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Top Forums Shell Programming and Scripting String comparison in if statement Post 302281969 by javathecat on Friday 30th of January 2009 12:38:45 AM
Old 01-30-2009
String comparison in if statement

Hi

Just trying to compare the following variables as a condition in an 'if' statement.

Code:
ZERODATA="unidentified 0 b (0%)"
DATA=`sed -n "${dln} p" mpck2.out`

...

if [ "$DATA" != "$ZERODATA" ]
then
...

The problem I'm getting is that the condition always comes out true and doesn't appear to compare them properly. If I use the 'ne' operator I get an error.

(All I actually want to know is if the string DATA contains the substring '0 b (0%)' and use that in the 'if' statement but I just want to get the match for now to simplify the problem.)

Is anyone able to tell me why these would not compare correctly?
 

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WRAPPER(7) PostgreSQL 9.2.7 Documentation DROP FOREIGN DATA WRAPPER(7) NAME
DROP_FOREIGN_DATA_WRAPPER - remove a foreign-data wrapper SYNOPSIS
DROP FOREIGN DATA WRAPPER [ IF EXISTS ] name [ CASCADE | RESTRICT ] DESCRIPTION
DROP FOREIGN DATA WRAPPER removes an existing foreign-data wrapper. To execute this command, the current user must be the owner of the foreign-data wrapper. PARAMETERS
IF EXISTS Do not throw an error if the foreign-data wrapper does not exist. A notice is issued in this case. name The name of an existing foreign-data wrapper. CASCADE Automatically drop objects that depend on the foreign-data wrapper (such as servers). RESTRICT Refuse to drop the foreign-data wrappers if any objects depend on it. This is the default. EXAMPLES
Drop the foreign-data wrapper dbi: DROP FOREIGN DATA WRAPPER dbi; COMPATIBILITY
DROP FOREIGN DATA WRAPPER conforms to ISO/IEC 9075-9 (SQL/MED). The IF EXISTS clause is a PostgreSQL extension. SEE ALSO
CREATE FOREIGN DATA WRAPPER (CREATE_FOREIGN_DATA_WRAPPER(7)), ALTER FOREIGN DATA WRAPPER (ALTER_FOREIGN_DATA_WRAPPER(7)) PostgreSQL 9.2.7 2014-02-17 DROP FOREIGN DATA WRAPPER(7)
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