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Top Forums UNIX for Dummies Questions & Answers awk -remove pattern from file Post 302964732 by newbie2010 on Monday 18th of January 2016 02:46:28 PM
Old 01-18-2016
awk -remove pattern from file

I have a file like this - I want to remove the 2015 (or any four digit #) from column $4 so I can get:
Code:
Nov 05 1997 /ifs/inventory2/

for example. Im not sure how. Should I use an if statement with awk?

Code:
Jan 16 2015 23:45 /ifs/sql_file
Jan 16 2015 23:45 /ifs/sql_file
Nov 05 2015 1997 /ifs/inventory2/
Nov 05 2015 1997 /ifs/inventory8/
Nov 05 2015 1997 /ifs/inventory7/
Nov 05 2015 1997 /ifs/inventory6/
Nov 05 2015 1997 /ifs/inventory5/

What I have got is this:
Code:
/tmp/filez1 |gawk '{if ($4 ~/1997/) }

but I don't know how to remove the 2015
from the file when 1997 is present.


I don't want anything removed from lines that do not have 1997
Moderator's Comments:
Mod Comment Using CODE tags isn't that hard. Please read the personal mail that received along with your infraction and review the tutorial that is included.

Last edited by Don Cragun; 01-18-2016 at 04:17 PM.. Reason: Change HTML tag to CODE tag to match closing CODE tag; add CODE and ICODE tags.
 

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install::TempContent::Objects::mod_perl-2.0.9::docs::apiUserRContributed Perinstall::TempContent::Objects::mod_perl-2.0.9::docs::api::APR::Date(3)

NAME
APR::Date - Perl API for APR date manipulating functions Synopsis use APR::Date (); # parse HTTP-complient date string $date_string = 'Sun, 06 Nov 1994 08:49:37 GMT'; $date_parsed = APR::Date::parse_http($date_string); # parse RFC822-complient date string $date_string = 'Sun, 6 Nov 94 8:49:37 GMT'; $date_parsed = APR::Date::parse_rfc($date_string); Description "APR::Socket" provides the Perl interface to APR date manipulating functions. API
"APR::Date" provides the following functions and/or methods: "parse_http" Parse HTTP date strings $date_parsed = parse_http($date_string); arg1: $date_string ( string ) The date string can be in one of the following formats: Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123 Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036 Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format refer to RFC2616 for the details (GMT is assumed, regardless of the used timezone). ret: $date_parsed ( number ) the number of microseconds since 1 Jan 1970 GMT, or 0 if out of range or if the date is invalid. since: 2.0.00 Remember to divide the return value by 1_000_000 if you need it in seconds. "parse_rfc" Parse a string resembling an RFC 822 date. It's meant to be lenient in its parsing of dates. Hence, this will parse a wider range of dates than "parse_http()". $date_parsed = parse_rfc($date_string); arg1: $date_string ( string ) The date string can be in one of the following formats: Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123 Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036 Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format Sun, 6 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123 Sun, 06 Nov 94 08:49:37 GMT ; RFC 822 Sun, 6 Nov 94 08:49:37 GMT ; RFC 822 Sun, 06 Nov 94 08:49 GMT ; Unknown [drtr@ast.cam.ac.uk] Sun, 6 Nov 94 08:49 GMT ; Unknown [drtr@ast.cam.ac.uk] Sun, 06 Nov 94 8:49:37 GMT ; Unknown [Elm 70.85] Sun, 6 Nov 94 8:49:37 GMT ; Unknown [Elm 70.85] ret: $date_parsed ( number ) the number of microseconds since 1 Jan 1970 GMT, or 0 if out of range or if the date is invalid. since: 2.0.00 Remember to divide the return value by 1_000_000 if you need it in seconds. See Also mod_perl 2.0 documentation. Copyright mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0. Authors The mod_perl development team and numerous contributors. perl v5.18.2 2015-06-install::TempContent::Objects::mod_perl-2.0.9::docs::api::APR::Date(3)
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