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Top Forums Shell Programming and Scripting Print all lines between two keyword if a specific pattern exist Post 302952176 by MadeInGermany on Friday 14th of August 2015 01:35:10 PM
Old 08-14-2015
[QUOTE=protocomm;302952163]
Quote:
Originally Posted by anbu23
Code:
$ awk ' /BEGIN/,/END/ { str = str ?  str "\n" $0 : $0 } /END/ { if( str ~ /Amit/ ) { print str }; str = "" } ' file
******** BEGIN *****
My name is Amit.
I am learning unix.
***** END *****

Could you explain the part
Code:
str = str ?  str "\n" $0

of your command line please, it's confuse for me.
I've understood that for each block /BEGIN/,/END/ you do this { str = str ? str "\n" $0 : $0 }, i know the result but it's not clear for me
Thx.
The condition ? trueaction : falseaction exists in awk like in C.
str gets the concatentation of str "\n" $0 if str is not null (undefined, empty, or 0), otherwise it gets $0.
$0 is the entire line.
BTW it will misbehave if the line is 0; better is { str = (str != "") ? (str "\n" $0) : $0 } but still has problem with empty lines.
That's why I prefer the { str = str sep $0; sep="\n" } method.
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MB_STRTOLOWER(3)							 1							  MB_STRTOLOWER(3)

mb_strtolower - Make a string lowercase

SYNOPSIS
string mb_strtolower (string $str, [string $encoding = mb_internal_encoding()]) DESCRIPTION
Returns $str with all alphabetic characters converted to lowercase. PARAMETERS
o $str - The string being lowercased. o $encoding -The $encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used. RETURN VALUES
$str with all alphabetic characters converted to lowercase. UNICODE
For more information about the Unicode properties, please see http://www.unicode.org/unicode/reports/tr21/. By contrast to strtolower(3), 'alphabetic' is determined by the Unicode character properties. Thus the behaviour of this function is not affected by locale settings and it can convert any characters that have 'alphabetic' property, such as A-umlaut (A). EXAMPLES
Example #1 mb_strtolower(3) example <?php $str = "Mary Had A Little Lamb and She LOVED It So"; $str = mb_strtolower($str); echo $str; // Prints mary had a little lamb and she loved it so ?> Example #2 mb_strtolower(3) example with non-Latin UTF-8 text <?php $str = "Txiotn a nE Baos unuvn yn, dpaokeCei unp vw0po kuvs"; $str = mb_strtolower($str, 'UTF-8'); echo $str; // Prints txiotn a nE Baos unuvn yn, dpaokeCei unp vw0po kuvs ?> SEE ALSO
mb_strtoupper(3), mb_convert_case(3), strtolower(3). PHP Documentation Group MB_STRTOLOWER(3)
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