changes here and there

notes/a2enmod.md

@@ -0,0 +1,23 @@
+---
+title: a2enmod
+created: '2019-12-26T19:41:19.878Z'
+modified: '2019-12-28T15:45:02.321Z'
+---
+
+# a2enmod
+> enable apche2 modules
+
+## usage
+```sh
+a2enmode ssl                    # enable-modules
+
+a2enmod info.load               # /server-status
+
+a2enmod info.conf  
+# vim /etc/apach2/mods-available/info.conf => comment Require to access outside localhost
+```
+
+## see also
+- [[apache2]]
+- [[a2ensite]]
+- [[apachectl]]

notes/a2ensite a2dissite.md

@@ -0,0 +1,24 @@
+---
+title: a2ensite a2dissite
+created: '2019-12-28T15:45:07.030Z'
+modified: '2019-12-28T15:49:09.947Z'
+---
+
+# a2ensite a2dissite
+> enable or disable an apache2 site / virtual host 
+## usage
+```sh
+a2ensite vhosts_nam.com.conf   # enable site
+
+a2dissite 000-default
+
+# flags:
+# -q, --quiet         don't show informative messages.
+# -m, --maintmode     enables the maintainer mode
+# -p, --purge         purge all traces of the module in the internal state data base
+```
+
+## see also
+- [[apache2]]
+- [[a2enmod]]
+- https://manpages.debian.org/jessie/apache2/a2ensite.8.en.html

notes/ansible-playbook.md

@@ -2,11 +2,13 @@
 tags: [iac]
 title: ansible-playbook
 created: '2019-11-28T11:53:47.807Z'
-modified: '2019-11-29T11:34:33.363Z'
+modified: '2019-12-25T20:04:08.815Z'
 ---
 
 # ansible-playbook
 
+> runs ansible playbooks, executing the defined tasks on the targeted hosts.
+
 ## usage
 ```sh
 ansible-playbook --syntax-check playbook.yml

notes/ansible.md

@@ -2,19 +2,20 @@
 tags: [iac]
 title: ansible
 created: '2019-07-30T06:19:27.514Z'
-modified: '2019-11-28T11:53:44.809Z'
+modified: '2019-12-25T20:58:07.634Z'
 ---
 
 # ansible
 
-## usgae
+## usage
 ```sh
 ansible all -m ping -s    # adhoc command
 
-ansible -i hosts all -m ping                        # uses local hosts file
+ansible all -m shell -a 'cat /etc/*release'
 
-ansibele all -m shell -a 'cat /etc/*release'
+ansible -i hosts all -m ping                        # uses local hosts file
 ```
 
 ## see also
 - [[ansible-playbook]]
+- [[ssh]]

notes/apache httpd.md → notes/apache2.md

@@ -1,31 +1,23 @@
 ---
 tags: [linux]
-title: apache httpd
+title: apache2
 created: '2019-07-30T06:19:48.985Z'
-modified: '2019-11-28T11:55:22.213Z'
+modified: '2019-12-28T15:44:40.909Z'
 ---
 
-# apache httpd
-
+# apache2
 > `A Patchy Server`
 
+## usage
 ```sh
 # prerequesite
 source /etc/apache2/envvars \
 apache2 -S                      # Show settings as parsed from the config file
-```
 
-```sh
-a2enmode ssl                    # enable-modules
-
-# /server-status
-a2enmod info.load
-a2enmod info.conf  # vim /etc/apach2/mods-available/info.conf => comment Require to access outside localhost
 service apache2 restart
-
-a2ensite vhosts_nam.com.conf   # enable site
 ```
 
 ## see also
 - [[apachectl]]
+- [[a2enmod]]
 - [Generate Mozilla Security Recommended Web Server Configuration Files](https://mozilla.github.io/server-side-tls/ssl-config-generator/)

notes/apachectl.md

@@ -2,7 +2,7 @@
 tags: [linux]
 title: apachectl
 created: '2019-11-28T11:55:25.653Z'
-modified: '2019-11-29T11:34:45.404Z'
+modified: '2019-12-26T19:37:40.377Z'
 ---
 
 # apachectl
@@ -23,4 +23,4 @@ ls /etc/apache2/mods-available/		# list available modules
 ```
 
 ## see also
-- 
+- [[apache2]]

notes/arp.md

@@ -2,13 +2,13 @@
 tags: [linux, network]
 title: arp
 created: '2019-09-03T11:30:41.018Z'
-modified: '2019-09-03T12:20:06.640Z'
+modified: '2019-12-26T19:30:31.098Z'
 ---
 
 # arp
-
 > manipulates or displays the kernel's ipv4 network neighbour cache. It can add entries to the table, delete one, or display the current content.
 
