Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Ssh on ping result?
Top Forums Shell Programming and Scripting Ssh on ping result? Post 303026423 by Corona688 on Tuesday 27th of November 2018 01:48:14 PM
Old 11-27-2018
Quote:
Originally Posted by MuntyScrunt
I've actually had some time to look into this today, and with 'some help' from google I think I have it sorted out. Or will when I get the wrong lines right!

While I'm at it, could someone please explain why:
Code:
-# command="user@192.168.xxx.xxx"
-#*echo $command | cut -d'@' -f1
-# user

but-
Code:
-# command="user@192.168.xxx.xxx"
-# user=$command | cut -d'@' -f1
-# echo $user

gives no output?
A pipe | captures the output of the previous command.

What gets printed when you type echo $command ? It prints user@192.168.xxx.xxx

What gets printed when you type user=$command ? Nothing.

There is basically no reason to ever use echo "line" | cut, that's inefficient and the shell has better builtins to do it.

Try
Code:
$ user="username@192.168.xxx.xxx"
$ echo "${user/@*/}"

192.168.xxx.xxx

$

If your shell doesn't have ${VAR/SUB} type substitution, try "${user##*@}" instead.
Last edited by rbatte1; 11-28-2018 at 01:53 PM.. Reason: Added CODE tags in the quote to match the update to the original post
 

10 More Discussions You Might Find Interesting

1. Linux

Can't SSH / ping Linux box !!!

I have a linux box build11 which can be pinged from build18 (Windows) box. And we can only login to the box (using SSH) from build18 box. Plz help to characterize the problem, network, DNS, DHCP, etc (or whatever which I am unsure) Any idea what may be the reason ? :confused: Thanks in... (4 Replies)
Discussion started by: csaha
4 Replies

2. Shell Programming and Scripting

Problem storing SSH result in a variable

i have this SSH command which runs perfectly on command prompt in sunOS ssh -o Port=${portno} ${uname}@${server} find ${dir_path} -name '***' output : /usr/local/home/*** My problem is when i run same command in my script #!/usr/bin/ksh res=`ssh -o Port=${portno} ${uname}@${server}... (1 Reply)
Discussion started by: prash184u
1 Replies

3. Solaris

could not ssh and ping

hi , i cannot ssh to a server , i have restarted the ssh instances also. and i cannot ping to the server.. any ideas ..plz (5 Replies)
Discussion started by: jegaraman
5 Replies

4. Solaris

could not ssh and ping

Hi, I have a solaris 8 machine. I see ssh is running in the machine sbnismwp2# ps -aef | grep ssh root 947 945 0 04:34:45 ? 0:00 /export/opt/SSHtecagt/sbin/ssh-mgmt-sysmonitor root 945 1 0 04:34:45 ? 0:00 /export/opt/SSHtecagt/sbin/ssh-mgmt-agent... (11 Replies)
Discussion started by: jegaraman
11 Replies

5. Shell Programming and Scripting

prevent ssh from executing result in shell

Hi, I am writing a script on Solaris 10 and want to execute a remote ssh command. Normally this command should just return the value 0000000000002356 but when using ssh it seems it is passing the result to the shell to execute. ssh root@10.5.112.145 `/usr/bin/nawk -F\, '$1=="USG" && $2=="01"... (3 Replies)
Discussion started by: borderblaster
3 Replies

6. Solaris

Ping = no, SSH = eventually. Next step?

I have a Solaris 9 server that does not return a ping. When I try to log in via SSH I eventually get in. I am logged in now. I know this is a wide open question, but can you recommend some things I should check? . Thanks in advance, ~R (2 Replies)
Discussion started by: abstractrick
2 Replies

7. Shell Programming and Scripting

Perl : code on ping showing difference result

Hi all, I am using the below code to ping a code and print whehter the connection is successful or not. use Net::Ping; $p = Net::Ping->new(); my $host = "x.x.x.x"; # print "$host is alive.\n" if $p->ping($host); if ($p->ping($host,3)) { print... (0 Replies)
Discussion started by: scriptscript
0 Replies

8. Shell Programming and Scripting

Ping result talking too long

Hello all, I am writing a script that pings various machines to check connectivity. If a machine is available, the prompt returns a result immediately: root@ops # ping 172.21.5.5 172.21.5.5 is alive BUT if a machine is Down , the reply takes a long time to come. The issue is I want to... (1 Reply)
Discussion started by: Junaid Subhani
1 Replies

9. AIX

Not able to ssh or ping a server

Hi, Earlier I was able to ssh /ping the server but now it just hangs Please suggest how to troubleshoot. Best regards, Vishal (4 Replies)
Discussion started by: Vishal_dba
4 Replies

10. UNIX for Advanced & Expert Users

Cant ssh, but ping works

I cant ping to some of my machines, but ping works. I attach screenshots. Port is open and it is 22. I can't figure out why i cant access. https://www.unix.com/attachments/unix-for-advanced-and-expert-users/7492d1541541072-cant-ssh-but-ping-works-sshlisten-jpg... (17 Replies)
Discussion started by: tomislav91
17 Replies

LEARN ABOUT DEBIAN

guards

GUARDS(1)						User Contributed Perl Documentation						 GUARDS(1)

NAME

       guards - select from a list of files guarded by conditions

SYNOPSIS

       guards [--prefix=dir] [--path=dir2:dir2:...] [--default=0|1]	   [-v|--invert-match] [--list|--check] [--config=file]        symbol ...

DESCRIPTION

       The script reads a configuration file that may contain so-called guards, file names, and comments, and writes those file names that satisfy
       all guards to standard output. The script takes a list of symbols as its arguments. Each line in the configuration file is processed
       separately. Lines may start with a number of guards. The following guards are defined:

	   +xxx Include the file(s) on this line if the symbol xxx is defined.

	   -xxx Exclude the file(s) on this line if the symbol xxx is defined.

	   +!xxx Include the file(s) on this line if the symbol xxx is not defined.

	   -!xxx Exclude the file(s) on this line if the symbol xxx is not defined.

	   - Exclude this file. Used to avoid spurious --check messages.

       The guards are processed left to right. The last guard that matches determines if the file is included. If no guard is specified, the
       --default setting determines if the file is included.

       If no configuration file is specified, the script reads from standard input.

       The --check option is used to compare the specification file against the file system. If files are referenced in the specification that do
       not exist, or if files are not enlisted in the specification file warnings are printed. The --path option can be used to specify which
       directory or directories to scan.  Multiple directories are separated by a colon (":") character. The --prefix option specifies the
       location of the files.

AUTHOR

       Andreas Gruenbacher <agruen@suse.de> (SuSE Linux AG)

perl v5.14.2							    2012-03-04								 GUARDS(1)
All times are GMT -4. The time now is 11:01 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy