Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: For Loop in shellscript - Printing Output for every iteration
Top Forums Shell Programming and Scripting For Loop in shellscript - Printing Output for every iteration Post 302741241 by DGPickett on Friday 7th of December 2012 04:53:19 PM
Old 12-07-2012
Well, $? has a short shelf life, as everything under the sun sets it, so what works on a command line does not work on slightly more complex command line. It is commonly used something like:
Code:
some_command with_args_and_redirect
ret=$?
if [ $ret = 0 ]
then
 some action
fi

I like the pipes and all shell:
Code:
lsvg -o | while read VG
do
 lsvg -l $VG | while read x1 x2 x3 x4 x5 x6 x7 x8
 do
  case "$x7" in
  (closed)
     echo $VG $x6 Closed
    ;;
  (*)
     echo $VG $x6 OK
    ;;
  esac
 done
done

This User Gave Thanks to DGPickett For This Post:
chandu123
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

New iteration of for-loop without incrementing?

Another question, is it possible to, in a for-loop incrementing until it reaches a certain number, to have it loop again without incrementing? Just have it drop what it is doing when it reaches this command and start again at the same number it was at? I know I could make a while loop and just... (0 Replies)
Discussion started by: jeriryan87
0 Replies

2. Shell Programming and Scripting

Pick up the return code for every iteration and display the result only once in loop.

Hi All, I amlearning UNIX scripting. I have a small query. I would be thankful if any one helps me out. I have a below piece of code which delets the files. If file dosent have the permissions to delete a particular file I have used 2>>operator to track the error code. But my objective is... (1 Reply)
Discussion started by: manas6
1 Replies

3. Shell Programming and Scripting

howto stop loop iteration

I wonder how to stop further loop iterations when conditions gets false e.g. This file.txt contains the following structure : 1 2 3 4 5 6 7 8 9 10 How to stop iteration when if statement gets false ? for n in `cat file.txt` do if (( n<=5 )) (1 Reply)
Discussion started by: presul
1 Replies

4. Shell Programming and Scripting

for loop iteration and shell programming startup

question :how can i iterate to next item in for loop with the loop e.g for i in `cat abc.txt` do echo $i // this will display first line i=$i+1; // this doesnt work for me. echo $i; //this will display secound line done question: is my approach to manipulate text good? I have... (3 Replies)
Discussion started by: kashif_islam
3 Replies

5. Shell Programming and Scripting

Do something only that last iteration of loop

I have a script with logic like: my_function() { if mkdir $1 mkdir mydir_${2} else do something else fi } read in list of items while read list do my_function $list `date` done so basically it will make a directory for every name in the list and create a directory with the... (6 Replies)
Discussion started by: glev2005
6 Replies

6. Shell Programming and Scripting

Getting the iteration count in WHILE LOOP

bash in RHEL 6.4 I have a requirement in which I want to get the iteration count from a WHILE LOOP. The below mentioned simple script test.sh works fine. In the below script, the WHILE loop will iterate every 5 seconds infinitely until it greps the string BASKETBALL from /tmp/somestring.txt... (6 Replies)
Discussion started by: John K
6 Replies

7. Shell Programming and Scripting

While loop is causing ssh command to exit from script after first iteration.

I am trying to check multiple server's "uptime" in a loop over "ssh". When I execute multiple ssh commands with hard coded servernames script is executing fine. But when I pass server names using while loop, script is exiting after checking first server's status, why? # serverList... (8 Replies)
Discussion started by: kchinnam
8 Replies

8. Shell Programming and Scripting

Loop iteration with two variables

Hello, I have been stuck on this for some time and invested many hours trying to find a solution. I am trying to either loop through two variables or or two arrays and not sure how to do it. I am limited to ksh only, and don't have the ability to do a foreach, or for i AND for j etc...I... (19 Replies)
Discussion started by: Decoy Octopus88
19 Replies

9. Shell Programming and Scripting

While loop is running only for the first iteration

Hello, I've written a script to automate encoding of all the MP4 files in a directory (incl. subdirectories). But unfortunately it's running for the first MP4 file only. My machine details: root@Ubuntu16:~# uname -a Linux Ubuntu16 4.10.0-28-generic #32~16.04.2-Ubuntu SMP Thu Jul 20 10:19:48... (2 Replies)
Discussion started by: prvnrk
2 Replies

10. Shell Programming and Scripting

Printing the output of sed using a loop

So I am writing a bash script that will search a file line by line for unix timestamps, store all of the timestamps into an array, then check how many of those timestamps were created within the last hour, and finally increment a counter every time it finds a timestamp created within the last hour.... (6 Replies)
Discussion started by: jsikarin
6 Replies

LEARN ABOUT DEBIAN

irsend

IRSEND(1)							   User Commands							 IRSEND(1)

NAME

       irsend - basic LIRC program to send infra-red commands

SYNOPSIS

       irsend [options] DIRECTIVE REMOTE CODE [CODE...]

DESCRIPTION

       Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such
       as TV boxes, HiFi sets, etc.

       DIRECTIVE can be:
	  SEND_ONCE	    - send CODE [CODE ...] once
	  SEND_START	    - start repeating CODE
	  SEND_STOP	    - stop repeating CODE
	  LIST		    - list configured remote items
	  SET_TRANSMITTERS  - set transmitters NUM [NUM ...]
	  SIMULATE	    - simulate IR event

       REMOTE is the name of a remote, as described in the lircd configuration file.

       CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file.

       NUM is the transmitter number of the hardware device.

       For the LIST DIRECTIVE, REMOTE and/or CODE can be empty:

	  LIST	 ""    ""   - list all configured remote names
	  LIST REMOTE  ""   - list all codes of REMOTE
	  LIST REMOTE CODE  - list only CODE of REMOTE

       The SIMULATE command only works if it has been explicitly enabled in lircd.

       -h --help
	      display usage summary

       -v --version
	      display version

       -d --device
	      use given lircd socket [/var/run/lirc/lircd]

       -a --address=host[:port]
	      connect to lircd at this address

       -# --count=n
	      send command n times

EXAMPLES

	  irsend LIST DenonTuner ""
	  irsend SEND_ONCE  DenonTuner PROG-SCAN
	  irsend SEND_ONCE  OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP
	  irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3
	  irsend SEND_STOP  OnkyoAmpli VOL-DOWN
	  irsend SET_TRANSMITTERS 1
	  irsend SET_TRANSMITTERS 1 3 4
	  irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S"

FILES

       /etc/lirc/lircd.conf
	      Default lircd configuration file.  It should contain all the remotes, their infra-red codes and the corresponding timing	and  wave-
	      form details.

DIAGNOSTICS

       If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics:
       "irsend: could not connect to socket"
       "irsend: Connection refused" (or "Permission denied").

SEE ALSO

       The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory.

       lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org.

irsend 0.9.0-pre1						   October 2010 							 IRSEND(1)
All times are GMT -4. The time now is 09:56 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy