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Full Discussion: Capping output redirection log file length
Top Forums UNIX for Dummies Questions & Answers Capping output redirection log file length Post 302361532 by joemommasfat on Tuesday 13th of October 2009 12:05:26 PM
Old 10-13-2009
Thanks,

I'm not sure if it's a bug in the router OS or if this is true all of the time, but apparently sometimes this method works and sometimes it overwrites the original file with only the last entry. A (less than elegant) method I've found that will work is:

Code:
log_clip () {
 echo "$1" | cat "$2" - | tail -n 100 > $pwd/temp
 mv $pwd/temp "$2"
}

However I feel there must be a more elegant way to avoid temporary files using awk or sed, but I'm just not that familiar with them. Can someone help appease the OCD perfectionist in me?
 

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LEARN ABOUT DEBIAN

jfs_fscklog

jfs_fscklog(8)						   Extract/Display JFS fsck Log 					    jfs_fscklog(8)

NAME

       jfs_fscklog - extract a JFS fsck service log into a file and/or format and display the extracted file

SYNOPSIS

       jfs_fscklog [ -d ] [ -e device ] [ -f output.file ] [ -p ] [ -V ]

DESCRIPTION

       jfs_fscklog  with option -e device extracts the contents of either the most recent or immediately prior (specified with option -p) JFS fsck
       service log from the specified device, and writes the output to a file.	The file name may be specified with the -f option, or the  default
       file name is <pwd>fscklog.new.  If the -p option is used, the default file name is <pwd>fscklog.old.

       jfs_fscklog with option -d formats and displays the contents of the extracted file.

       jfs_fscklog with options -d and -e device extracts and displays the JFS fsck service log.

OPTIONS

       -d     Format and display a previously extracted JFS fsck service log.

       -e device
	      Extract  the  JFS fsck service log from device and store it in a file.  (device is the special file name corresponding to the actual
	      device from which the fsck log will be extracted (e.g.  /dev/hdb1 )).

       -f file.name
	      Specify the file name, overriding the default file name.	When used with -e device, file.name specifies the name of  the	file  into
	      which the JFS fsck log will be extracted.  When used with -d, file.name specifies the name of the extracted file whose contents will
	      be formatted and displayed.

	      file.name must be 127 characters or less in length.

	      file.name will be created in the present working directory unless it is fully qualified.

       -p     Extract the prior log (as opposed to the most recent log).

       -V     Print version information and exit (regardless of any other chosen options).

EXAMPLES

	Extract the most recent JFS fsck log on /dev/hda5 into <pwd>fscklog.new:

	      jfs_fscklog -e /dev/hda5

       Extract the most recent JFS fsck log on /dev/hdb3 into /temp/l9651107.log:

	      jfs_fscklog -e /dev/hdb3 -f /temp/l9651107.log

       Display the JFS fsck log that was extracted into /temp/l9651107.log:

	      jfs_fscklog -d -f /temp/l9651107.log

       Extract and display the previous JFS fsck log from /dev/hda8:

	      jfs_fscklog -e /dev/hda8 -d -p

REPORTING BUGS

       If you find a bug in JFS or jfs_fscklog, please report it via the bug tracking system ("Report Bugs" section) of the JFS project web site:
       http://jfs.sourceforge.net/

       Please send as much pertinent information as possible, including any jfs_fscklog error messages and the complete output of running jfs_fsck
       with the -v option on the JFS device.

SEE ALSO

       jfs_fsck(8), jfs_mkfs(8), jfs_tune(8), jfs_logdump(8), jfs_debugfs(8)

AUTHOR

       Barry Arndt  (barndt@us.ibm.com)

       jfs_fscklog is maintained by IBM.
       See the JFS project web site for more details:
       http://jfs.sourceforge.net/

								 October 28, 2002						    jfs_fscklog(8)
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