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Full Discussion: Alternative for wc -l
Top Forums Shell Programming and Scripting Alternative for wc -l Post 302463040 by DGPickett on Friday 15th of October 2010 02:21:25 PM
Old 10-15-2010
Lines can occur at any byte, so brute force is it, and a hybrid approach is needed:
  1. capture the nominal file size using ls -l or the like.
  2. use head -c size <file |wc -l to find the line count to that byte count, even if the file has grown since ls -l.
  3. Report the total.
  4. Save both.
  5. Next time, capture the nominal file size using ls -l or the like.
  6. Calculate the size delta.
  7. use tail -c +old_size <file | head -c delta | wc -l to count just the new lines to that byte count, even if the file has grown since ls -l.
  8. Add the new lines to the past lines.
  9. report the total.
  10. Save the new size and total lines for the next time.

Seeks by byte count are fast.
 

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LEARN ABOUT DEBIAN

evtest-capture

EVTEST-CAPTURE(1)														 EVTEST-CAPTURE(1)

NAME

       evtest-capture - Input device event capture program

SYNOPSIS

       evtest-capture "/dev/input/eventX" [evtest-capture.xml]

DESCRIPTION

       evtest-capture captures the information and events from the input device specified on the command line and writes it to the xml file given.
       If no filename is given for the output file, evtest-capture.xml is chosen as default.

       evtest-capture needs to be able to read from the device; in most cases this means it must be run as root.

       Together with with evtest-create-device.xsl, a simple uinput-based software input device can be created that replays the events as if the
       same input was performed on the physical device. This can be useful to replicate bugs with input devices in upper layers of the stack.

       To convert evtest-capture.xml into such a uinput device, run:

	   xsltproc evtest-create-device.xls evtest-capture.xml > mydevice.c
	   gcc -o mydevice mydevice.c
	   ./mydevice

DIAGNOSTICS

       If evtest-capture does not see any events even though the device is being used, the device may be grabbed by a process (EVIOCGRAB). This is
       usually the case when debugging a synaptics device from within X. VT switching to a TTY or shutting down the X server terminates this grab
       and synaptics devices can be debugged.

SEE ALSO

       evtest(1)

AUTHOR

       evtest-capture was written by Peter Hutterer <peter.hutterer@redhat.com[1]>.

NOTES

	1. peter.hutterer@redhat.com
	   mailto:peter.hutterer@redhat.com

								    05/21/2012							 EVTEST-CAPTURE(1)
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