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Full Discussion: sed / grep / for statement performance - please help
Top Forums Shell Programming and Scripting sed / grep / for statement performance - please help Post 302368350 by TehOne on Wednesday 4th of November 2009 04:41:10 PM
Old 11-04-2009
Error sed / grep / for statement performance - please help
I'm searching the most effective way of doing the following task, so if someone can either provide a working solution with sed or one totally different but more effective then what I've got so far then please go ahead!

The debugme directory has 3 subdirectorys and each of them has one .txt file with about 48 entrys each.

Code:
time (
for FILE1 in `find debugme -name "*.txt"` ;do
    for FILE2 in `cat "$FILE1" | awk '{print $1}' | grep -i '^\([0-9]\+\)$'` ;do
    #for FILE2 in `sed 's/\([0-9]\+\) \([a-zA-Z0-9]\+\)/\1/i' "$FILE"` ;do
        CHECK=`grep "$FILE2" "debug.files"`
        if [ "$CHECK" = "" ]; then
            ## ADD MISSING ENTRY BLABLA
            echo "$FILE2 was missing, added!"
        fi
    done
done
)

Avg result:
real    0m0.174s
user    0m0.052s
sys     0m0.128s

time (
for FILE1 in `find debugme -name "*.txt"` ;do
    FILE2() {
        S=`grep $1 debug.files`
        if [ "$S" = "" ] ; then
            ## ADD MISSING ENTRY BLABLA
            echo "$FILE2 was missing, added!"
        fi
    }
    while read cola colb ; do
        $(FILE2 $cola)
    done < $FILE1
done
)

Avg result:
real    0m0.269s
user    0m0.064s
sys     0m0.228s

The .txt files are in this format:

Code:
[03:53:22] root:~# cat example.txt
52352578 ABF2778ABD^
73534536 LASDM337lA^
83523422 JFAASMM31^

And debug.files in this:

Code:
[03:53:25] root:~# cat debug.files
52352578
73534536

 

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LEARN ABOUT DEBIAN

comm

COMM(1) 							   User Commands							   COMM(1)

NAME

       comm - compare two sorted files line by line

SYNOPSIS

       comm [OPTION]... FILE1 FILE2

DESCRIPTION

       Compare sorted files FILE1 and FILE2 line by line.

       With  no  options,  produce three-column output.  Column one contains lines unique to FILE1, column two contains lines unique to FILE2, and
       column three contains lines common to both files.

       -1     suppress column 1 (lines unique to FILE1)

       -2     suppress column 2 (lines unique to FILE2)

       -3     suppress column 3 (lines that appear in both files)

       --check-order
	      check that the input is correctly sorted, even if all input lines are pairable

       --nocheck-order
	      do not check that the input is correctly sorted

       --output-delimiter=STR
	      separate columns with STR

       --help display this help and exit

       --version
	      output version information and exit

       Note, comparisons honor the rules specified by `LC_COLLATE'.

EXAMPLES

       comm -12 file1 file2
	      Print only lines present in both file1 and file2.

       comm -3 file1 file2
	      Print lines in file1 not in file2, and vice versa.

AUTHOR

       Written by Richard M. Stallman and David MacKenzie.

REPORTING BUGS

       Report comm bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report comm translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  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

       join(1), uniq(1)

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

	      info coreutils 'comm invocation'

       should give you access to the complete manual.

GNU coreutils 8.12.197-032bb					  September 2011							   COMM(1)
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