General :: Sed: Assigning Its Output To A Variable?

Feb 3, 2011

Kernel 2.6.21.5, GNU/Linux (Slackware 12.0).In this script,

Code:
semoi@darkstar:~$ cat rename4.sh
#!/bin/bash
INPUT="k3b_audio_0_04"

[code]...

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General :: Assigning "find" Operation Output To A Variable?

Jan 7, 2011

I am assigning "find" operation output to a variable. I also need to have error info / stderr if nothing is found in the same variable itself.

e.g.

a=`find . -name "hello.txt" -type f`

I do not want any temp files to be in between infact, redirection.

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General :: Assigning Value To A Variable In Shell Script?

Nov 22, 2010

Why doesn't "var1=`echo $var2 | grep pattern`" work ?

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General :: Assigning Query Result Into A Variable/file?

May 25, 2011

I am connecting to MySQL DataBase using shellscript and writing a select statement like select attachmentid from attachments where pageid=10175 I want to store the output of the select statement into a shellvariable or a file. How can i do it using shellscript.

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Programming :: Assigning Variable Is Messing Up?

Nov 5, 2010

I am trying to run this and was into issues

function() {
node=echo "10.11.12.13" | awk '{split ($0, a, "."); print a[1]}'
}

[code]....

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Programming :: Assigning A Variable For Later Use In Shell Script ?

May 4, 2010

Using things like awk/sed, but have managed to cobble together what I needed so far without a problem. The only thing I'm struggling with is to assign the content of a particular line as a variable, and then to use it again throughout the file.

For example, if what I want is the first line of the file to become the variable "from1", and then to replace the word "Subject" in the file with the string "Message from [from1]". What I thought would work

I tried a few diff combinations but nothing seems to work. All I get is the terminal hanging indefinitely.

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Programming :: Assigning Bash Variable With The System Command In Awk?

Mar 1, 2011

I am having all sorts of trouble trying to assign a variable within an awk script with the system command. I know there is a lot of ways around this problem, but for efficiency reasons, I would like to, within my awk script, do something like

system(x=3)

or

system(x=NR)

and, latter on the shell script which calls the awk script, use the variable $x. But nothing is passed to x. I have already tried things like

command = "x=3"
system(command)

and also used a pipeline within the system to pipe it to /bin/sh In fact tried a lot of stuff like that, using $(( )) etc etc etc I can create directories e write to files (yes, i could write to a file and read from there, but I dont think it is efficient, plus I am puzzled).

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Programming :: Assigning Structure Object's Variable Outside Main() Gives Parse Error

Sep 2, 2010

Kindly take a look at the code below :

Code:
#include <stdio.h>
struct test
{
int i;
int j;

[Code]....

why i am getting this error. I know the error is occuring because i have assigned values to obj.i and obj.j outside main(). But i want to know why do that result in an error. From my part i have created an object 'obj' of stucture 'test' and assigned values to its variables.

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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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General :: Any Way To Store Output Of Command Into Variable?

Mar 3, 2010

I tried using the tail command in my shell script and storing that value in a variable a but an error keeps coming. Is there any other way to store the output of a command into a variable. Cannot Read text from text file and store it in a variable using shell script. The thing is I need a number from the file new.txt and use that number in my script

#!/bin/bash
a = `tail -1 new.txt|head -n 1`
echo $a

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General :: Assign A Variable To The Output Value Of A Program?

Feb 6, 2011

so i wrote myself a very simple hellworld program in c++

...the usual stuff
int main()
{

[code]...

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General :: Need To Store Output Of Bitset() In A Variable / Possible In C++?

Mar 5, 2010

I need to store the output of bitset() in a variable ... is it possible in c++?

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General :: Can't Save Grep Output Into Variable / Solution For This?

Feb 3, 2010

I would like to grep two numbers out of a text file, and divide them.

Here is the script code...

It feels like grep saves a new line too? or what is happening? i simply can't divide them, as it handles the variables as they are empty (and prints the two numbers although they were not printed

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General :: Does The Output Of The Previous Command Get Stored In Any Variable

Mar 26, 2011

For example, when using bash you can use

Code:

to execute the previous command or

Code:

!<number> to execute the Nth command(use history to see the list). Or you can use

Code:

cd !-2:1

to cd into the value in the first field that was executed 2 commands ago Anyhow, say I run a command and the output is a path. Any way to cd and then some variable where OUTPUT of the previous command was stored? A variable that always stores the OUTPUT of the last command.

