Programming :: Creating Array From Command Output (Bash Shell Script)

Jan 26, 2011

I have a command that outputs n lines of text, and I want to place each line into an array element, but I can't seem to get the syntax correct

So my command is this:
cat $configfile | sed -n '/cluster:'$clustername'/,/cluster/ p' | awk /host/

Which produces many lines depending on the value of $clustername. I'd like to get each line as elements of an array.

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Programming :: Creating Array In Shell Script

Feb 7, 2011

1. How do I create an array with 5 entries
2. Output one of the entries in the array randomly
3. Subtract the entry output from the array
4. Repeat steps 2 and 3 until there are no more entries in the array

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Programming :: Writing Shell Snip To Import CSV Data Into Bash Array

Jan 5, 2011

I have been trying to write a simple snip of bash shell code to import from 1 to 100 records into a Bash array.

I have a CSV file that is structured like:
record1,item1,item2,item3,item4
record2,item1,item2,item3,item4
record3,item1,item2,item3,item4
record4,item1,item2,item3,item4

And would like to get this data into corresponding arrays as such:
$record1[item1-4]
$record2[item1-4]
$record3[item1-4]
$record4[item1-4]

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Programming :: Assigning Output Of A Command To An Array In Perl?

Nov 25, 2010

I am trying to execute a Unix Command in perl and assigning its output to an array:

Code:
@File_List=exec("ls -1 /tmp");
but it is not working. I have tried the perl function system() also but its return code is

[code]...

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Programming :: Show The Output Of Shell Command Into A Textbox, Ex Ps -efc Command?

Oct 20, 2010

I am using gtk to program GUI. How can I show the output of shell command into a textbox, ex ps -efc command ?

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Programming :: Using Bash Command To Execute Output Of Awk?

Mar 24, 2011

I am trying to process a column separated data file, with a few bash command. For example, I have

Code:

file1 aaaa yes
file2 aaaa no
file3 bbbb yes

Let say I want to create new file with the output of first column and do something else with the output of 3rd column. Of course there are many ways to process this data file, but I wish to know by using awk, how could I do it. I'm trying:

Code:

awk '{system("touch $1")}' datafile

but the shell command will not able to get the awk '$1' output. How do I get this done ? And for another question, if the data file contains the variable name of a shell variable, how could I make use of it during a awk output ? For example I have a datafile1:

Code:

server1 yes
server2 no

And in another server declaration data file, I got this datafile2:

Code:

server1=xxx1
server2=yyy1

And in my awk script, I want to achieve something like (the syntax is definitely wrong, just to demonstrate what I assume it will like):

[code]....

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Programming :: Organize Bash Script Output Of Which Is Like On Top Command

Sep 12, 2010

Is it possible to organize bash script output of which is like on top command i.e. monitoring every let's say 1 sec and old information would cleared?

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Programming :: Bash Ambiguous Redirect - Redirect One Command Output Which Will Be Treat As A Content Of File For Another Command?

Mar 9, 2011

I am trying to grep multiple numbers from file, grep does have the -f option for that.

Code: grep -f <`seq 500 520` /etc/passwd I know this could be done with

Code: for i in `seq 500 520`; do grep "$i" /etc/passwd; done But my question is fare more behind this example. It is possible to redirect one command output which will be treat as a content of file for another command ?

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Programming :: Global Bash Shell Functions - A.sh: Line 2: Echotm: Command Not Found

Sep 13, 2010

I wonder if there is anyway to make a user-defined bash shell function global, meaning the function can be use in any bash shell scripts, interactively or not. This is what I attempted:

Code:

$ tail -n 3 /etc/bashrc
echotm () {
echo "[`date`] $@"
}

[code]....

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Programming :: Perl About System Command / Fails If The Standard Shell Is Dash And Not Bash?

Jun 30, 2011

I am trying to fix a perl script, and I really suck at perl. But I think this problem will be easy for people who know it.

The problem is, I have an old setup script someone wrote many years ago. It fails if the standard shell is dash and not bash. The only way I've gotten it to work is to point /bin/sh to bash. I looked thru the script and it uses "system" many places, and I think that's the problem.

I searched for it and found this link:url

My plan is to include this function:

Code:
sub system_bash {
my @args = ( "bash", "-c", shift );
system(@args);
}
Then I could simply change all calls to system into system_bash and it should work?

The parameter to the system calls is usually some variable. What if the parameter is a list already? Do I need to test for it somehow, and if it's a list, prepend "bash" and "-c" to the list? How do I do that?

