Programming :: Indexing Variables In Lists Using Shell Scripts?

May 27, 2010

I have a question concerning indexing over lists with unix shell scripts. I have very large text files (up to 20 Gb) with the data shown below:



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Programming :: Setting Variables In C-shell?

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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Programming :: Shell - Substition Of Variables?

Mar 22, 2011

i have following code :

TMPDIR=`mktemp -d`
mkdir $TMPDIR/old/


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Programming :: Advanced Uses Of Variables In Korn Shell?

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

cat ${CONFIGFILE} | grep -v "^#" | grep -v "^$" | while read line


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Programming :: Exporting Makefile Variables To $(shell) Environment?

May 12, 2010

I'm aware that one can export make variables to other makefiles; however, how does one export them to the environment of $(shell)? Take the example below:

export TEST
VARIABLE=$(shell echo $$TEST)
.PHONY: all

In this example, I might call make TEST=test. The goal is for $TEST to be available to the environment of the shell escape. This is because I need its value in a script which is called. For example:

VARIABLE=$(shell current solution is the following:VARIABLE=$(shell export TEST="$(TEST)"; but this only works if I know all if the variables needed at that point (as opposed to being able to export variables in included makefiles.) Is there an easy solution?

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Programming :: C-shell Scripting Syntax Error When Defining Two Variables A1 And A2

Apr 5, 2011

I am trying to modify a script for research purposes and am having difficulty here as I have little prior experience with C-shell scripting.

The script looks as follows (it includes tcl commands like runFEP that you can ignore)


for ((old=1, new=2; old<=4; old++,new++))
cat > input${new}.conf <<EOF

My question: I keep getting a syntax error when defining my two variables a1 and a2. I essentially need these variables to be
a1 = value of variable old divided by 50
a2 = value of variable new divided by 50

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Programming :: Indexing Multiple Drives With Perl?

May 7, 2010

I have 4 separate drives, all un-RAIDed.Each drive has almost the same root directories, but different contents in each folder.

For example:

/mnt/sda/TV Shows/Lost/
/mnt/sdb/TV Shows/Your_Favorite_Show/

The goal is to have a single folder that has symlinks to all the files in each of the drives. Pretty much a poor man's JBOD. Previously, I had problems with conditions like 2 drives having the same sub folder contents, but I ended up solving that with the current script I'm using now.What I'm looking for now is speed. I'm very new to Perl and the script takes about 12 minutes to complete with the current drives.

Basically, the script makes a list of all directories and files in each drive. First, it makes the directories. I didn't use any validation because if a directory already exists, it simply won't make one. However, with the files, I used a hash to only keep the unique files. Then I use the key/value pairs with ln to create every link to the files only, not directories.


use warnings;
my @drives_to_sync = qw ( /mnt/sda/ /mnt/sdb/ /mnt/sdc/ /mnt/sdd/);


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General :: Gnuplot Variables Into Shell?

Feb 17, 2010

in gnuplot it's possible to set the value of a variable via linux shell command.or instance we can do

a="`echo 1`"
b="`echo 2`"


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General :: Experimenting With Shell Variables?

Oct 12, 2010

Explain the following unexpected results

$ whereis date
date: /bin/date ?
$ echo $ PATH


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General :: Variables Between Shell Scripts?

May 20, 2010

Ive created some custom shell scripts to run during the kernels boot process (they are called from the init script).I was wondering if there's any way to assign a variable that can be accessed between different scripts.For example my first script checks which type of pc i am installing on and assigns the hard drive location to a variable.HARDDRIVE = "/dev/sda1"at the end of the script it calls another script. In this script I cant reference HARDDRIVE as it is blank, to get around this I need to repeat the same code for assigning it.Its more of a space/aesthetics issue but I figured someone might know the solution off the top of their head

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Red Hat :: Call CGI W/POST Variables From Shell?

Jun 16, 2009

I've got a CGI that I'm trying to debug. Apache gives me an ambiguous 500 error; it would be nice to see the raw output via the shell. I've got the POST request w/headers as follows. What's the best way to troubleshoot this?

POST /cgi/packBoxes.cgi HTTP/1.1
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8


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General :: Shell Scripts Variables Test?

Aug 5, 2010

What will be the output of the following Shell Script?

[-n $a]


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General :: Set Environment Variables For A Particular User On C Shell Configurations?

Jun 2, 2011

I have been give a task of replicating one of our production systems to create a test system. I have been restricted to use c shell to set up its environment variables. I am new to this my questions is how do i set environment variables for a particular user on c shell e.g ORACLE_HOME and ORACLE_SID permanently for a particualar user i know in bash you edit the .bash_profile file. What do i do for c shell?

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General :: Changing Shell From C To Bash - Apps Or Variables?

Jun 21, 2010

I have a user that has been used for long time now that runs o C Shell... now there is a need to change it to Bash Shell? Can I cause a problem changing his shell from C to bash? I mean apps or variables?

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General :: Formatting - Shell Script That Outputs Few Variables

Jun 6, 2011

I hav a shell script that outputs few variables. i want to output them in a table format. any unix commands?

The output i need is:

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Red Hat :: Setting System Wide Shell Variables In RHEL5?

May 10, 2010

I have an RHEL 5 server joined to a windows domain. However I wanted to add variable lines to be executed each time a user logs in. However I succeeded to put them in /etc/bashrc file and it worked like a charm.
But its annoying that everytime the user logs in to the shell remotely it displays the whole variables that were declared. Is there a way how to add them once and not to display the output each time the user logs in?

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Ubuntu :: Write A Simple Shell Script And Environment Variables?

Feb 8, 2010

I'm trying to write a simple shell script, its purpose is not important. The script needs to make use of the system $HOSTNAME environment variable. I had a look at this page which provides the following example.

echo "You are user $UID on $HOSTNAME"
echo "Your home directory is: $HOME"
echo "$HOSTNAME is running $OSTYPE"


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Programming :: Match Strings Inside 2 Lists?

Jul 8, 2011

I have that script that checks the nfs mount points:

#set -xv


I am no expert in loops and it took me all day to write that. I couldn't really tell how to match the string in $df_file and $fs_share, so I did a little workaround with a count.

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Programming :: Script To Exclude Words From A Lists?

Jun 16, 2010

how to delete string inside the file addresses.txt. The string I want to delete on addresses.txt was on removed.txt. I have a file addresses.txt and it includes the ff format:


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Programming :: Association Lists Are Faster Than Hash Tables?

Jun 13, 2011

I'm writing an interpreter and it used simple association lists for mapping varaible names to their values. Here's the code:


#include "assoc_array.hpp"
#include <string.h>
using namespace LANG_NAMESPACE;


I thought that I would replace it with a hash table to increase performance. Note that I decided to store linked lists in the buckets instead of the actual values, in case the hash function outputs the same index for multiple variable names:


#include "hash_table.hpp"
#include "assoc_array.hpp"
#include <string.h>


It runs in about 0.333 seconds on my machine. Since I'm using git version control, I decided to bring back the old version that used association lists. To my amazement, it ran 3 times faster, completing in 0.116 seconds! Is my hash table implementaion really that bad, or is this a really poor benchmark (and real-world code actually will be faster using the hash table)?

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Programming :: Sending Mail To Mailing-lists In Perl?

Jan 25, 2011

Im creating a perl script that will be sending out mail to mailing-lists, but im not getting it to work. Its no problem getting the script to send mail to regular mail addresses, but it doesnt seem to handle to send mail to mailing lists. Im using the Net::SMTP perl to send mail from a perl script to a mailing list (and not just regular mail addresses) ?

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Programming :: Define All Variables In Tcl Programming In A File For Instance Var.cfg?

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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Programming :: Shell Scripting / Create A Shell Script Similar To Ls?

Jun 5, 2011

I am trying to create a shell script similar to ls, but which only lists directories. I have the first half working (no argument version), but trying to make it accept an argument, I am failing. My logic is sound I think, but I'm missing something on the syntax.

if [ $# -eq 0 ] ; then
for i in * ; do
if test -d $d/$i ; then
echo "$i:"

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Programming :: Bash-shell-like Less Functionality In The Python Shell?

Jun 25, 2010

Is there some type of functional way to read things in the Python shell interpreter similar to less or more in the bash (and other) command line shells?



>>> import subprocess
>>> help(subprocess)
[pages of stuff to read]

I'm hoping so as I hate scrolling and love how less works with simple keystrokes for page-up/page-down/searching etc.

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Programming :: C With Gcc: Are All Variables Defined Like Pointers

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


int a,b and Code: a=15;

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 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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Programming :: How To Check For Empty Variables In PHP

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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Programming :: Get List Of Variables Of Particular Type ?

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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Programming :: Passing Variables By Reference?

Mar 19, 2010

I was trying to make a code for passing variables by's the code:

using namespace std;
void fun(int& ,int& );
int main(){


invalid initialization of non-const reference of type 'int&' from a temporary of type 'int*'

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Programming :: PHP Accessing Variables Within Array

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
$people =array(
array('name' => 'Bob', 'age' => 15 ),
array('name' => 'Jhon' , 'age' => 10),
array('name' => 'Sue' , 'age' => 7));
//($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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Programming :: PHP - How To Parse Data Into Variables

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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