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Full Discussion: trying to grep the first few lines of a continuos script, and exit the script anyidea
Top Forums UNIX for Dummies Questions & Answers trying to grep the first few lines of a continuos script, and exit the script anyidea Post 302336555 by drewrockshard on Wednesday 22nd of July 2009 11:07:54 AM
Old 07-22-2009
Grep is a search utility. Obviously, you can use it to return results from a file to text, and I use it for this from time to time. However, I believe you can go at this in a different way, that will be a solution to your issue. I would do the following:

Code:
tail -n 20 >> output.txt

This will output the last 20 lines that are currently written to the continuously written log file, and outputs the data to a text file. The example above appends to the file (does not overwrite). If you want it to overwrite:

Code:
tail -n 20 > output.txt

Let me know if you have any questions.
 

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LEARN ABOUT SUNOS

parse_dynamic_clustertoc

parse_dynamic_clustertoc(1M)				  System Administration Commands			      parse_dynamic_clustertoc(1M)

NAME

       parse_dynamic_clustertoc - parse clustertoc file based on dynamic entries

SYNOPSIS

       cdrom/export/exec/sparc.Solaris_2.x/sbin/install.d/parse_dynamic_clustertoc

       cdrom/export/exec/i386.Solaris_2.x/sbin/install.d/parse_dynamic_clustertoc

DESCRIPTION

       This script parses the  clustertoc file before the suninstall(1M) process is run.  parse_dynamic_clustertoc is called by a modified syscon-
       fig script on the install CD.  When parse_dynamic_clustertoc runs, it reads the clustertoc and when it encounters SUNW_CSRMBRIFF lines,	it
       either  checks  the  platform  using the script's builtin function, or calls an external script.  The script exits with	a 0 if the cluster
       entry is included,  otherwise it will be ignored.  If the cluster entry is to be included, the SUNW_CSRMBRIFF =(test test_arg)cluster  line
       is converted to SUNW_CSRMEMBER =cluster.

EXAMPLES

       Example 1: Checking For an SX Framebuffer

       The  following is an example of a simple external test to check for an SX Framebuffer.  The entry in the  clustertoc file is shown and fol-
       lowing that is the script that must be placed in the  install.d/dynamic_test directory.

       SUNW_CSRMBRIFF=(smcc.dctoc sx)SUNWCsx
       #! /bin/sh
       #
       # Likewise, this file is expected to live under $(TESTDIR).
       #
       case "$1"
       in
	       sx)     prtconf -p  | grep 'SUNW,sx' 1> /dev/null;;
       esac

FILES

       cdrom/Solaris_2.x/locale/C/.clustertoc.dynamic

	   Dynamic version of the  clustertoc file

       cdrom/export/exec/sparc.Solaris_2.x/sbin/install.d/dynamic_test

	   Directory that contains any additional tests

       cdrom/export/exec/i386.Solaris_2.x/sbin/install.d/dynamic_test

	   Directory that contains any additional tests

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SHWPcdrom (Solaris CD)	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       suninstall(1M), clustertoc(4), attributes(5)

SunOS 5.10							    6 Sep 1995					      parse_dynamic_clustertoc(1M)
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