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General :: Storing A Variable In A Shell Script After Awk Output?

Feb 8, 2010

On command line I have no problem storing a variable e.g

Code:

:~/bin$ process=`ps -ef | awk ' $8 == "idesk" { print $2 }'`
:~/bin$ echo $process
26736
:~/bin$

When I try to incorporate this into a shell script I get a blank.

Code:

:~/bin$ cat process_idesk
#!/bin/bash
process=`ps -ef | awk ' $8 == "idesk" { print $2 }'`

[code]....

The process_idesk script has been chmoded to be executable by the user. I'm sure there must be a silly omission on my behalf.

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General :: Count The Number Of Lines Inside A File And Put The Output Into A Variable?

Feb 1, 2011

i need to count the number of files and put the output into a variable. i used wc -l filename but i couldnt find an option to put the output to variable. example if the number o line is 5, i need the output of echo $x is 5.

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General :: Create A Single Line Of Output From Multiple Variable Lines Of Input

Feb 3, 2010

I need to create a single line of output from multiple and variable lines of input in a Linux bash shell script.

My input file looks like this:

Where there may be any number of umsecondaryphonenumber lines; if there is not a umsecondaryphonenumber line for a telephonenumber, I don't want to write any output.

So, the output file should look like:

The script I have so far is:

My question is - how do print each of the elements of an array in one record - i.e. what do I put in place of howdoiprintarray?

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Programming :: Piping Cat Output To Variable?

Jan 10, 2010

New to ubuntu and shell scripting in general... currently I stored some data into a text file. Right now, I would like to output the data from the text file and store it into a variable. Here's what I have so far:

READ_FILE=$(cat $FILE_NAME)

This definitely works and READ_FILE has the necessary data. However, this command will trigger an output to std output and I will see data on the screen, which is not what I want. I tried:

cat $FILE_NAME | $READ_FILE

and various other variants of this. It does not output to std output but neither does anything gets stored into $READ_FILE. I tried:

cat $FILE_NAME >> $READ_FILE

and it arrived at an error of "ambiguous redirect".

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Ubuntu :: C++ - Can't Pass System Output To Variable ?

Sep 8, 2010

I have a line that looks something like this:

Code:

How do i put its output in a variable?

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Programming :: Retain The Eol In Bash Variable Or Ssh Output?

Jan 17, 2011

I have to save the result of ssh/grep into a file to keep the eol ("/n"):

ssh $SSH_OPTIONS $USER@$NODE "cd $LOG_DIR; grep -h '$pattern' log.*" > $file

So that when I grep on the local file again later, it can be printed out with original log lines. Otherwise, the log lines will be dropped and lines becomes concatenated into a single line, e.g., if I rewrite the script in this way, echoing the $result is not a good idea..

result=`ssh $SSH_OPTIONS $USER@$NODES "cd $LOG_DIR; grep -h '$pattern' log.*"`

is there some workaround that I can save it to a variable rather than file but still keep the eol? That will simplify my script and don't need to do all those I/Os!

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Programming :: Java Output Into Bash Variable?

Feb 20, 2011

I have a bash script that calls a java class method. The method returns a string to the linux console when run independently. how can I assign the value from the java method to a variable in a bash script?running the script: java -cp /opt/my_dir/class.method [parameter]

output: my_string if added in a bash script:

read parameter
java -cp /opt/my_dir/class.method [parameter] | read the_output
echo $the_output

the above doesnt work, I also tried unsuccessfully:

the_output=java -cp /opt/my_dir/class.method [parameter]
the_output=`java -cp /opt/my_dir/class.method [parameter]`
java -cp /opt/my_dir/class.method [parameter] 2>&1

How can i get the output stored into the_output variable?

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Ubuntu :: Cannot Pipe Gdialog Output To Variable / Sort It?

Mar 20, 2010

I'm trying to use the output from gdialog's input box in another command with no success. code...

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Programming :: Receive Command Output And Store It To A Variable?

Apr 3, 2010

Suppose I want to account number of files beginning with abc , I can use "ls 'abc* | grep abc | wc -l", this will return me a number.
I want to store this number in a variable, say var1, so I tried
1. "ls 'abc* | grep abc | wc -l |read var1", but this didn't work as var1 has no value somehow.
2. var1='ls 'abc* | grep abc | wc -l', this just assign the entire string "ls 'abc* | grep abc | wc -l" to var1, which is not I wanted.

I don't want to store the value to a temporary file and then read the value from that file. I think there should be a direct way to get the value, but don't know how. I know in tcsh, one can just use set var1='ls 'abc* | grep abc | wc -l', but it also doesn't work in bash. Can anyone give any clue about this?

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Programming :: Python : Pass Output Of System Commands To Variable?

Jan 25, 2011

I'm trying to write a python script that will use the current user's name when interacting. Ex: when started, it should say "hello daweefolk" when I am logged in.
I've tried
Code:
username=os.system("echo $USER")
but the variable remains empty.
What is the correct code?

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General :: Assign Local Variable Values To Global Variable?

Feb 17, 2011

how to assign a local variable value to a global variable....

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Programming :: Storing Grep Output To Feed Awk To Retrieve Entire Records Matching Variable

Jul 28, 2010

I have two files :

FileA
prot1
prot5
prot9
prot15

[Code]....

What I need to do is to extract from fileB the fields containing only the strings in fileA.

I thought awk could do the job easily with :

Code:
awk 'BEGIN { RS = "###" } /'$variable'/' fileB > output

where variable would maybe be the output of grep from fileA. So can I store the output of grep in a variable to use it afterwards with awk ?

something like that:

Code:
result=`grep prot. fileA` ; awk 'BEGIN { RS = "###" } /'$result'/' fileB > output
but that doesn't work. I'm always getting the entire fileB.

The output of grep get stored in the variable, I verified that with echo. So there is something that I just don't get... It seems to me that the above line should work.

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General :: Create An Environment Variable With The PRINTER Variable?

Apr 16, 2011

I am supposed to create an environment variable with the PRINTER variable, which should resolve to the word sales. Would the command be like this?: env PRINTER - NAME=SALES (is this the command to create that variable with resolving the word sales to it?)

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Debian Multimedia :: Conky Execp / Execpi To Parse Output Of Scroll Variable Generated From Shell Or PHP Scripts

Sep 11, 2015

I am having a hard time getting conky execp/execpi to correctly parse output of the scroll variable generated from shell or PHP scripts.

Code: Select allDebian 8.0
Xfce 4.10
Conky 1.9.0-6

This is a simplified minimal conky configuration file used to show the same problem:

Code: Select allalignment bottom_middle
background no
border_width 1
default_color white
default_outline_color white
default_shade_color white
double_buffer yes

[Code] ....

Here is the output I'm getting:

Code: Select all          ABC       /*doesn't scroll, UNEXPECTED, shows 10 spaces before ABC*/
          ABC       --||--
abcdefghijklmnopABC /*doesn't scroll, WORKS AS EXPECTED as scroll length is 25 which is longer than text "abcdefghijklmnop" */
abcdefghijklmnopABC --||--
abcdefghijklmnopABC /*WORKS, everything before ABC scrolls 5 characters at a time*/

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General :: RHEL5 Not Assigning Partition For Usb Key

Dec 16, 2010

I'm trying to mount a USB key in a RHEL5 box to upload some file. I found doc online and followed it and mounted it fine the first time. Then I unplugged it and found that I have another file to upload so I plugged it back in. However this time it's not assigned a partition (last time was sdb1) and I can't mount it anymore. I think the USB key is recognized and the driver is installed properly:

[code]....

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General :: Assigning Admin Rights To Apps?

Sep 30, 2010

I am using linux mint and have installed Netbeans on it but whenever I run netbeans from accounts other than root it throws an error for not having permission to start glassfish server of netbeans. I also tried running this application using run as administrator option but then the application does not start.

So is there a way to assign netbeans admin rights permanently so that whenever I start this application from other accounts I should not face this error?

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