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Top Forums UNIX for Dummies Questions & Answers Update a particular line in a file Post 302402899 by krishnampkkm on Thursday 11th of March 2010 12:49:53 AM
Old 03-11-2010
Update a particular line in a file

Hii to all..

I have a file stud.lst

bash-3.1$ cat stud.lst
NO NMAE DOB 10 +2 BE AVG
075 syam saksena 12/12/55 500 398 550 48.26
099 sachin 11/05/47 450 500 600 51.66
300 mohan kumar 19/04/43 500 600 700 60.00
100 john 12/12/52 800 750 700 75.00
125 anil 03/09/38 800 700 750 75.00
101 sourav 30/08/56 600 780 900 76.00

I wanna give provision to change the personal details... with this file in a shell script





echo -n "record u wanna change, give student name :"
read name
grep $name stud.lst #shows record need to update
echo "Enter new data like no name dob 10 12 BE "

# here I've to read the data and calculate average and update the whole line to file....

# How to do it....


Thanking u...Smilie
 

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CHI::Driver::RawMemory(3pm)				User Contributed Perl Documentation			       CHI::Driver::RawMemory(3pm)

NAME
CHI::Driver::RawMemory - In-process memory cache that stores direct references VERSION
version 0.54 SYNOPSIS
use CHI; my $hash = {}; my $cache = CHI->new( driver => 'RawMemory', datastore => $hash ); my $cache = CHI->new( driver => 'RawMemory', global => 1 ); DESCRIPTION
This is a subclass of CHI::Driver::Memory that stores references to data structures directly instead of serializing / deserializing. This makes the cache faster at getting and setting complex data structures, but unlike most drivers, modifications to the original data structure will affect the data structure stored in the cache, and vica versa. e.g. my $cache = CHI->new( driver => 'Memory', global => 1 ); my $lst = ['foo']; $cache->set('key' => $lst); # serializes $lst before storing $cache->get('key'); # returns ['foo'] $lst->[0] = 'bar'; $cache->get('key'); # returns ['foo'] my $cache = CHI->new( driver => 'RawMemory', global => 1 ); my $lst = ['foo']; $cache->set('key' => $lst); # stores $lst directly $cache->get('key'); # returns ['foo'] $lst->[0] = 'bar'; $cache->get('key'); # returns ['bar']! CONSTRUCTOR OPTIONS
Same as CHI::Driver::Memory. SIZE AWARENESS
For the purpose of size-awareness, all items count as size 1 for this driver. (Because data structures are not serialized, there's no good way to determine their size.) # Keep a maximum of 10 items in cache # my $cache = CHI->new( driver => 'RawMemory', datastore => {}, max_size => 10 ); ACKNOWLEDGEMENTS
Thanks to Yuval Kogman whose Cache::Ref inspired me to do this. SEE ALSO
CHI::Driver::Memory, CHI AUTHOR
Jonathan Swartz <swartz@pobox.com> COPYRIGHT AND LICENSE
This software is copyright (c) 2011 by Jonathan Swartz. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. perl v5.14.2 2012-05-30 CHI::Driver::RawMemory(3pm)
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