Re: How to know when time zone has changed and when timezone will change in linux

The above command will give the list of dates when timezone changes, you can also try another command in linux.

timedatectl status

This will output all the details you need on timezone

      Local time: Wed 2023-11-22 04:26:14 EST
  Universal time: Wed 2023-11-22 09:26:14 UTC
        RTC time: Wed 2023-11-22 09:26:12
       Time zone: America/New_York (EST, -0500)
     NTP enabled: yes
NTP synchronized: yes
 RTC in local TZ: no
      DST active: no
 Last DST change: DST ended at
                  Sun 2023-11-05 01:59:59 EDT
                  Sun 2023-11-05 01:00:00 EST
 Next DST change: DST begins (the clock jumps one hour forward) at
                  Sun 2024-03-10 01:59:59 EST
                  Sun 2024-03-10 03:00:00 EDT

sachin

1

Adding LISTEN, WHISPER, BARGE to ASTERISK for SIP and PJSIP

For the purpose of this article, we will define manager as the caller who is the spying channel, agent who is the spied-on channel, and client who is the bridged channel / 3rd party. We define listen, whisper, and barge as follows:

Listen

Monitor an agents call. The manager can hear both the agent and client channels, but no-one can hear the manager.

Whisper

Whisper to the agent. The manager can hear both the agent and client channels, and the agent can also hear the manager, but the client can only hear the agent, hence “whisper.”

Barge

Barge in on both channels. The manager channel is joined onto the agent and client channels, and all parties can hear each other. Be warned, if the original agent leaves the call, the call is dropped. This is not a 3-way call.

(However you can barge in, and when comfortable, initiate a 3way call to your extension so you can continue the call without the agent. This procedure varies from client to client (soft/hard phones))

One more note: We can also provide 3-way calling [live transfer] services on the server side, however this is outside the scope of this document. Please contact us for details.

This should be placed in /etc/asterisk/extensions_custom.conf

[ext-local-custom]

;listen
exten => _*222x.#,1,Answer()
exten => _*222x.#,2,NoCDR()
exten => _*222x.#,3,Wait(1)
exten => _*222x.#,4,AGI(${FASTAGI}/outb_spy.php,listen)
;For SIP
exten => _*222x.#,5,ChanSpy(SIP/${EXTEN:4},q)
;For PJSIP (comment above line and uncomment below)
;exten => _*222x.#,5,ChanSpy(PJSIP/${EXTEN:4},q)
exten => _*222x.#,6,Hangup()

;whisper
exten => _*223x.#,1,Answer()
exten => _*223x.#,2,NoCDR()
exten => _*223x.#,3,Wait(1)
exten => _*223x.#,4,AGI(${FASTAGI}/outb_spy.php,whisper)
;For SIP
exten => _*223x.#,5,ChanSpy(SIP/${EXTEN:4},qw)
;For PJSIP (comment above line and uncomment below)
;exten => _*223x.#,5,ChanSpy(PJSIP/${EXTEN:4},qw)
exten => _*223x.#,6,Hangup()

;barge
exten => _*224x.#,1,Answer()
exten => _*224x.#,2,NoCDR()
exten => _*224x.#,3,Wait(1)
exten => _*224x.#,4,AGI(${FASTAGI}/outb_spy.php,barging)
;For SIP
exten => _*224x.#,5,ChanSpy(SIP/${EXTEN:4},qB)
;For PJSIP (comment above line and uncomment below)
;exten => _*223x.#,5,ChanSpy(PJSIP/${EXTEN:4},qw)
exten => _*224x.#,6,Hangup()

Let’s break it down:

Dialing *222970 would initiate listen on channel 970. *224401 would barge in on 401’s call speaking to both parties.

We start by finding (or adding) the ext-local-custom context, and declaring: exten => _*222x.# which will catch calls going to *222 followed by a sequence of numbers.

In ChanSpy app, there are various options you can use, we chose q (which prevents “SIP.6626″ or whatever from being spoken when you start spying.) w, which is “whisper mode”, and B which is barge. Do not get this confused with b (lowercase) which is for only joining bridged calls.

sachin

1

Re: PostgreSQL : failed: FATAL: no pg_hba.conf entry for host

First look for pg_hba.conf , you can use locate command to do so

locate pg_hba.conf

Then edit the file on your favorite editor

vi /var/lib/pgsql/9.6/data/pg_hba.conf

Add the following line to the file

host    all             all             192.168.0.1/32            md5

In order to apply changes, you must reload the service. In my case, I have pg version 9.6 so commands will be

service postgresql-9.6 reload
service postgresql-9.6 status

sachin

1

Monitor Log Files in Real Time using tail

tail Command – Monitor Logs in Real Time

As said, tail command is the most common solution to display a log file in real time. However, the command to display the file has two versions, as illustrated in the below examples.

In the first example the command tail needs the -f argument to follow the content of a file.

sudo tail -f /var/log/apache2/error.log

The second version of the command is actually a command itself: tailf. You won’t need to use the -f switch because the command is built-in with the -f argument.

sudo tailf /var/log/apache2/error.log

sachin

1

Re: Disable "Changes you made may not be saved" pop-up window

The message is the beforeunload event. And I can disable it with window.onbeforeunload = null;

sachin

1

Re: Create directory in date like structure

Create a shell script let's say move_files.sh with the following snippet

function filemove() {
    FILE_NAME=$(basename "$1")
    if [[ "$FILE_NAME" =~ ^.+\_[0-9]{8}\-.+_.+_.+-.+\.mp3$ ]]; then
        FILE_DIR=$(echo $1 | awk -F'[_-]' '{print substr($2,1,4) "/" substr($2,5,2) "/" substr($2,7,9) "/" $5 "/";}');
        echo "$FILE_NAME : >> : $FILE_DIR"
        echo "---------------------------";
        echo -e "creating directory:: \e[1;32m $FILE_DIR\e[0m";
        mkdir -p "$FILE_DIR";
        echo -e "moving file:: \e[1;32m $FILE_NAME to $FILE_DIR\e[0m";
        mv -f "$FILE_NAME" "$FILE_DIR";
    else
        echo -e "\e[1;31m ::---------------Invalid file name $FILE_NAME---------------:: \e[0m";
    fi
    echo ""
}

export -f filemove
find ./ -maxdepth 1 -type f -name "*.mp3" -exec bash -c "filemove \"{}\"" \;

Now place this file inside the directory containing mp3 files
and finally form the terminal execute the shell file
./move_files.sh

sachin

1

How to show all values when AngularJS strict filter field is empty?

I have a table which can be filtered by several columns. The filter is strict. However, it shows an empty table. How to apply a strict filter only to non-empty values? I need to show all results when a strict filter input is blank.

<table id="searchTextResults">
        <tr><th colspan="2">Strict filter</th></tr>
        <tr><th>Name</th><th>Phone</th></tr>
        <tr ng-repeat="friend in friends | filter:searchText:true">
          <td>{{friend.name}}</td>
          <td>{{friend.phone}}</td>
        </tr>
</table>

array of data,

[
    {name:'John', phone:'555-1276'},
    {name:'Mary', phone:'800-BIG-MARY'},
    {name:'Mike', phone:'555-4321'},
    {name:'Adam', phone:'555-5678'},
    {name:'Julie', phone:'555-8765'},
    {name:'Juliette', phone:'555-5678'}
]

sachin

1

Install Asterisk 18 on CentOS 8

Asterisk-installation

A little house keeping before installation.

yum update
yum groupinstall "Development Tools"
sed -i 's/\(^SELINUX=\).*/\SELINUX=disabled/' /etc/sysconfig/selinux
sed -i 's/\(^SELINUX=\).*/\SELINUX=disabled/' /etc/selinux/config
sestatus
reboot
sestatus
sudo yum install httpd
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --zone=public --permanent --add-service=http
firewall-cmd --zone=public --permanent --add-service=https
firewall-cmd --reload
sudo systemctl enable httpd.service
sudo systemctl start httpd.service

Installing DependenciesPermalink

yum install -y epel-release dmidecode gcc-c++ ncurses-devel libxml2-devel make wget openssl-devel newt-devel kernel-devel sqlite-devel libuuid-devel gtk2-devel jansson-devel binutils-devel

dnf --enablerepo=PowerTools install libedit-devel
dnf --enablerepo=PowerTools install libsrtp
dnf --enablerepo=PowerTools install libsrtp-devel

yum install -y libedit-devel libsrtp libsrtp-devel

Install Asterisk 18

cd /usr/src/

wget http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-18-current.tar.gz

tar -zxvf asterisk-18-current.tar.gz
mv asterisk-18.3.0/ asterisk/
cd asterisk

contrib/scripts/install_prereq install

./configure --libdir=/usr/lib64 --with-pjproject-bundled --with-crypto --with-ssl=ssl --with-srtp --with-jansson-bundled
make menuselect
make
make install
make install-headers (optional if requires. Development headers are only installed if the “install-headers” target of make is done.)
make samples
make config

Start at server restart

ldconfig

sudo systemctl start asterisk

Entering into command line of asterisk

asterisk -rvv

core show help
exit

Configure extensions.conf and pjsip.conf

cd /etc/asterisk
mv extensions.conf extensions.sample
mv sip.conf sip.sample
mv pjsip.conf pjsip.sample

Creating a basic Dial Plan by editing extensions.conf

vi extensions.conf

[public]
exten = 100,1,Goto(hello-world,s,1)
[default]
[hello-world]
exten = s,1,Answer()
same = n,Wait(1)
same = n,Playback(hello-world)
same = n,Hangup()

Create SIP members in pjsip.conf

vi pjsip.conf

[transport-udp]
type=transport
protocol=udp
bind=0.0.0.0

[7000]
type=endpoint
context=public
disallow=all
allow=ulaw
auth=7000
aors=7000

[7000]
type=auth
auth_type=userpass
password=7000
username=7000

[7000]
type=aor
max_contacts=1

asterisk -rx "core restart now"

asterisk -rvvvvv

sachin

1

Best Of

Listen

Whisper

Barge

tail Command – Monitor Logs in Real Time

Asterisk-installation

A little house keeping before installation.

Installing DependenciesPermalink

Install Asterisk 18

Creating a basic Dial Plan by editing extensions.conf

Create SIP members in pjsip.conf