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Full Discussion: sed hanging
Top Forums Shell Programming and Scripting sed hanging Post 302756853 by SkySmart on Wednesday 16th of January 2013 03:06:47 PM
Old 01-16-2013
sed hanging

Code:
/bin/sed -n '$q;5633653,0 p' lfile

lfile is a log file that is being updated several times a second.

so, the command above figures out the line number it wants in the lfile and then proceeds to output all lines from that line number to the end of the file.

the problem is, the end of the file is not known because, as i said, the log file gets updated with many more lines every second.

so if the sed command figures out there are 5650000 lines in lfile right now, when it starts running the above command, and while running it, there are no longer 5650000 lines anymore in the lfile. that number has increased. so the sed command hangs.

is there a better way to run the above command?
 

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PAPS(1) 						      General Commands Manual							   PAPS(1)

NAME
paps - UTF-8 to PostScript converter using Pango SYNOPSIS
paps [options] files... DESCRIPTION
paps reads a UTF-8 encoded file and generates a PostScript language rendering of the file. The rendering is done by creating outline curves through the pango ft2 backend. OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included below. --landscape Landscape output. Default is portrait. --columns=cl Number of columns output. Default is 1. --font=desc Set the font description. Default is Monospace 12. --rtl Do rtl layout. --paper ps Choose paper size. Known paper sizes are legal, letter, a4. Default is A4. --bottom-margin=bm Set bottom margin in postscript points (1/72 inch). Default is 36. --top-margin=tm Set top margin. Default is 36. --left-margin=lm Set left margin. Default is 36. --right-margin=rm Set right margin. Default is 36. --help Show summary of options. --header Draw page header for each page. --markup Interpret the text as pango markup. --encoding=ENCODING Assume the documentation encoding is ENCODING. --lpi Set the lines per inch. This determines the line spacing. --cpi Set the characters per inch. This is an alternative method of specifying the font size. --stretch-chars Indicates that characters should be stretched in the y-direction to fill up their vertical space. This is similar to the texttops behaviour. AUTHOR
paps was written by Dov Grobgeld <dov.grobgeld@gmail.com>. This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others). April 17, 2006 PAPS(1)
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