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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 ULTRIX

setregid

setregid(2)							System Calls Manual						       setregid(2)

Name
       setregid - set real and effective group ID

Syntax
       setregid(rgid, egid)
       int rgid, egid;

Description
       The real and effective group ID's of the current process are set to the arguments.

       Supplying a value of -1 for either the real or effective group ID forces the system to substitute the current ID for the -1 parameter.

Environment
       BSD
       If  the	process is superuser, or and matches with the real group ID, the effective group ID, or the saved set-group-id (as described in ),
       then the real, effective, and saved set-group-id are set to and respectively.

       POSIX
       SYSTEM-FIVE
       When your program is compiled in POSIX or SYSTEM-FIVE mode, the following semantics apply when using the function.

       If the process is the superuser, the real, effective, and saved set-group-id (as described in ) are set to and respectively.

       If the process is not the superuser, but the and matches the real group ID, the effective group ID (only in SYSTEM-FIVE	and  BSD  environ-
       ment), or the saved set-group-id, then the effective ID is set to The real group ID and the saved set-group-id are left unchanged.

Return Values
       Upon successful completion, a value of zero (0) is returned.  Otherwise, a value of -1 is returned, and errno is set to indicate the error.

Diagnostics
       [EPERM]	      The  current process is not the superuser and the and specified does not match with the real group ID or the effective group
		      ID (only in SYSTEM-FIVE and BSD environment) or the saved set-group-id.

See Also
       getgid(2), setreuid(2), setgid(3)

																       setregid(2)
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