In the script there are lots of places like this:

my $error = system($cmd);
if ($error) {
die/warn "some error message";
}

Shouldn't there be a return in the system_bash function?

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Programming :: Bash Shell Read User Argument From Command Line And Test It

Aug 29, 2010

Trying to create a small script that will read user's input, test if user entered some input and if not display some message or display a text using user's input.

The script is the following but i get an error saying "[: 6: =: argument expected"

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Debian :: Creating A Bash-shell Script

Dec 1, 2015

how to do in Debian

1. am required to create a bash-shell script called terminator that terminates all processes of a name given to the shell script as an argument. Make sure the terminator shell script will not take any crucial file system services as arguments.

2. Show how you would configure an Ethernet card by reapplying your existing IP and network mask

3. Install a workable nfs file sharing system between your system and a remote system, using optimum values for resize and wsize.To demonstrate send a 512Mb block of random data between client and server using the dd command.Write down the relevant steps and procedures

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Programming :: Bash Shell Scripting / Using The Sort Command To Sort The Top 5 CPU Processes?

Feb 28, 2010

What options should I use when I'm using the sort command to sort the top 5 CPU processes (ps -eo user,pid,ppid,%cpu,%mem,fname | sort ??? | head -5) showing max to min usage?

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Programming :: Bash Array Add Function Example Using Indirect Array Reference As Function Argument?

Jun 20, 2010

I looked on the net for such function or example and didin't find anything, thus after having made one i guess it would be legitimate to drop it to see what others thinks of it.

#!/bin/bash
addelementtoarray()
{
local arrayname=$1

[code]....

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Programming :: C Program To Get Input Of Array And Output It

Aug 14, 2010

I am creating a 15 integer array which is input from the user and outputted for the.

Ex.
Enter the array values: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Your values are: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Code:

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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?

Example:

Code:

>>> 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 :: Send A Mysql Query Output Into An Array?

Jul 27, 2010

i will be quick, im trying to send a mysql query output into an array ie:

Code:
declare -a HD
HD=`echo "USE db; SELECT uid FROM user" | mysql -u $login -p$pwd -h $dbhost -B`
echo ${#HD}
those vars in mysql connection are previously and correctly assigned.
but got an error

script.sh: 2: declare: not found

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Programming :: Irregular 2D Array In Shell Script

Aug 16, 2010

I am trying to create a shell script to automate a process that takes inputs from two sets of data. The variable SHELL in my system echoes as /bin/tcsh, but I see that my /bin directory has other possibilities, such as bash. So, if changing the shell could simplify my problem, then I would go with that.

I have a list of files containing data about objects, say
obj1.dat, obj2.dat, .... objn.dat, where n is around 20 (it varies).
These objects belong to a few different categories, and there are files detailing the properties of the categories, say
cat1.prop, cat2.prop, ... catm.prop, where m is smaller than n (more than one object in each category).

I know that shell scripts can handle 2-d arrays, although I am not sure how. The thing here is that category 1 could have 5 objects and category 3 could have 7 objects. So, this could produce a 2-d array, but not a rectangular one. I need to process these files taking into acount the data about the object and the properties of the category the object belongs to. Here is what I tried to do:

# First I enter a list of category names and m lists of objects in each category
category='cat1 cat2 cat3 ... catm'
cat1-obj='obj1 obj2 obj3'
cat2-obj='obj4 obj5'
cat3-obj='obj6 obj7 obj8 obj9 obj10'
.
.
.
catm-obj='objx objy objz objn'

# The lines above show the irregular 2-d array. Then I try to trick the script into parsing through this irregular 2-d array:
for i in $category
do
data='$i -obj'
for j in $data
do
mycommand $j.dat $i.prop > $j-$i.out
done
done

The line "mycommand $j.dat ..." is just the line that processes the information. That has been tested to work fine. Feeding the information to this is what does not work. The lines " data='$i-obj' " and " for j in $data " do not have the desired effect. I have tried other ways, like data=`echo $i "-obj"` and things of the sort, by to no avail.

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Programming :: Shell Scripting Array - Bad Substitution

Jun 19, 2009

I made a little rsync script for log transfer.

Code:
SERVERS=(SERVER1 SERVER2 SERVER3)
SERVER1_SERV=(web ftp mail)
SERVER2_SERV=(web transcoding)
SERVER3_SERV=(web ftp mail)
for SERVER in ${SERVERS[@]}
do
echo "Starting tranfer for server $SERVER"
for SERVICE in ${$SERVER_$SERVICE[@]}
do
something_to_be_done
fi
done
But when I run it I get ${$SERVER_$SERVICE[@]}: bad substitution

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General :: Creating A Shell Using C Which Could Implement LS Command

Sep 4, 2010

I would like to create the shell which would support the LS command in C++. And the way the command prompt can be changed.

