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Full Discussion: multiple conditions in if statements
Top Forums Shell Programming and Scripting multiple conditions in if statements Post 20513 by Jimbo on Sunday 28th of April 2002 09:42:39 AM
Old 04-28-2002
On assignments to a variable, do x= instead of $x= .

When you use a mixture of -o and -a, you might have to control precedence. In the following, the first line would test true because -o has precedence:
if [ a = a -o b = b -a c = C ]
But add parentheses (you would need to backslash these) and it would now test false:
if [ ( a = a -o b = b ) -a c = C ]

Also, when checking for several values, a case statement makes for nice clean code, and even more handy when each value will result in a different action:
Code:
case $x in
 +|-|/|%) x=$vr1;;
       *) print "You have entered an invalid option."
          exit 1;;
esac

Jimbo
 

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MYSQL_FIND_ROWS 					       MySQL Database System						   MYSQL_FIND_ROWS

NAME

       mysql_find_rows - extract SQL statements from files

SYNOPSIS

       mysql_find_rows [options] [file_name ...]

DESCRIPTION

       mysql_find_rows reads files containing SQL statements and extracts statements that match a given regular expression or that contain USE
       db_name or SET statements. The utility was written for use with update log files (as used prior to MySQL 5.0) and as such expects
       statements to be terminated with semicolon (;) characters. It may be useful with other files that contain SQL statements as long as
       statements are terminated with semicolons.

       Invoke mysql_find_rows like this:

	   shell> mysql_find_rows [options] [file_name ...]

       Each file_name argument should be the name of file containing SQL statements. If no file names are given, mysql_find_rows reads the
       standard input.

       Examples:

	   mysql_find_rows --regexp=problem_table --rows=20 < update.log
	   mysql_find_rows --regexp=problem_table  update-log.1 update-log.2

       mysql_find_rows supports the following options:

       o   --help, --Information

	   Display a help message and exit.

       o   --regexp=pattern

	   Display queries that match the pattern.

       o   --rows=N

	   Quit after displaying N queries.

       o   --skip-use-db

	   Do not include USE db_name statements in the output.

       o   --start_row=N

	   Start output from this row.

COPYRIGHT

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SEE ALSO

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       at http://dev.mysql.com/doc/.

AUTHOR

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MySQL 5.1							    04/06/2010							   MYSQL_FIND_ROWS
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