08-01-2007
Silly newbie question on special characters!
Hello again Gurus,
Can someone please direct me to an online source that specifically explains what characters like [ ! # {} ] mean within if statements? or scripts in general, I have found information about the different letter options you can specify for an if statment, but I get really confused with the ! in front of a -f or particularly this if [ $# -lt 1 ] at the beginning of a script when there have been no variables set.
I've learned the basic purpose of an if statement and case statement sort of, but the special characters are somehow omitted from the sources I've been looking at.
Any source for dummies or idiots like myself would be great!
Thanks so much.
Charlie.
![Big Grin Smilie](https://www.unix.com/images/smilies/biggrin.gif)
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LEARN ABOUT CENTOS
execute
EXECUTE(7) PostgreSQL 9.2.7 Documentation EXECUTE(7)
NAME
EXECUTE - execute a prepared statement
SYNOPSIS
EXECUTE name [ ( parameter [, ...] ) ]
DESCRIPTION
EXECUTE is used to execute a previously prepared statement. Since prepared statements only exist for the duration of a session, the
prepared statement must have been created by a PREPARE statement executed earlier in the current session.
If the PREPARE statement that created the statement specified some parameters, a compatible set of parameters must be passed to the EXECUTE
statement, or else an error is raised. Note that (unlike functions) prepared statements are not overloaded based on the type or number of
their parameters; the name of a prepared statement must be unique within a database session.
For more information on the creation and usage of prepared statements, see PREPARE(7).
PARAMETERS
name
The name of the prepared statement to execute.
parameter
The actual value of a parameter to the prepared statement. This must be an expression yielding a value that is compatible with the data
type of this parameter, as was determined when the prepared statement was created.
OUTPUTS
The command tag returned by EXECUTE is that of the prepared statement, and not EXECUTE.
EXAMPLES
Examples are given in the EXAMPLES section of the PREPARE(7) documentation.
COMPATIBILITY
The SQL standard includes an EXECUTE statement, but it is only for use in embedded SQL. This version of the EXECUTE statement also uses a
somewhat different syntax.
SEE ALSO
DEALLOCATE(7), PREPARE(7)
PostgreSQL 9.2.7 2014-02-17 EXECUTE(7)