what is difference between below commands


$ cd xyz

it says no such file or directory

even
$ cd /xyz
says no such file or directory

where as when i say

$ cd /xyz/
it goes to xyz directory though

what is use or importance of /  and / at the beginning and end?

please advise

Hello, I'm curious, hence I ask you; Is there such a "recent college engineer", either software or hardware, or one that studied both, who would meet all of these requirements:
embedded Linux based data telecommunications system/ VoIP/SIP
satellite network application and
embedded software/ Firmware/embedded systems
automation scripting
Python
Java
Linux operating system/Linux Network expertise
Unix shell scripting
WEB GUI test automation
DO-178B experience
Satellite communication experience
Telecommunication experience/PBX switching systems

Any comments?
Do companies expect to find an "expert" engineer with all this knowledge?
thanks

# systemctl start dhcpd
Job for dhcpd.service failed because the control process exited with error code. Se e "systemctl status dhcpd.service" and "journalctl -xe" for details.

I am trying to sync the following repos.

http://mirror.centos.org/centos/7/os/x86_64/

I created a repo in satellite and when I tried to sync its not downloading any packages. I see the meta data processing message came up and suddenly it went to 100% .  I don't see any packages downloaded.

Hi,

I am fed up with putty with basic options.

Any better tools or IDEs to check logs or to grep unix/linux boxes.

Where  i can download secure ftp and how much is fees?
any advanced putty IDE there
any good free IDE accepted by industry.

please advise

Dear Experts,

How to copy or transfer a file from one Linux server to multiple Linux server in same network from a single cmd or script ? It should be a single line cmd for copy my file to multipal servers, don't want to use separate line for every server.

for example:
scp report_zonal 192.168.7.111 192.168.7.112 192.168.7.113 192.168.7.114:/home/Zonal/Desktop

i dont know it is possible or any other way to make it possible, please suggest

Currently i am using this method, it is working also, but i don't want to use this process.

[root@200 ftp]# cat FileTransfer.sh
#!/bin/bash
# transfer file to server
cd /root/
#DC Zonal
scp report_zonal 192.168.7.111:/home/Zonal/Desktop
scp report_zonal 192.168.7.112:/home/Zonal/Desktop
scp report_zonal 192.168.7.113:/home/Zonal/Desktop
scp report_zonal 192.168.7.114:/home/Zonal/Desktop

Hi All!!

Is it possible to isolate a small linux box computer from the rest of my home network but still have internet capabilities. My home network connects to a single router which has various devices connected to it, such as Windows machines and other devices (not many but some).

The ideas is, if the linux PC or other devices are compromised, it will not affect the others. I would also like to to port-forward the linux box for remote use. So by isolating it from the network i can minimise the risks if any.

I understand that the likelihood of Linux devices infecting Windows (or vice versa) is rare but I'd still like to achieve this.

After doing research, i have come up with the below...

• Installing/Configuring A/V on the Linux Terminal
• Using IPtables to restrict other devices accessing. - Complete newbie to this but would appreciate some guidance.
• Different IP Subnets.

I would very much appreciate it if someone would be able to assist me in understanding and designing a solution.

Thank you!!

I have a Asus RT-N18U router. (but can buy another one), with DD-WRT firmware DD-WRT v3.0-r32170 std (06/01/17)
I want:
Hotspot for Restaurants that:
-People connect (no password) to WIFI
-they get a webpage (can be on router or in internet)
-webpage ask for emailadress
-once introduced emailadress and send it (to a server in internet with its MAC address) they get granted lets say 2 hours of internet
-after 2 hours they have to come back to the login page again (or better they get blocked for 10 hours with error webpage and after to login page again)
-no other service (not free and not payed) should be used

-the router mentioned offers dd-wrt with onboard radiusserver (I tried it and works), chillispot or nocatsplash (both I didn't get to work)
The router should be configured (WAN) as DHCP automatic conection and he should use his own network with his own DHCP server (so it is easy to connect him to an existing network)

I need somebody who configures the router and tell me how the configuration works. (where are modifyable files)

Dear Experts,

We have automout enabled for our /home directory, Whenever a user login to the servers automout triggers NFS mount to use to mount  home directory[/auto/home/<username>] in the servers.  The NFS servers hosted on Netapp storage device.

Below is the logs from messages file:
automount[25639]: mount(nfs): nfs: mount failure 10.x.x.x:/vol/m1_ldap_home/localhome/sivakumar on /auto/home/sivakumar
Jun  8 09:20:30 xxxxxxxxx automount[847]: attempting to mount entry /auto/home/sivakumar
Jun  8 09:20:51 xxxxxxxxx automount[25644]: >> mount: RPC: Timed out.

My Observation:

The NFS client servers which NOT in the same network where NFS Server is , having above problems.

I need to know , what angle i need to troubleshoot this issue, how to resolve and what is solution?

Thanks in advance.

Sk..

I have one 12U1 SLES machine in which i want to open an port no 31015 for SAP HANA but unable to.

Netstat -tulpn also not showing LISTEN to this port .

I have also tried it with Yast2 firewall advance option but dont same problem

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      2475/sshd
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      2169/master
tcp        0      0 0.0.0.0:51013           0.0.0.0:*               LISTEN      2341/sapstartsrv
tcp        0      0 0.0.0.0:51014           0.0.0.0:*               LISTEN      2341/sapstartsrv
tcp        0      0 0.0.0.0:1128            0.0.0.0:*               LISTEN      2295/sapstartsrv
tcp        0      0 0.0.0.0:1129            0.0.0.0:*               LISTEN      2295/sapstartsrv
tcp        0      0 :::22                   :::*                    LISTEN      2475/sshd
tcp        0      0 ::1:25                  :::*                    LISTEN      2169/master
udp     5376      0 0.0.0.0:68              0.0.0.0:*                           1308/wickedd-dhcp4


telnet IP 31015
gives keep trying then unable to reach

telnet working for other ports like ssh and 1128 etc.

please help

redhat linux 7.3 i did disable ipv6 but still its shows.

tcp6       0      0 :::80                   :::*                    LISTEN      638/httpd
tcp6       0      0 :::22                   :::*                    LISTEN      647/sshd
tcp6       0      0 :::443                  :::*                    LISTEN      638/httpd