+## usage
 ```sh
 arp -a    # display (all) hosts in alternative (BSD) style
 arp -e    # display (all) hosts in default (Linux) style
@@ -17,20 +17,13 @@ arp -a 159.254.171.22
 
 
 arp -i ens192   # display for interface
-```
 
-```sh
-cat /proc/net/arp
-```
 
-## arping
-```sh
-arping                          # Send ARP request to a neighbour host
-arping -I eth0 192.168.1.1      # Send ARP request to 192.168.1.1 via interface eth0
-arping -D -I eth0 192.168.1.1   # Check for duplicate MAC addresses at 192.168.1.1 on eth0
+cat /proc/net/arp
 ```
 
 ## see also
+- [[arping]]
 - [[procfs]]
 - [[ip]]
 - [[net-tools vs iproute]]

notes/arping.md

@@ -0,0 +1,19 @@
+---
+title: arping
+created: '2019-12-26T19:30:34.765Z'
+modified: '2019-12-26T19:31:33.100Z'
+---
+
+# arping
+
+## usage
+```sh
+arping                          # Send ARP request to a neighbour host
+
+arping -I eth0 192.168.1.1      # Send ARP request to 192.168.1.1 via interface eth0
+
+arping -D -I eth0 192.168.1.1   # Check for duplicate MAC addresses at 192.168.1.1 on eth0
+```
+
+## see also
+- [[arp]]

notes/atom.md

@@ -2,11 +2,12 @@
 tags: [editor]
 title: atom
 created: '2019-07-30T06:19:48.989Z'
-modified: '2019-07-30T20:37:25.171Z'
+modified: '2019-12-26T19:29:14.700Z'
 ---
 
 # atom
 
+## usage
 <kbd>cmd + shift + p </kbd>  # command palette will pop up
 
 <kbd>cmd + ;</kbd>           # open setting view
@@ -24,8 +25,8 @@ apm install remember-session
 ```
 
 ## test
-
-
 <kbd>ctl + shift + p</kbd>
 Window:Reload
 
+## see also
+- 

notes/bash braces.md

@@ -2,7 +2,7 @@
 tags: [bash]
 title: bash braces
 created: '2019-09-24T06:43:14.231Z'
-modified: '2019-09-24T06:55:26.191Z'
+modified: '2019-12-21T10:09:18.181Z'
 ---
 
 # bash braces
@@ -23,11 +23,27 @@ $(...)        # execute the command in the parens in a subshell and return its s
 COMMAND | { echo "nope"; exit 1; }
 ```
 
-## expansion
+## arithmetic expansion
 ```sh
 $((...))      # arithmetic expansion and return the result
+```
+```sh
+$((1+1))
+
+$((2*2))
+
+$((4/2))
+
+$((2**2))
+
+$((base#number))  # convert number from base to decimal
+$((2#1111))  # 15
+$((8#16))    # 14
+$((16#FF))   # 255
+
 ```
 
+## parameter expansion
 ```sh
 ${...}        # parameter expansion and return the value
 ```

notes/brew cask.md

@@ -2,12 +2,19 @@
 tags: [brew, osx, packagemanager]
 title: brew cask
 created: '2019-08-22T07:27:31.381Z'
-modified: '2019-09-23T06:41:42.008Z'
+modified: '2019-12-26T11:29:42.369Z'
 ---
 
 # brew cask
 > an `extension` to brew that allows management of `graphical applications`
 
+## usage
+```sh
+brew cask
+
+brew cask install CASK
+```
+
 ## see also
 - [caskroom.github.io/search](https://caskroom.github.io/search)
 - [[brew]]

notes/brew tap.md

@@ -2,13 +2,14 @@
 tags: [brew, osx, packagemanager]
 title: brew tap
 created: '2019-08-22T08:24:53.732Z'
-modified: '2019-09-23T06:41:29.705Z'
+modified: '2019-12-26T11:25:55.377Z'
 ---
 
