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Top Forums Shell Programming and Scripting Speeding up shell script with grep Post 302994609 by Don Cragun on Saturday 25th of March 2017 06:07:42 AM
Old 03-25-2017
In addition to what bakunin suggested, you might also consider the following to more closely match the output produced by your current script...

Making the wild assumptions that:
  1. master.csv is a character separated values file with comma as the character separating fields, and
  2. the field containing the phone number in master.csv is the 1st field
how long does the following script take:
Code:
awk -v fn=1 -F',' '
FNR == NR {
	p[$fn]
	next
}
{	print "checking master for phone number", $1
	if($1 in p) {
		print $1, "already exists in master file "
		print > "unusable_numbers"
	} else {
		print $1, "looks good we can use this saving to usable_numbers"
		print > "useable_numbers"
	}
}' master.csv new

to do the same job?

If the field number in master.csv is not the 1st field, change the value assigned to the fn variable from 1 to the field number of the field containing the phone number.

If the field separators in master.csv are not commas, change the character in the -F option-argument to the desired character.
 

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CG(1)																	     CG(1)

NAME
cg - Recursively grep for a pattern and store it. SYNOPSIS
cg [ -l ] | [ [ -i ] pattern [ files ] ] DESCRIPTION
cg does a search though text files (usually source code) recursively for a pattern, storing matches and displaying the output in a human- readable fashion. It is intended to give some of the functionaly of AT&T's cscope(1) tool, with the advantages of simplicity and not being language-specific. The script will colorize output if configured as such. It is typically run with a Perl regular expression to search for. The search can be made case insensitive by using the -i option. A list of files may also be specified with an additional argument after the pattern. Put the files pattern in quotes to make it be matched by Perl rather than by the shell. Running the script with no arguments will recall the results of the previous search. After the search, entries found can be edited using the vg(1) script. The -l option shows the last log made. SOME EXAMPLES
cg - alone recalls the previous search results. cg -i pattern - search the default list of files for all files matching the pattern (and case-insensitively). cg pattern '*.c' - search recursively for pattern in all *.c files. This automatically converts '*' to '.*' and '.' to '.' for you and does a Perl pattern match on all files in the tree. cg pattern *.c - search through the shell-expanded list of *.c files, so not done recursively (in other words, only the files your shell pass to the script as arguments). cg -l - show the last log made. COMMAND-LINE OPTIONS -i Do a case-insensitive search. -l Show the last log made. -p Toggle the default pager option. cg has a bulit-in pager function, which can be enabled or disabled by default (in .cgvgrc). If the default is enabled, this option disables the pager; if the default is disabled, this option enables it. -P Force the built-in pager to be disabled. FILES
${HOME}/.cglast Log file of the last search. ${HOME}/.cgvgrc Per-user configuration file (if the defaults are not desireable). ${HOME}/.cgvg/* Log files in $HOSTNAME.shell_pid form with the log of the last search. SEE ALSO
vg(1), perl(1), find(1), grep(1), cscope(1) AUTHOR
cg was written by Joshua Uziel <uzi@uzix.org>. 13 Mar 2002 CG(1)
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