Sponsored Content
Full Discussion: Break command
Top Forums Shell Programming and Scripting Break command Post 302279852 by Lakris on Saturday 24th of January 2009 08:14:21 AM
Old 01-24-2009
Hello there,
I think You should consider using ping with the count option, otherwise it will continue pinging forever and You will never get out of the loop. Example:

Code:
ping -c 1 host

And after that, read the return value ($?) if You need to take action if it fails or is successful. Another example:

Code:
lakris@landet:~/projekt$ ping -c 1 localhost; echo $?
PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.039 ms

--- localhost ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.039/0.039/0.039/0.000 ms
0
lakris@landet:~/projekt$ ping -c 1 unknownhost; echo $?
ping: unknown host unknownhost
2
lakris@landet:~/projekt$

Regards,
/Lakris
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Insert line break in vi's command mode

Hi, When working in vi, the CTRL+j command for merging lines is very convenient. Is there an equivalent for splitting them (inserting a line break)? I often find myself pressing "i" + "return" + "esc", which I find a bit lengthy. Thanks in advance! (3 Replies)
Discussion started by: Skogsmulle
3 Replies

2. Shell Programming and Scripting

break out of 'if'

is it possible? because i still need to keep on reading even though i don't want to read that particular line (7 Replies)
Discussion started by: finalight
7 Replies

3. UNIX for Dummies Questions & Answers

Can anyone break down this find command for me?

find . "(" -name a.out -o -name core ")" -exec rm {} \; Specifically What files are trying to be found What does the -o do in this command What is the result if the files are found What does the command do if the files are not found What does the . after the word find mean thanks in... (1 Reply)
Discussion started by: knp808
1 Replies

4. Solaris

Break command on rsc of sunfire v890 server

Hi Gurus I would like to know whether break command always work well means take the system to ok> prompt. Its depend upon sever model also. As I am facing problem when ever my system ( Sunfire V890 ) having Solaris 10 OS & oracle RAC on it goes to hang state then I run the break command from... (6 Replies)
Discussion started by: girish.batra
6 Replies

5. Shell Programming and Scripting

how to break cat

Greetings. cat $name$telephonenumber >> telephonebook.txtI would like to break cat with the command 'break'. Pretty hard to understand huh? So to clarify it: echo "If you want to stop adding datas to your telephonebook please type 'break' if #this part is probably not good then echo... (2 Replies)
Discussion started by: buddhist
2 Replies

6. Shell Programming and Scripting

break: cannot break

hi guys I am working on a menu for linux... some basic stuff. but I have an issue. I got 1 server where something is working and the same thing does not work in the same way in another linux box Basically I am simulating a command line where user insert some commands and to end and go back... (7 Replies)
Discussion started by: karlochacon
7 Replies

7. Shell Programming and Scripting

BASH: Break line, read, break again, read again...

...when the lines use both a colon and commas to separate the parts you want read as information. The first version of this script used cut and other non-Bash-builtins, frequently, which made it nice and zippy with little more than average processor load in GNOME Terminal but, predictably, slow... (2 Replies)
Discussion started by: SilversleevesX
2 Replies

8. Shell Programming and Scripting

How to break the line to the one above?

Hello everyone! I'm trying to make the below file1 look like file2, can anyone help? Basically I just hit backspace on every line that starts with a number. Thanks! file1: THIS#IS-IT1 4 THIS#IS-IT2 3 THIS#IS-IT3 2 THIS#IS-IT4 1 Result > file2: (4 Replies)
Discussion started by: demmel
4 Replies

9. Solaris

Can't use 'break' command, Can't access 'ok' prompt.

Hi I have A Sun Ultra Enterprise 450 server, it has Solaris installed on it. I have A serial terminal hooked up to it (nullmodem cable plugged into serial port 1 on the box, and the other end plugged into the serial port of A laptop (NEC Versa M300)) The laptop is running Ubuntu 12.04.2... (3 Replies)
Discussion started by: SomeoneTwo
3 Replies

10. Shell Programming and Scripting

Break in for loop

in my python script i have loop like below: for item in itemlist: if <condition>: <code> else: <code> if <condition>: if <condition>: <code> else: for type in types: if... (1 Reply)
Discussion started by: ctrld
1 Replies
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 04:58 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy