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Full Discussion: Make script faster
Top Forums Shell Programming and Scripting Make script faster Post 302584105 by Franklin52 on Thursday 22nd of December 2011 07:19:03 AM
Old 12-22-2011
Quote:
Originally Posted by rbatte1
You spend lots of time looping round and demanding in cut again & again. Each time, you start a new process so the system spends effort there. The awk answer is probably the way to go if you are comfortable, however you can simplify you script by using the read statement better:-
Code:
cat $line | while read first second third rest; do  ## Reads each line into separate variables
   if [ "$third" == "27" ]; then  // ## If column == "27" prints column 2. 
        echo $second; 
   fi; 
done;

I did an "Ask Jeeves" search with +bash +read specified and got quite a few examples.

As for the time command, have a read of the man page. The main figure though is real as this will be the elapsed time you will experience.


I hope that this helps.



Robin
Liverpool/Blackburn
UK
Useless Use of Cat, this is suffice:

Code:
while read first second third rest; do  ## Reads each line into separate variables
   if [ "$third" == "27" ]; then  // ## If column == "27" prints column 2. 
        echo $second; 
   fi; 
done < $line

This User Gave Thanks to Franklin52 For This Post:
 

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CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat, read, nobs - catenate files SYNOPSIS
cat [ file ... ] read [ -m ] [ -n nline ] [ file ... ] nobs [ file ... ] DESCRIPTION
Cat reads each file in sequence and writes it on the standard output. Thus cat file prints a file and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no file is given, cat reads from the standard input. Output is buffered in blocks matching the input. Read copies to standard output exactly one line from the named file, default standard input. It is useful in interactive rc(1) scripts. The -m flag causes it to continue reading and writing multiple lines until end of file; -n causes it to read no more than nline lines. Read always executes a single write for each line of input, which can be helpful when preparing input to programs that expect line-at-a- time data. It never reads any more data from the input than it prints to the output. Nobs copies the named files to standard output except that it removes all backspace characters and the characters that precede them. It is useful to use as $PAGER with the Unix version of man(1) when run inside a win (see acme(1)) window. SOURCE
/src/cmd/cat.c /src/cmd/read.c /bin/nobs SEE ALSO
cp(1) DIAGNOSTICS
Read exits with status eof on end of file or, in the -n case, if it doesn't read nlines lines. BUGS
Beware of and which destroy input files before reading them. CAT(1)
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