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Top Forums Shell Programming and Scripting File processing is very slow with cut command Post 302389892 by Corona688 on Tuesday 26th of January 2010 10:29:22 AM
Old 01-26-2010
No wonder it's slow -- you are running eighteen separate processes per loop! (stick this in the eye of anyone who thinks 'cat foo | bar' isn't a bad habit!) Working on a solution with sed...

---------- Post updated at 09:29 AM ---------- Previous update was at 09:21 AM ----------

This sed command can reorder field 18 in one process instead of eighteen. It does need backreferences though.

Code:
sed -r 's#([0-9]+)/([0-9]+)/([0-9]+) ([0-9]+):([0-9]+):([0-9]+) GMT([+-])([0-9]+):([0-9]+)#\3\1\2\4\5\6#g'

I'd also suggest only breaking if fileLine is an empty string(and setting fileLine to an empty string before you read). some shells return read-error on the very last line.
 

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NWBPSET(1)							      nwbpset								NWBPSET(1)

NAME
nwbpset - Create a bindery property or set its value SYNOPSIS
nwbpset [ -h ] [ -S server ] [ -U user name ] [ -P password | -n ] [ -C ] DESCRIPTION
nwbpset Reads a property specification from the standard input and creates and sets the corresponding property. The format is determined by the output of 'nwbpvalues -c'. nwbpset will hopefully become an important part of the bindery management suite of ncpfs, together with 'nwbpvalues -c'. See util/nwbpsecurity for an example. As another example, look at the following command line: nwbpvalues -t 1 -o supervisor -p user_defaults -c | sed '2s/.*/ME/'| sed '3s/.*/LOGIN_CONTROL/'| nwbpset With this command, the property user_defaults of the user object 'supervisor' is copied into the property login_control of the user object 'me'. nwbpvalues -t 1 -o me -p login_control -c | sed '9s/.*/ff/'| nwbpset This command disables the user object me. Feel free to contribute other examples! nwbpset looks up the file $HOME/.nwclient to find a file server, a user name and possibly a password. See nwclient(5) for more information. Please note that the access permissions of $HOME/.nwclient MUST be 600 for security reasons. OPTIONS
-h -h is used to print out a short help text. -S server server is the name of the server you want to use. -U user user is the user name to use for login. -P password password is the password to use for login. If neither -n nor -P are given, and the user has no open connection to the server, nwbpset prompts for a password. -n -n should be given if no password is required for the login. -C By default, passwords are converted to uppercase before they are sent to the server, because most servers require this. You can turn off this conversion by -C. AUTHORS
nwbpset was written by Volker Lendecke. See the Changes file of ncpfs for other contributors. nwbpset 8/7/1996 NWBPSET(1)
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