Sponsored Content
Full Discussion: ! operator in variable
Top Forums Shell Programming and Scripting ! operator in variable Post 302200769 by mmunir on Friday 30th of May 2008 03:21:29 AM
Old 05-30-2008
! operator in variable

Can any body kindly tell me the purpose of ! operator in the following expression:

y=${!x}

Actually when i execute this statement on my solaris 10 terminal, i get empty output.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

And operator

I am trying to check two variables and if both are blank I want to set a flag: the_f3_pid=`rsh $target ps -ef | grep "f3.eab" | awk '{print $2}'` the_f7_pid=`rsh $target ps -ef | grep "f7.eab" | awk '{print $2}'` if ; then y=1 fi I get an error: ./script_name: test: 0403-021 ]... (4 Replies)
Discussion started by: rcarnesiii
4 Replies

2. HP-UX

Or operator with if

hi, i was trying to club to test condition with if. if -o ; then it is giving me error message, i wanted to ask how can we check two condtions with one if. (1 Reply)
Discussion started by: babom
1 Replies

3. Shell Programming and Scripting

scalar variable assignment in perl + { operator

When reading over some perl code in a software document, I came across an assignment statement like this $PATH = ${PROJECT}/......./.... In this particular form of scalar variable assignment, what does the curly braces operators do ? Also, what is the benefit in doing scalar assignment this... (3 Replies)
Discussion started by: JamesGoh
3 Replies

4. Shell Programming and Scripting

Checking if file exists using a NOT operator and shell variable

Hi, I'm new to UNIX, at least shell programming and am having trouble figuring out a problem i'm having. In one section in my nested if statement, i want the program to test if the file does not exist, based on an argument supplied at the command line by the user. What i have is elif ; then... (3 Replies)
Discussion started by: rowlf
3 Replies

5. Shell Programming and Scripting

How can I use a pipe operator in a variable: OPTION="| command"?

I have a string of commands I am piping some data through and I want to allow command line switches to select which commands are used. I want to do something like this: OPTION="| command3" command1 -a -b c.txt | command2 -d -e $OPTION >result.txt I want to do it that way because OPTION may be... (1 Reply)
Discussion started by: KenJackson
1 Replies

6. UNIX for Dummies Questions & Answers

su with << operator

All, THe below is my script , when i use this i am getting nothing . could any one help me to know what is the use of the << operator below su - $8 << supo echo "exportsph $2 $1 $3 $4" exportsph $2 $1 $3 $4 supo i also tried as individual command su - userid << supo , when i do... (3 Replies)
Discussion started by: arunkumar_mca
3 Replies

7. Shell Programming and Scripting

Missing Assigned Variable within logic operator

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 : do echo "what's ur name? (if none just press )" read name changeName = echo $name | sed "s/on/ey/" echo $changeName #this... (8 Replies)
Discussion started by: sexyTrojan
8 Replies

8. UNIX for Dummies Questions & Answers

+= operator

im new to bash scripting and im just using online tutorials and trial and error. i wanted to write a script to read numbers from a file and find their sum: #!/bin/bash theSum=0 for line in $(cat numbers.txt) do let "theSum = theSum + $line" echo "$line" done echo "The sum is... (3 Replies)
Discussion started by: astrolux444
3 Replies

9. Shell Programming and Scripting

Math operator in Variable

I wanted to write a bash script which take a variable X with math operator as (* or / or + or - or % and more ....). Instead of writing logic for each condition can we have a generic logic. Like sudo code below. A=10, B=20 P = $A $X $B; echo $P; ------------- when X has value "*" echo $P,... (1 Reply)
Discussion started by: samcompda
1 Replies

10. Shell Programming and Scripting

Bash variable assignment failure/unary operator expected

I have a little code block (executing on AIX 7.1) that I cannot understand why the NOTFREE=0 does not appear to be assigned even though it goes through that block. This causes a unary operator issue. #!/bin/bash PLATFORM="AIX" NEEDSPC=3000 set -x if ; then lsvg | grep -v rootvg | while... (6 Replies)
Discussion started by: port43
6 Replies
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)
All times are GMT -4. The time now is 01:30 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy