain a type formatter from the following
       list:

	      %B     Use the broadcast attribute (???).

	      %C     Execute the line as if the user entered it as a command.

	      %E     Use the error attribute (red).

	      %I     Use the info attribute (yellow).  This is the same was %W.

	      %M     Normal chat message (white).  This will appear as if the user said it.

	      %T     Emote chat message (???).	This will appear as if the user said it.

	      %W     Use the warning attribute (yellow).  This is the same was %I.

       Within a line, any of the following format formatters may be used:

	      %%     Expand to a literal percent sign (%).

	      %a     Expand to the number of accounts on the server.

	      %c     Expand to the number of channels on the server.  This includes all permanent and current temporary channels.

	      %g     Expand to the number of games on the server.  This includes both public and private (passworded) games.

	      %h     Expand to the hostname of the server (as returned by gethostname(2)).

	      %i     Expand to this user's account ID number, formatted with a leading pound (#) sign and leading zeros.

	      %l     Expand to this user's current chat name which is usually the same

	      %r     Expand to the IP of the remote machine (the client).

	      %t     Expand to four character client tag.

	      %u     Expand to the number of users logged into the server.

	      %v     Expand to the version number of the server.

SEE ALSO

       bnetd(1)

AUTHOR

       Ross Combs (ross@bnetd.org)

								  2 August, 2001							 bntext(5)
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