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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 CENTOS

sgml2txt

SGML2TXT(1)						      General Commands Manual						       SGML2TXT(1)

NAME

       sgml2txt - create plain text output from a LinuxDoc DTD SGML source file

SYNOPSIS

       sgml2txt [generic-option...] [--manpage] [--filter] [--blanks=n] file[.sgml]

DESCRIPTION

       sgml2txt  is  an old and obsoleted form of the text converter command of LinuxDoc-Tools.  It is recommended to switch the new form linuxdoc
       -B text now.  It converts a LinuxDoc DTD SGML source file to ASCII, ISO-8859-1, or EUC-JP output. Output will appear in file.txt where file
       is the name of the SGML source file.

       The attribute/value pair "output=txt" is set for conditionals.

OPTIONS

       sgml2txt accepts all the generic options described in linuxdoc(1), and the following specific options:

       --manpage, -m
	      Outputs a groff source file, suitable for formatting with groff -man for man pages

       --filter, -f
	      Remove backspace-overstrikes from the intermediate form generated by groff(1).

       --pass, -P
	      The argument of the pass option is added to the command-line options handed to groff(1).

       --blanks=n, -b
	      Set  the	limit of continuous blank lines for generating the output document.  The default limit is 3. if 0 (zero) is specified, the
	      result have many continuous blank lines.

       file   The SGML source file, named either file or file.sgml

FILES

       Many files and executables in /usr/share/linuxdoc-tools are used.

BUGS

       None known.

AUTHOR

       Originally written by Greg Hankins <greg.hankins@cc.gatech.edu>, based on scripts by Tom Gordon and Alexander Horz, and later rewritten	by
       Cees de Groot <cg@cdegroot.com> for SGML-Tools (v1).  Currently maintained by Taketoshi Sano <sano@debian.org> for Linuxdoc-Tools.

SEE ALSO

       linuxdoc(1), sgml2html(1), sgml2info(1), sgml2latex(1), sgml2lyx(1), sgml2rtf(1), sgmlcheck(1).

								    16 May 2000 						       SGML2TXT(1)
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