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Top Forums Shell Programming and Scripting looking for some AWK help... hmmm maybe SED...??? Post 302280967 by obarrett on Tuesday 27th of January 2009 11:20:27 PM
Old 01-28-2009
looking for some AWK help... hmmm maybe SED...???

ladies and gents..

im trying to do a surgical search and replace though a 3 GB file;

any timestamp fields that are spaces need to be changed to null
any numerics that are spaces need to be changed to null


so...

say i have a flat file such as this

numeric, char, numeric, date, char

pk|fname|weight|bday|city

1|john| |10-JAN-08|raleigh
2|steph|12| |denver
3|jane|8|21-MAR-01|atlanta
4|eric||06-APR-82|atherton


for any numeric or date field that contains all spaces, i.e.:
row 1 field 3, row 2 field 4

replace the spaces to make a null, such as:

1|john||10-JAN-08|raleigh
2|steph|12||denver
3|jane|8|21-MAR-01|atlanta
4|eric||06-APR-82|atherton




i was thinking something like:

BEGIN {
RS="\n"
FS="|"
}

{
if ($3==" ") {
$3="";
}
if ($4==" ") {
$4="";
}
print $1","$2","$3","$4","$5
}


is awk the way to go with this, or sed with a regex the way i should do it...


thanks much..
 

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Hook(3pm)						User Contributed Perl Documentation						 Hook(3pm)

NAME
APR::Request::Hook - wrapper for libapreq2's hook API. SYNOPSIS
use APR::Request::Hook; DESCRIPTION
This manpage documents version 2.13 of the APR::Request::Hook package. METHODS
APR::Request::Hook disable_uploads APR::Request::Hook->disable_uploads($pool) APR::Request::Hook->disable_uploads($pool, $next) Hook which returns APREQ_ERROR_GENERAL if a file upload field is detected. $pool is an APR::Pool object; $next (if present) is the next APR::Request::Hook in the chain. apr_xml_parser APR::Request::Hook->apr_xml_parser($pool) APR::Request::Hook->apr_xml_parser($pool, $next) Xml parser hook. $pool is an APR::Pool object; $next (if present) is the next APR::Request::Hook in the chain. discard_brigade APR::Request::Hook->discard_brigade($pool) APR::Request::Hook->discard_brigade($pool, $next) Hook which discards the brigade it receives from the parser. $pool is an APR::Pool object; $next (if present) is the next APR::Request::Hook in the chain. SEE ALSO
APR::Request, APR::Request::Parser COPYRIGHT
Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. perl v5.10.1 2011-02-28 Hook(3pm)
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