Bash script search, improve performance with large files Post: 303033258

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Top Forums Shell Programming and Scripting Bash script search, improve performance with large files Post 303033258 by SDohmen on Tuesday 2nd of April 2019 08:11:57 AM

04-02-2019

Registered User

Quote:

Originally Posted by RudiC

You might want to build an "alternation regex", with not too many keywords, and modify the matching slightly. Compare performance of

Code:

awk '
NR==FNR                 {SRCH=SRCH DL $0
                         DL = "|"
                         next
                        }
tolower($0) ~ SRCH      {print > "'"$PAD/removed_woord.csv"'"
                         next
                        }

                        {print > "'"$PAD/filtered_winnaar_2.csv"'"
                        }
' file3 file4 

real    0m2,328s
user    0m2,318s
sys    0m0,005s

to this

Code:

time awk '
NR==FNR         {id[$0]
                 next
                }
                {for (SP in id) if (tolower($0) ~ SP)    {print > "'"$PAD/removed_woord.csv"'"
                                                 next
                                                }
                }
                {print > "'"$PAD/filtered_winnaar_2.csv"'"
                }
' file3 file4
real    0m17,038s
user    0m16,995s
sys    0m0,025s

seems to make a factor of roughly 7. The output seems to be identical. Please try and report back.

I just did this one again and i got it working. I noticed the -F";" was missing so i added that and it worked flawlessly. The complete script runs in about 20 sec now which was more then 7 min first.

SDohmen

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rec2csv

REC2CSV(1)							   User Commands							REC2CSV(1)

NAME

       rec2csv - rec to csv converter

SYNOPSIS

       rec2csv [OPTIONS]... [REC_FILE]

DESCRIPTION

       Convert rec data into csv data.

       -t, --type=TYPE
	      record set to convert to csv; if this parameter is omitted then the default record set is used

       -S, --sort=FIELD
	      sort the output by the specified field.

       --help print a help message and exit.

       --version
	      show version and exit.

AUTHOR

       Written by Jose E. Marchesi.

REPORTING BUGS

       Report bugs to: bug-recutils@gnu.org
       GNU recutils home page: <http://www.gnu.org/software/recutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2010, 2011, 2012 Jose E. Marchesi.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The  full  documentation  for  rec2csv  is maintained as a Texinfo manual.  If the info and rec2csv programs are properly installed at your
       site, the command

	      info rec2csv

       should give you access to the complete manual.

rec2csv 1.4.93							   January 2012 							REC2CSV(1)