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Full Discussion: updates only
Top Forums Shell Programming and Scripting updates only Post 302283339 by otheus on Tuesday 3rd of February 2009 05:44:30 AM
Old 02-03-2009
Can the file change anywhere? Or can lines only be added to it? If lines can only be added to it, just keep track of the last line number:
Code:
wc -l <filename> >/root/lastcheck-line.dat

Then a while later, do:
Code:
read L </root/lastcheck-line.dat
awk "NR==$L,0" <filename>  >/root/temp.txt

Once you're done, you can print the length again. You can do it altogether this way:
Code:
L=1; test -s /root/lastcheck-line.dat && read L </root/lastcheck-line.dat
awk "NR==$L,0 { print } END { print NR >'/root/lastcheck-line.dat' }" <filename>  >/root/temp.txt

 

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LEARN ABOUT DEBIAN

ohcount

OHCOUNT(1)							   User Commands							OHCOUNT(1)

NAME

       ohcount - manual page for ohcount 3.0.0

SYNOPSIS

       ohcount [option] [paths...]

DESCRIPTION

       Ohloh source code line counter command line tool.

	      http://www.ohloh.net/

   [option] can be one of the following:
       -a, --annotate

       -d, --detect

       -h, --help

       -i, --individual

       -l, --license

       -re

       -s, --summary

       -a, --annotate		       Show annotated source code

	      The  contents  of  all  source  code files found within the given paths will be emitted to stdout. Each line will be prefixed with a
	      tab-delimited language name and semantic categorization (code, comment, or blank).

       -d, --detect		       Find source code files

	      Recursively find all source code files within the given paths.  For each source code file found, the file name will  be  emitted	to
	      stdout prefixed with a tab-delimited language name.

       -h, --help		       Display this message

       -i, --individual 	       Count lines of code per file

	      Count  lines  in	all source code files within the given paths, and emit a report of the lines of code, comments, and blanks in each
	      language per file.

       -l, --license

	      Displays detected licensing information contained in each source code file.

       -re

	      Prints raw entity information to the screen (mainly for debugging).

       -s, --summary		       Count lines of code (default)

	      Count lines in all source code files within the given paths, and emit a report of the total number of lines of code,  comments,  and
	      blanks in each language. This is the default action.

       [paths] can refer to any number of individual files or directories.

	      Directories will be probed recursively. If no path is given, the current directory will be used.

ohcount 3.0.0							  September 2011							OHCOUNT(1)
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