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Full Discussion: Command to extract word from a string
Top Forums Shell Programming and Scripting Command to extract word from a string Post 302897645 by wisecracker on Tuesday 15th of April 2014 09:24:39 AM
Old 04-15-2014
Totally longhand using __builtins__, CygWin bash under Windows Vista...
All done with understandable variables so you can see how it works...
Code:
#!/bin/bash
# sub_str.sh
my_string="This is a component catalogue..."
substring="a c"
substring_length=3
subscript=0
for subscript in $( seq 0 1 $(( ${#my_string} - 3 )) )
do
	if [ "${my_string:$subscript:$substring_length}" == "$substring" ]
	then
		echo "Substring ~$substring~ found in ~$my_string~ at position $(( $subscript + 1 ))..."
	fi
done
exit 0

result for string "a c"...
Code:
AMIGA:~> cd /tmp
AMIGA:/tmp> dos2unix sub_str.sh
dos2unix: converting file sub_str.sh to Unix format ...
AMIGA:/tmp> ./sub_str.sh
Substring ~a c~ found in ~This is a component catalogue...~ at position 9...
AMIGA:/tmp> _

 

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LEARN ABOUT DEBIAN

sql::reservedwords::mysql

SQL::ReservedWords::MySQL(3pm)				User Contributed Perl Documentation			    SQL::ReservedWords::MySQL(3pm)

NAME

       SQL::ReservedWords::MySQL - Reserved SQL words by MySQL

SYNOPSIS

	  if ( SQL::ReservedWords::MySQL->is_reserved( $word ) ) {
	      print "$word is a reserved MySQL word!";
	  }

DESCRIPTION

       Determine if words are reserved by MySQL.

METHODS

       is_reserved( $word )
	   Returns a boolean indicating if $word is reserved by either MySQL 3.2, 4.0, 4.1, 5.0 or 5.1.

       is_reserved_by_mysql3( $word )
	   Returns a boolean indicating if $word is reserved by MySQL 3.2.

       is_reserved_by_mysql4( $word )
	   Returns a boolean indicating if $word is reserved by either MySQL 4.0 or 4.1.

       is_reserved_by_mysql5( $word )
	   Returns a boolean indicating if $word is reserved by either MySQL 5.0 or 5.1.

       reserved_by( $word )
	   Returns a list with MySQL versions that reserves $word.

       words
	   Returns a list with all reserved words.

EXPORTS

       Nothing by default. Following subroutines can be exported:

       is_reserved
       is_reserved_by_mysql3
       is_reserved_by_mysql4
       is_reserved_by_mysql5
       reserved_by
       words

SEE ALSO

       SQL::ReservedWords

       <http://dev.mysql.com/doc/>

AUTHOR

       Christian Hansen "chansen@cpan.org"

COPYRIGHT

       This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.8.8							    2008-03-28					    SQL::ReservedWords::MySQL(3pm)
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