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Top Forums Shell Programming and Scripting Command for changing date format in a file Post 302599083 by gani_85 on Thursday 16th of February 2012 06:55:36 AM
Old 02-16-2012
Hi Kalpeer,

\( ..... \) :- this is called save operator, what ever you will put in side this like \(abc\), will be stored in unix system buffer(\1..\9). There are 9 system buffers present in unix which is used by shell to store some value for later use.

Here in this command:- sed 's/search/replace/'
1) sed 's/\(.*_\)\(....\)\(..\)\(..\)/\1\4\3\2/' :- the highlighted save operator will hold .*_ means "abc_test_" and will be stored in \1 (first system buffer)
2) sed 's/\(.*_\)\(....\)\(..\)\(..\)/\1\4\3\2/' :- the highlighted save operator will hold .... means 2012 and will be stored in \2 system buffer.

in this way month .. will be stored in \3 system buffer and day will be stored in \4 system buffer.

then you will replace the whole content with \1 means "abc_test_", \4 means day "13", \3 means month"02", \4 means year"2012". So finally you will get abc_test_13022012.dat

Please reply me if you r not clear abt save operator.... thnx
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DATE_PARSE_FROM_FORMAT(3)						 1						 DATE_PARSE_FROM_FORMAT(3)

date_parse_from_format - Get info about given date formatted according to the specified format

SYNOPSIS
array date_parse_from_format (string $format, string $date) DESCRIPTION
Returns associative array with detailed info about given date. PARAMETERS
o $format - Format accepted by DateTime.createFromFormat(3). o $date - String representing the date. RETURN VALUES
Returns associative array with detailed info about given date. EXAMPLES
Example #1 date_parse_from_format(3) example <?php $date = "6.1.2009 13:00+01:00"; print_r(date_parse_from_format("j.n.Y H:iP", $date)); ?> The above example will output: Array ( [year] => 2009 [month] => 1 [day] => 6 [hour] => 13 [minute] => 0 [second] => 0 [fraction] => [warning_count] => 0 [warnings] => Array ( ) [error_count] => 0 [errors] => Array ( ) [is_localtime] => 1 [zone_type] => 1 [zone] => -60 [is_dst] => ) SEE ALSO
DateTime.createFromFormat(3), checkdate(3). PHP Documentation Group DATE_PARSE_FROM_FORMAT(3)
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