Programming :: Variables Doesn't Show After The Script Is Run
Mar 20, 2011
I have 2 scripts that I copy from the material I study, one about working with environment variables and the other one about parsing command line output.
The problem with the first one is that the variables doesn't show after the script is run
The script syntax is as follows ( in short )
#! /bin/bash
SYS_NAME=rhel01
OS_SYS="RHEL 05"
export SYS_NAME OS_SYS
echo " The hostname of this system is $SYS_NAME"
[Code].....
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Dec 21, 2008
I have a simple script that I am writing to parse an XML file for me, and update some version numbers. Basically what happens in my script is that I'm running a grep command on the file to get the current version number, then I prompt for a new number, and then I want to globally replace that version number in the file. The problem is, the sed command seems to only want literal values (it doesn't appear to be capable of resolving variables). For example, this code doesn't work:
[Code]...
I have tried removing the curly brackets from the variable names, quoting them, etc. and nothing seems to work. Should I do this with awk instead (and if so can you kindly write out the command for me because I never bothered to learn awk).
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Mar 17, 2011
[code]...
The variables are clean and available in my script. No prob. $old is an IP-address of a server, $new as well. replacement-file is an xml-file (the ip-address to be changed is within an xml-tag). It should be trivial, but it isn't. I spent the last 3 hours reading about the problem, trying several different 'solutions' or workarounds. It should work, the '"' should take care that the variables get expanded, but whatever I try the old server IP isn't replaced.
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Feb 20, 2010
when I check mysql innodb_flush_method it's empty. is it normal?
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Oct 14, 2010
Anyway since I upgraded to Ubuntu 10.10 when I right-click on something and there is another menu in that menu, it doesn't show up for the first time!
for example if I want to create a an "Empty File", I'll right-click on desktop and when I want to go to "Create Document" menu, it doesn't show up! so I must click somewhere else and try again so for the second time it works!!
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Apr 27, 2010
I can define all variables in tcl programming in a file for instance var.cfgand source the same file in my tcl script such assource var.cfgIs this possible in perl too?
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Jul 19, 2010
When I execute something with sudo, the environment that it executes in doesn't have all the environment variables from /etc/profile{,.d/} defined. I googled around and found that there is a way to get the environment variables from the calling environment to be carried over to sudo's own environment, but that's not exactly what I want. I just want sudo to read the /etc/profile and /etc/profile.d/ before executing commands.
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Jul 12, 2010
I'm running into a problem when I try to set a variable to an awk output in c-shell. Right now my command is Code: set STR_MSG_TYPE = `awk -F{ '/msg_type/ {print $2}' <filename> | tr -d }'/''*' ` I then run echo to see what the output is and it returns blank, however, when I run the same awk command from the command line, I get an actual output of "MT-715". Am I setting my variable incorrectly? I do something similar using the date command to set a STR_DATE variable earlier in the code and it works fine and I use the same syntax.
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Sep 13, 2010
i'm practicing in very basic c programs using the gcc compiler.I found that when i create two variables let's say
Code:
int a,b and Code: a=15;
b=3;
a=b;
b--;
then a equals 2.I thought that this isn't normal in C isn't it?I haven't had the time to read the gcc documentation yet...so i think it has something to do with my compiler's default settings.I use the
Code: gcc filename.c -o filename command to compile
Are all variables defined like pointers?
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Apr 26, 2010
I want to check if a MySQL db query will return an empty result - I first do this:
$query="SELECT * from <whatever" ;
$result=mysql_query($query) ;
$row=mysql_fetch_row($result) ;
Now how do I check if $row is empty or not? Will $row="" do the trick?
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Jun 13, 2011
I have a C header file which have arrays of predefined(known) structure type. But i dont have names of arrays and their size. when i include that file and compile my application, i want to know the names and sizesof those arrays.
purpose of application is to get the content of those arrays and to explain it in descriptive words instead of hex numbers.ofcourse this can be done by file pointers and reading also with out header file inclusion, but as i am working in C, once compiled, those variables are in my address space in i include header file.