 # brew tap
 
 > adds more repos to the list of formulae that brew tracks, updates, and installs from
 
+## usage
 ```sh
 brew tap                     # list tapped repositories
 

notes/chronyc.md

@@ -2,7 +2,7 @@
 tags: [linux]
 title: chronyc
 created: '2019-10-26T17:54:31.118Z'
-modified: '2019-11-29T11:36:30.999Z'
+modified: '2019-12-05T07:04:15.602Z'
 ---
 
 # chronyc
@@ -41,5 +41,7 @@ chronyc sources -v    # displays information about the current time sources that
 
 ## see also
 - [[chronyd]]
+- [[date]]
+- [[hwclock]]
 - https://blacksaildivision.com/ntp-centos
 - https://docs.fedoraproject.org/en-US/Fedora/18/html/System_Administrators_Guide/sect-Checking_if_chrony_is_synchronized.html

notes/confluent platfom.md

@@ -1,7 +1,8 @@
 ---
+deleted: true
 title: confluent platfom
 created: '2019-09-25T08:38:53.778Z'
-modified: '2019-09-25T08:42:54.923Z'
+modified: '2019-12-26T19:27:59.668Z'
 ---
 
 # confluent platfom

notes/curl.md

@@ -2,7 +2,7 @@
 tags: [curl, linux, network]
 title: curl
 created: '2019-07-30T06:19:49.032Z'
-modified: '2019-08-28T08:54:11.451Z'
+modified: '2019-12-10T14:45:10.383Z'
 ---
 
 # curl
@@ -75,4 +75,4 @@ curl --url "http://www.example.com?$(date +%s)"
 - [[curl write-out]]
 - [Extracting data from Wikipedia - loige.co](http://loige.co/extracting-data-from-wikipedia-using-curl-grep-cut-and-other-bash-commands)
 - [linux - Curl command without using cache - Stack Overflow](https://stackoverflow.com/questions/31653271/curl-command-without-using-cache)
-
+- [[wget]]

notes/date.md

@@ -2,7 +2,7 @@
 tags: [linux, osx]
 title: date
 created: '2019-07-30T06:19:49.033Z'
-modified: '2019-11-27T12:26:20.319Z'
+modified: '2019-12-05T07:04:24.041Z'
 ---
 
 # date
@@ -38,5 +38,6 @@ man strftime
 ```
 
 ## see also
+- [[hwclock]]
 - [[timedatectl]]
 - [[strftime]]

notes/diff.md

@@ -2,7 +2,7 @@
 tags: [linux]
 title: diff
 created: '2019-07-30T06:19:49.036Z'
-modified: '2019-11-28T08:12:55.515Z'
+modified: '2019-12-26T11:34:16.705Z'
 ---
 
 # diff
@@ -15,12 +15,14 @@ diff --unified file1.json file2.json
 
 diff <(sort <(md5deep -r /$1/) |cut -f1 -d' ') <(sort <(md5deep -r /$2/) |cut -f1 -d' ')
 
-diff -y <(curl -s https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash) <(cat `brew --prefix`/etc/bash_completion.d/git-completion.bash)
-```
+diff -y \
+  <(curl -s https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash) \
+  <(cat `brew --prefix`/etc/bash_completion.d/git-completion.bash)
 
-## dynamic width
-```sh
-diff -y -W $(tput cols) <(docker service inspect pp-backend_application) <(docker service inspect presseportal-backend_application)
+# dynamic width
+diff -y -W $(tput cols) \
+  <(docker service inspect pp-backend_application) \
+  <(docker service inspect presseportal-backend_application)
 ```
 
 ## see also

notes/dns records.md

@@ -1,8 +1,9 @@
 ---
+deleted: true
 tags: [dns]
 title: dns records
 created: '2019-07-30T06:19:49.039Z'
-modified: '2019-08-18T15:22:11.313Z'
+modified: '2019-12-26T19:28:03.203Z'
 ---
 
 # dns records