Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Need to get a loop variable from output of a command
Top Forums UNIX for Dummies Questions & Answers Need to get a loop variable from output of a command Post 302721529 by pat_pramod on Thursday 25th of October 2012 01:37:08 PM
Old 10-25-2012
Need to get a loop variable from output of a command
Hi,

I am trying to get a loop counter i and set its value as the ouput of a command:

Code:
i=`printmo TEST1 | grep -i TEST2 | wc -l`

Then I want to use i as counter to run a loop i number of times.
Like if i gets a value of 5 I'll have to run loop 5 times.
But will i here be a numeric variable? If it won't be numeric then how can I make it a numeric variable and use it as couter to run the loop.

Please help. I tried to search but didn't get what I am looking for.

Thanks in advance,
Pramod
Last edited by Scott; 10-25-2012 at 02:59 PM.. Reason: Code tags
 

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Command output to a variable.

With cut -c 8-13 myfile, I am getting some numeric value. In my shell script I am trying to assign something like this, var=cut -c 8-13 myfile But at the time of execution I am getting -c is not found. If I dont assign, then script executes well. Can we not simply use the value from one... (8 Replies)
Discussion started by: videsh77
8 Replies

2. Shell Programming and Scripting

While loop using command output...

If I run this command networksetup -listallnetworkservices I get the following output. Ethernet AirPort *Parallels Host-Guest *Parallels NAT MY VPN Ethernet 2 I want to make changes to only anything that contains the word "Ethernet" which I can do with grep. But What I really need a... (6 Replies)
Discussion started by: elbombillo
6 Replies

3. Programming

Command output into a variable

Hi, with this command: cu -l /dev/ttyACM0 -s 9600 > name.txt I put the output of the port in a txt Is posible to do the same (or similar) in a var directly, inside a C program? cu -l /dev/ttyACM0 -s 9600 > variable ? I have trying this withs pipes, but i dont know how to... (6 Replies)
Discussion started by: daaran
6 Replies

4. Shell Programming and Scripting

How to give a variable output name in a shell script inside a for loop

Hi all I run my program prog.c in the following way : $ ./prog 1 > output.txt where 1 is a user defined initial value used by the program. But now I want to run it for many a thousand initial values, 1-1000, and store all the outputs in different files. Like $ ./prog 1... (1 Reply)
Discussion started by: alice06
1 Replies

5. Shell Programming and Scripting

Redirect output of command line to for loop

I would like to redirect output of command line in for loop as $line. Output should be processed as line but instead it throw whole output. Could somebody help me on how to redirect output of command line and process it line by line without sending output to any file. below is my code ... (1 Reply)
Discussion started by: tapia
1 Replies

6. Shell Programming and Scripting

Output of find command to variable?

Hi, I'd like to assign the output of the find command to a variable. What I need is to run the find command, and if it returns zero files, the program exits. so i'm trying to assign the output of the find command to the $var1 variable....and then if this is less than one, I echo a... (2 Replies)
Discussion started by: horhif
2 Replies

7. Shell Programming and Scripting

Print for loop variable in output too

Hi, This is my input file cat input chr1:100-200 chr1:220-300 chr1:300-400 Now, I would like to run a program that will take each of the input record for i in `cat input`; do program $i | wc -l;done the output will be something like 10 20 30 But, I would like to print the... (4 Replies)
Discussion started by: jacobs.smith
4 Replies

8. Shell Programming and Scripting

Use while loop - output variable

I'm very much a newbie and hence why this is going to be a stupid question. I'm attempting to create a korn shell script that pulls zone file locations and includes the copy command in the output. What? getzonedir.ksh #!/bin/ksh while read -r domain do ls */*"$domain" > $dir1 echo "cp... (5 Replies)
Discussion started by: djzah
5 Replies

9. UNIX for Beginners Questions & Answers

How do I assign the output of a command to a variable within a loop in bash?

In the else of the main if condition . else set lnk = $(readlink -f <path> | cut -d '/' -f7) echo "$lnk" if ] When I run the above on command line , the execution seems to be fine and I get the desired output. But when I try to assign it to a variable within a loop... (12 Replies)
Discussion started by: sankasu
12 Replies

LEARN ABOUT XFREE86

break

break(1)                                                           User Commands                                                          break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until  loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,  then  break  n  levels.  If  n  is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a  vari-
           able  assignment.  This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera-
           tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), sh( 1), attributes(5)

SunOS 5.10                                                          17 Jul 2002                                                           break(1)
All times are GMT -4. The time now is 05:46 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy