10-17-2013
Quote:
Originally Posted by
r3d3
@Chubler_XL, @Don Cragun, thank you very much for your help. Both of these scripts worked on the sample I posted. When I tried it on the actual text file I have (about 600K lines, around 300-400 lines between start and end regexs), the scripts are taking a lot of time. Do you have any suggestions on reducing the process time?
What OS are you using? (I.e., what is the output from
uname -a?)
How many different departments are in huge_file.txt?
Is there any chance that start_regexp and end_regexp occur in unmatched pairs? (My code will copy a start_regexp line found between a start_regext and the next end_regexp without restarting a copy, and will ignore an end_regexp if there was no start_regexp since the last seen end_regexp.)
Will there ever be a sequence of lines between the start and end lines that does not contain a
Department=value line?
Answers to the above questions could be used to improve speed with an increased chance of things going wrong if the input data is malformed for some reason.
Expanding on what Chubler_XL said: If your input and output files are on different disk controllers, that might improve performance. If your input files are on one filesystem on a disk drive and your output files are on a different filesystem on the same drive, that will be worse than having the input and output files on the same filesystem.
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g3cat(1) mgetty+sendfax manual g3cat(1)
NAME
g3cat - concatenate multiple g3 documents
SYNOPSIS
g3cat [-l] [-a] g3-file1 ...
DESCRIPTION
g3cat concatenates g3 files. These can either be 'raw', that is, bitmaps packed according to the CCITT T.4 standard for one-dimensional
bitmap encoding, or 'digifax' files, created by GNU's GhostScript package with the digifax drivers. Its output is a concatenation of all
the input files, in raw G3 format, with two white lines in between.
If a - is given as input file, stdin is used.
If the input data is malformed, a warning is printed to stderr, and the output file will have a blank line at this place.
OPTIONS
-l separate files with a one-pixel wide black line.
-h <blank lines>
specifies the number of blank lines g3cat should prepend to each page. Default is 0.
-L <lines>
limit lenght of output page to maximum <lines> lines.
SPECIAL-CASE OPTIONS
-w <width>
specifies the desired page width in pixels per line. Default is 1728 PELs, and this is mandatory if you want to send the fax to a
standard fax machine. If one of the input files doesn't match this line width (for example because it was created by a broken G3
creator), a warning is printed, and the line width is transparently fixed.
-a byte-align the end-of-line codes (EOL) in the file. Every EOL will end at a byte boundary, that is, with a 01 byte.
-p <pad>
specifies a minimum number of bytes that each output line must be padded to. Padding is done with 0-bits before the EOL code.
-R suppress output of end-of-page code (RTC).
Example
The following example will put a header line on a given g3 page, 'page1' and put the result into 'page2':
echo '$header' | pbmtext | pbm2g3 | g3cat - page1 >page2
FILES
--
BUGS
Hopefully none :-).
SEE ALSO
g32pbm(1), sendfax(8), faxspool(1)
AUTHORS
g3cat is Copyright (C) 1993 by Gert Doering, <gert@greenie.muc.de>
greenie 27 Oct 93 g3cat(1)