08-24-2006
assiging the return value of the last executed command
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1. Shell Programming and Scripting
How do I evaluate the result of a command assigned to a variable??
Example:
var1=`cmd`
rc=$?
rc will be the result of the assignment rather than cmd since it executes after. How do I evaluate the result of the command itself?
Cheers..:confused: (2 Replies)
Discussion started by: browndr
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2. Shell Programming and Scripting
Hi,
I want to check if a variable has a value assigned to it or not.
I can do following -
cat $Var > File1
if
then
echo "$Var has value"
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3. Shell Programming and Scripting
Hi
I have the following script :
#!/bin/ksh
compare()
{
cat $1>t1
cat $2>t2
cy1=`cut -f13 -d'Ç' t1`
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if
then
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4. Shell Programming and Scripting
Hey ,
I'm trying to perform the following command, however it cannot read the variable assigned earlier. I'm not sure why this happen. Please help thanks
while :
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5. Shell Programming and Scripting
I am making of a script that will go through a couple of for loops and create file names based on the values in that loop, however the variable that combines everything is not getting assigned properly:
#! /bin/bash
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do
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6. Solaris
Hi,
i'm posting this in the Solaris forum although maybe it should be better in the General unix forum, I'm formatting an output witht he following command:
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I am trying to check whether a variable has been assigned on the command line or not.
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10. Shell Programming and Scripting
Experts,
I'm having problems with the code below.
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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)