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Mar 19, 2010
I was trying to make a code for passing variables by reference..here's the code:
#include<iostream>
using namespace std;
void fun(int& ,int& );
int main(){
[Code].....
invalid initialization of non-const reference of type 'int&' from a temporary of type 'int*'
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Mar 30, 2011
I am pretty new to PHP so excuse my dumbness. I've searched this up in quite a few places and cant find anything : Basically, I've made an array, within it are 3 more arrays. Their are two values in each array, 'Name' and 'Age'. Basically I am using a While statement to try and cycle through the 'age' value of my array and state whether or not the person is eligible. (I am actually just learning so I'm doing this to just test myself).
Here is my code
Code:
<?php
$people =array(
array('name' => 'Bob', 'age' => 15 ),
array('name' => 'Jhon' , 'age' => 10),
array('name' => 'Sue' , 'age' => 7));
//($value =& $people[0,1,2][age] );
Here was an attempt to try and create a reference to age, I tried it many different ways
while($age < 10) {
echo ('$name, is eligible') ; } ?>
Okay, so I tried to do this through two ways, one way I tried to create a reference to age, then evaluate it, without that line of code their would be no reference, which way is correct, why wont it work? I am using Xammp, so when I launch local host I get an undefined variable error. What To Do?
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Apr 17, 2011
My php knowledge is very poor (only worked with strings so far), and I am faced which a task that is a real challenge for me: I have a variable, that contains data of different type, in this order: byte, byte, string, string, string, string, short, byte, byte, byte, byte, byte, byte, byte, string.
Strings are of variable length. How could this data be parsed into variables of the right type, and then all converted to strings? What are the functions to use? Strings are unicode ones, and they are delimited by "
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Jan 10, 2010
I just created a website in PHP and tested on my own webserver. All of my session variables worked great. Today I uploaded it to my commercial server host and it does not remember the session vars from one page to the next. Here is the session section of phpinfo().
Code:
session
Session Support enabled
Registered save handlers files user sqlite
Registered serializer handlers php php_binary wddx
DirectiveLocal ValueMaster Value
session.auto_startOffOff
session.bug_compat_42OnOn
session.bug_compat_warnOnOn
session.cache_expire180180
session.cache_limiternocachenocache
session.cookie_domainno valueno value
session.cookie_httponlyOffOff
session.cookie_lifetime00
session.cookie_path//
session.cookie_secureOffOff
session.entropy_fileno valueno value
session.entropy_length00
session.gc_divisor100100
session.gc_maxlifetime14401440
session.gc_probability11
session.hash_bits_per_character44
session.hash_function00
session.namePHPSESSIDPHPSESSID
session.referer_checkno valueno value
session.save_handlerfilesfiles
session.save_path/tmp/tmp
session.serialize_handlerphpphp
session.use_cookiesOnOn
session.use_only_cookiesOffOff
session.use_trans_sid00
You can see that session.save_path is set to /tmp, which is the default on the shared server. /tmp does exist in my document root directory.
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Jan 13, 2010
Im a fresher in PHP.Actually i wanted to know that whether there will be time delay while using session variables in PHP.By using some 10-20 session variables in my code will it affect the speed of the loading of the page.If so then can u suuggest any other method to pass the varaibles which will not slow down the speed?
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Jun 7, 2011
I have sles 10 . A user has a default shell of tcsh. I want to run a script which has to use ksh . In that script only some variables are exported, which will be used in subsequent scripts which are called inside it.
But the variables are not exported. I am unable to find whether its a conflict of shell or what ?? I tried with debug mode, it only displays the command but not execute anyone ..
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May 18, 2011
I have a file that contains 5 fields and anothen one with two I want to take the value from user and search file1 and if the value exists then write in file2 to the $2 to the line that $1=value
file 1
1:fsdfsd:g:33:fsdf
2:yytgdcf:a:3:sgd
[code]....
