I need to replace a line in a configuration file and want to make sure it's done safely since it needs to be done on several systems.

The line in the file is:

*.emerg                                                 *

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I want to replace the end of line * on only lines that start with *.emerg with :omusrmsg:* so it looks like this:

*.emerg                                                 :omusrmsg:*

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This sed command seems to work, but was curious if there was a more full proof way to do it:

sed -i '/^\*.emerg/s/\*$/:omusrmsg:*/' config.conf

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Hello Experts,

I'm trying to install Java 8 on my Ubuntu 16.04 machine.

I'm very new to linux.

I'm presented with the following screens but I don't know what how to select 'Yes' to accept the agreement.

Very simple question, I know, but I really don't know.

Dear Experts

We would like to restrict users from internet (though they have login for the application server)  our objective is  users who have application login access  should still be allowed based on their mac address,  first level at our firewall check mac id allow or reject then second level application level authenticate , we are completely okay to allow the users who work from remote office which has strong firewall but the same users from their home or internet then mac id to be checked and it is not from the accepted mac id then it should deny the access . application is webbased linux , apache and mysql .below are my doubts
  I have been as asked this to implement however I am not sure the users who access this application is from their office  behind the firewall and they will have to pass their firewall in this case will it be still possible to validate user mac addess and grant or reject access from our firewall,  is this possible ,  through vpn is fine but what if vpn details are known to others and if they access from their systems hence mac restriction is been asked, can you please suggest control based on mac is it good to go or is there better solutions , thanks in advance.

Hi Experts,

      I have two containers running on dockers.  

root@ip-10-252-14-11:/home/ubuntu/workarea/sourcecode/ntdl# docker container ls
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                  NAMES
596874f0eedb        dcf3be75c970        "start"             8 days ago          Up 8 days           0.0.0.0:8009->80/tcp   iiif
91c61a7ea455        8a38b977270d        "start"             8 days ago          Up 8 days           0.0.0.0:8008->80/tcp   ntdl

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wagtail(Django)  (ntdl )application on port 8008
image server running independently on 8009
wagtail (ntdl) without zoom image not communicating with iif image server
wagtail application not talking to iiif image server

console logs details

::net ERR_CONNECTION_REFUSED for accessing iiif_image server.  

nginx is installed with wagtail ntdl application
Please help me in resolving this issue.



With many thanks,
Bharath AK

Hi,

Right now want to setup MySQL cluster and MariaDB Galeria Cluster to test the product on how well it function, so in order to prepare for it.

1. How many redhat linux nodes on testing each of this?
2. Anything else needed?
3. no shared storage is needed as actually the testing should not have shared storage and we should try horizontal scale out.
4. anything we should test on  cluster ?
5. can we use only node with 1 x network card to install ProxySQL and test it?

When we upgrade SSHD to a new version, we got with the issue of $HOME/.ssh/known_hosts, that issue on multiples connection problems, failed scripts that uses ssh protocol because SSHD daemon's keys were changed during the upgrade. We know SSH clients connects first time, and then update their known_hosts manually, but there're some scripts that fail because they're not ready to update their known_host.
My question is.
Once I have upgraded SSHD server, is there any way to keep sshd keys to avoid these client's known_host  issue?

Hi Experts,
As part of my automated verification task using ssh on remote server

1. Would like to (cat) display the content of a property file on the linux server.
2. So we dont login to each target server and check the value.
3. Instead by executing ssh user@server1 "cat /path/to/property/file" would display the content.
4. Since i also have password in the property file...would like to mask it with 'xxxxxxxx' e.g not showing the actual value.

pls help how to show the content of a file but mask only the password value

Sample file content

hostname=server1
db_sid=oracledb
db_username=scott
db_passowrd=tiger
target_script_dir=/u01/app/oracle/scripts
target_db_client_home=/u01/app/oracle/db/client_1

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Expected output display

hostname=server1
db_sid=oracledb
db_username=scott
db_passowrd=xxxxxx
target_script_dir=/u01/app/oracle/scripts
target_db_client_home=/u01/app/oracle/db/client_1

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Hello Expert,

I want to read o/p from a java process using following cron job, when i tried to use below script its o/p not written into the ScheduleDevice.log.
Could you please guide me why it throwing empty o/p  inside log.

Script  /usr/local/cronjobs/Java-Files/ScheduleDevice.sh
---------
#!/bin/bash

java -cp ".:mysql-connector (1).jar:org.eclipse.paho.client.mqttv3-1.1.0.jar" ScheduleDevice

the_output=`java -cp ".:mysql-connector (1).jar:org.eclipse.paho.client.mqttv3-1.1.0.jar" ScheduleDevice`

echo "$the_output"

while read line; do echo "LINE: '${line}'"; done < <(echo "$the_output")

crontab -l
--------------
*/5 * * * * /usr/local/cronjobs/Java-Files/ScheduleDevice.sh >> /usr/local/cronjobs/Java-Files/ScheduleDevice.log


ScheduleDevice.log  file 0/p

LINE: ''
The Java O/P is
Script Executed Successfully at Fri Jun 29 20:50:02 IST 2018

LINE: ''


Normal o/p when executing using below script in ad-hoc

[root@vps1 Java-Files]# ./ScheduleDevice.sh

The Java O/P is
Script Executed Successfully at Fri Jun 29 20:51:56 IST 2018

Before start of all threads
2018-06-29
20:51
List of pendingSchedules
Finished all threads
Finished all threads
LINE: 'Before start of all threads'
LINE: '2018-06-29'
LINE: '20:51'
LINE: 'List of pendingSchedules'
LINE: 'Finished all threads'
LINE: 'Finished all threads'

Linux admin supporting Macs.  I have a good Linux helpdesk candidate that will be require to support Macs in the future as well.  Would that be a huge knowledge curve for a good Linux admin to support Macs?  He claims almost 0% mac knowledge.
I know Linux guys very intuitive supporting Networking stuff (Cisco, etc.)  Not sure about Mac OS tho.

I would like to get a file sharing web app (running as a Docker container) operating called 'YouTransfer'. It fits what we need as a firm for a simple drag and drop document sharer with clients over the web (from our own private network) instead of large attachments being emailed. Basic details of the product are here, alond with the most basic setup instructions: http://www.youtransfer.io/

I've setup VMware's Photon OS, and as far as I can see I have got the YouTransfer container running within the Docker container environment. The bit I'm stumped on is setting up the folder locations for where the files are stored. This is probably my ignorance in the syntax for detailing paths under a Linux OS, but the specific part I don't get I've emboldened below (and tried everything I can think of to get it working):

docker run -d
-v [path_to_upload_folder]:/opt/youtransfer/uploads
-v [path_to_config_folder]:/opt/youtransfer/config
-p 80:5000
remie/youtransfer:stable

I would hope this is a simple one that someone can help me with!

Many thanks :-)

I'm looking for a tool / script to search several folders.

I want to create a .txt report with all the folders that

DO NOT CONTAIN

a file called 19.jpg?

I have access to

windows powershell, command prompts, telenet, and ssh and telnet on a mac.

The files are hosted on a qnap multimedia server which is a linux operating system.