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Programming :: Bash Array - More Than One Value Per Item?

Nov 28, 2010

Is it possible to have an array in Bash that can hold more than one value per item?

For example I would like an array like this:

Entry 1: apple, green
Entry 2: banana, yellow

And be able to call the fruit names and their colour in a list. Something like:

for fruit in "${array[@]}"
do
echo a $fruit is $colour
done

If that is possible, is there a limit to values per item? For example some entries in an array could be:

Entry 1: apple, green, round, pips, tree
Entry 2: banana, yellow, long, skin, tree

And I would like to pick out the values such as #3 being "round" and "long".

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Programming :: How To Copy Array In Bash

May 13, 2010

I have this code:

Code:
original_content=${content[@]};
echo ${#content[@]} # is 23
echo ${#original_content[@]} # is 1

I'd expect original_content should be copy of content. How to copy array?

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Programming :: Nested Loop Using A Counter To Increment Array Output?

Feb 2, 2011

I work in a simulations environment. I'm trying to write a bash script that will read fields from a .csv file into an array, the first field being an identifiyng number and the second field being a corresponding url. There are about 1600 of these number/url combinations in the .csv file that i'm reading from. Once that is done i want it to parse a text file and match the number, when it has a match i want it to enter the corresponding url into a particular line in the text file. The script I have written (with the help of the people on this forum a while back) does this well, but now I have a lot more data to parse. I think the script itself is explanatory enough to see what i'm doing. What i would like to do is cut it down to one while loop nested inside another loop so that I don't have 1600 or so elif statements. I can't figure out how to increment the output of the array. for instance, the first cycle would find the number that matches ${record1[2]} and input the url stored in ${record1[3]}. the next cycle would match ${record1[4]} and input the url in ${record1[5]}, and so on, does that make sense? The code is below and a sample .csv and text file are attached.

[Code]...

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Programming :: Array In Shell Script - Code Not Working

Oct 16, 2010

I am passing an array in function. I want to read the first content again and again until it is empty so

function calltoarray
{
read $1[0]
while [ ! -n "$1[0]" ]
do
echo empty
read $1[0]
done
}

But the code is not working. If we just press enter without value at read $1[0]. It do not get into while loop.

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Programming :: Bash String Splitting Into Array?

Oct 14, 2010

I am using gnu bash 3.2I need to split the string into array like

a=this_is_whole_world.file # split [_.]
I need to split this on _ and . some thing like this
a[0]=this
a[1]=is
a[2]=whole
a[3]=world
a[4]=file

preferable using bash regex. if not sed is also ok.

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Programming :: Using An Array In Bash For Mutiple Paths?

Mar 29, 2011

I'm trying my hand at arrays in bash for a backup script. Now I not sure if this is the correct thing to do and just look at website and amended but does'nt work. Could someone tell me where I'm going wrong

LOG_DIR="/home/ops/Desktop/temp"
array[0]=3
array[1]=/home/ops/Desktop/dir1

[code]...

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Programming :: Bash - Read The Array Dynamically?

Sep 24, 2010

Code:

test=(1 2 3 4 5)
for car in ${test[@]}
do
echo "Element : $car"

[code]....

if variable $car equals 1, new element is added "6" to an array. But i don't know why when i am printing all elements of this array (echo "Element : $car") this element ("6") is not mentioned, but if i make a command which check an amount of contained elements by array it will be 6 elements.

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Programming :: Using Bash To Append A String To Array?

May 19, 2011

I have the following function that does not iterate through the array I want to be able to do some manipulation on each element in the array[@].it appears the below array has only one item in the array whereas i want the array to have 3 items hence the loop three times printing the message Any ideas why this is not happening ?

function foo() {
name =$1
array=( "$2" )

[code]...

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Programming :: BASH: Listing Contents Of .zip File Into An Array?

May 18, 2010

I want to list the contents of a zip file amd put each entry into an array. I've been doing

[code]....

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Programming :: Bash - Searching Strings For Array Elements?

Apr 30, 2010

...and returning the index of the found element in its array.

I have:

for ((i=0; i < ${#array1[@]}; i++)); do
# Read each line of the file test
if [[ $(eval "sed -n '$(($i+1))'p test") == *${array2[0]}* ]]
stuff

I want to find the index of the found substring in array2 and only if it isn't found, move on to the next element of array2. I don't know the size of array2 so that [0] has just got to go.

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