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Mar 22, 2011
i have following code :
Code:
TMPDIR=`mktemp -d`
mkdir $TMPDIR/old/
[code]...
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Feb 26, 2009
What's the best way to include variables in a string using C,i.e if i want to do the following query in C, how would i do that.How do i build the string variable up in C?
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Jun 19, 2010
Trying to mounts three cifs shares at boot up. I want to mount the shares under three different sub directories in the user's home directory:
share 1 mounted to /home/(insert username here)/movies
share 2 mounted to /home/(insert username here)/music
share 3 mounted to home/(insert username here)/software
I would like to use the environment variable HOME to dynamically build the mount point parameter. I've tried:
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Nov 22, 2010
I'm writing something which takes user input (which may or may not contain spaces...) and then runs a command on a remote system via ssh. However the remote command does not work. I can't print the exact code so I'll just provide an equivelenat problem. This needs to work with filenames which do and do not contain spaces.
Code:
FILES=`ls`
echo "Specify a file"
echo "$FILES"
echo -n "File name: "
read $FILES
ssh root@127.0.0.1 "ls $FILES"
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May 10, 2010
I'm trying to write a bash script and I'm having trouble with it.I have a list of DNS entires from a file called zoneExport.txt.Than I want to parse a log file to see if that DNS entry has been queried for. So I'm running a grep command and trying to save it into a variable. What I'm looking for is a variable ($varGrepQ) that has the number of matches for the grep query. I will then run this through an if statement and do some things from there..
But my problem right now is with this grep query. It keeps outputting '0' even when I know there are records in that file and when I run the same query on the command line I get the actual count. My thought is that the $record variable is not passing right.
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Nov 13, 2010
If I read in variables entered by the user, how can I check to make sure the correct number of variables were entered? For example, after reading in a data file and making it into an array, I have:echo "To check the data, enter the first element number, last element number and step size as x y z:"read x y z.It then goes on to start a loop, but what I would like now (before the loop) is a check to see if three variables have been entered, before the rest of the script continues.
I've tried specifying the variables as $1, $2 and $3, but if I echo $#, the value comes out as zero, so it's obviously not working.
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Jan 26, 2011
I'm playing around with some shell scripting and I've got a directory call CS005 and I'm trying to write a script to I can locate to the directory really quick and easy.
export CS005DIR=/home/stud/0/043234/CS005
Now I get this error
CS005DIR=/home/stud/0/043234/CS005 No such file or directory.
This is because I've got numerical values within my variable.
Is there a way to allow numbers for variable names?
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Feb 8, 2011
I am writing an expect script and I wish to use environment variables that are defined outside of the script.
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Jul 28, 2011
Somehow I'm not really managing this thing, which would d be a nice way to useariables.What I am doing is setting up compound variable in ksh. What I have is a "config" file, which has fields delimited by a semicolon
Code:
cat ${CONFIGFILE} | grep -v "^#" | grep -v "^$" | while read line
do
[code]...
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Mar 18, 2010
I need to find the value of:
Code:
$Namenumber
My script asks for the name you want to look up and I want it to return the value of $Namenumber
I was thinking:
Code:
number=$"$name"number
but this returns
Code:
$Namenumber
but does not actually resolve what the variable $Namenumber is equal to.
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Feb 3, 2010
In C, how can I declare multiple variables at once where the number that needs to be declared is unknown to the programmer.For example, a program that needs to declare some number of integers, but the user will tell the program how many integers to declare. Such as:
x1
x2
x3
x4
x5
.
.
.
Where the programmer doesn't know how many need to be declare you setup theinitialization?
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Nov 29, 2010
Goal:assign integers into array form string.
From string
"123,456,789,0123,4567,8901" (comma separated 6 integer numbers)
To array
[code]....
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