many fixes

AWS/create_own_ami.txt

@@ -0,0 +1,67 @@
+============================
+Create own AMI from instance
+============================
+
+Tested on AWS Ubuntu Xenial ``create-own-ami.sh``::
+
+
+    #!/bin/bash
+
+    set -e
+
+    instance_id=$(ec2metadata --instance-id)
+    instance_name=$(aws ec2 describe-tags --filters Name=resource-id,Values=$instance_id Name=key,Values=Name --query Tags[].Value --output text)
+
+    if [ -z $instance_name ]; then
+	    ami_name="ec2-$instance_id-auto-created"
+    else
+	    ami_name="$instance_name-auto-created"
+    fi
+
+    ami_description="AMI auto created by script from instance $instance_id"
+
+    function delete_snapshots_of_ami() {
+	    array=($(aws ec2 describe-images --filters "Name=image-id,Values=$1" --query Images[0].BlockDeviceMappings[].Ebs.SnapshotId --output text))
+
+	    for i in "${array[@]}"
+	    do
+		    aws ec2 delete-snapshot --snapshot-id $i
+		    echo 'Deleted snapshot $i'
+	    done
+
+    }
+
+
+    function delete_ami() {
+	    ami_id=$1
+
+	    snapshots=($(aws ec2 describe-images --filters "Name=image-id,Values=$ami_id" --query Images[0].BlockDeviceMappings[].Ebs.SnapshotId --output text))
+
+	    aws ec2 deregister-image --image-id $ami_id
+	    echo "Deregistered AMI $ami_id"	
+
+	    sleep 5.0
+
+	    for snap_id in "${snapshots[@]}"
+	    do
+		    aws ec2 delete-snapshot --snapshot-id $snap_id
+		    echo "Deleted snapshot $snap_id"
+	    done
+    }
+
+
+    ami_last_id=$(aws ec2 describe-images --filters "Name=name,Values=$ami_name" --query Images[0].ImageId --output text)
+
+    if [ "$ami_last_id" = "None" ]; then
+	    echo "Not exist previous AMI. Nothing to delete."
+    else
+	    echo "Start deleting previous AMI $ami_name with id $ami_last_id"
+	    delete_ami $ami_last_id
+
+	    echo "Previous AMI and associated snapshots were deleted."
+    fi
+
+    echo "Start creating AMI $ami_name from $instance_id"
+    ami_new_id=$(aws ec2 create-image --instance-id $instance_id --name "$ami_name" --description "$ami_description" --output text)
+
+    echo "Created new AMI $ami_new_id"

JBOSS_EAP/jboss_eap.txt

@@ -6,14 +6,15 @@ JBOSS EAP
 #
 # RedHat Enterprise Linux server 7.2
 
+::
 
-sudo yum update
-sudo yum install java-1.8.0-openjdk
+    sudo yum update
+    sudo yum install java-1.8.0-openjdk
 
-java -jar jboss-eap-7.0.0-installer.jar -console
+    java -jar jboss-eap-7.0.0-installer.jar -console
 
-# auto install
-# java -jar jboss-eap-7.0.0-installer.jar auto.xml
+    # auto install
+    # java -jar jboss-eap-7.0.0-installer.jar auto.xml
 
 sudo yum install nano
 

MacOS/mac_os.txt

@@ -2,6 +2,30 @@
 Mac OS instructions
 ===================
 
+Turn on performance mode for macOS Server (OS X El Capitan 10.11 and later). Provides extended system limits (maxproc, etc.)::
+
+    # check
+    nvram boot-args
+
+    # turn on (reboot after turn on)
+    sudo nvram boot-args="serverperfmode=1 $(nvram boot-args 2>/dev/null | cut -f 2-)"
+
+
+    # turn off (reboot after turn off)
+    sudo nvram boot-args="$(nvram boot-args 2>/dev/null | sed -e $'s/boot-args\t//;s/serverperfmode=1//')"
+
+
+Delete a local account::
+
+    dscl localhost delete /Local/Default/Users/<user>
+    rm -rf /Users/<user>
+
+
+Show listen ports::
+
+    sudo lsof -PiTCP -sTCP:LISTEN
+
+
 Manipulating OS X login items from command line
 
 - https://hamstergene.github.io/post/editing-osx-login-items-cmdline/
@@ -224,6 +248,11 @@ Install some app::
 System limits
 -------------
 
+.. note::
+
+    To increase system limits turn on performance mode
+
+
 ::
 
     launchctl limit

MacOS/mac_programming.txt

@@ -9,6 +9,16 @@ https://en.wikibooks.org/wiki/AppleScript_Programming/System_Events
 
 Loop (repeat) - http://alvinalexander.com/apple/applescript-for-loop-while-loop-examples
 
+Get all UI elements::
+
+    set t1 to get every UI element
+    log "---\nGet every UI element\n---"
+    repeat with i in t1
+         log i
+         log "\n"
+    end repeat
+    log "---\nEnd\n---"
+
 
 Show all processes of application::
 

awk.txt

@@ -6,6 +6,8 @@ awk - команда контекстного поиска и преобразо
 
 cat /proc/*/stat | awk '{print $1 " " $2}'
 
+awk -F '<separator>' '{print $2}'
+
 http://linuxgeeks.ru/awk.htm
 https://ru.wikipedia.org/wiki/AWK
 https://linuxconfig.org/learning-linux-commands-awk

bash.txt

@@ -5,6 +5,19 @@ BASH
 
 http://talk.jpnc.info/bash_lfnw_2017.pdf
 
+BASH if grep ixists statement::
+
+    if grep --quiet 'text' /path/to/file; then
+      echo exists
+    else
+      echo not found
+    fi
+
+
+Get path to script which run::
+
+    SCRIPT_PATH="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
 
 Bash get last line from a variable::
 

git.txt

@@ -4,6 +4,11 @@ Git
 
 https://git-scm.com/book/ru/v2
 
+Avoid **Are you sure you want to continue connecting (yes/no)** on connect via ssh keys::
+
+    # bitbucket
+    ssh-keyscan -t rsa bitbucket.org >> ~/.ssh/known_hosts
+
 
 Delete credentials from GIT repository [rus] - https://the-bosha.ru/2016/07/01/udaliaem-sluchaino-zakomichennye-privatnye-dannye-iz-git-repozitoriia/
 

install-bbb-auto.txt

@@ -2,10 +2,11 @@
 Install BBB auto
 ================
 
-::
+BigBlueButton 0.81 on Debian 7 Wheezy
+-------------------------------------
 
-    #BigBlueButton 0.81 in Debian 7 Wheezy
-    ##
+::
+
     aptitude install sudo
     echo "deb http://ubuntu.bigbluebutton.org/lucid_dev_081/ bigbluebutton-lucid main" | sudo tee /etc/apt/sources.list.d/bigbluebutton.list
     #
@@ -104,7 +105,7 @@ Install BBB auto
     #
     #
     sudo aptitude -f install build-essential libssl-dev libcurl4-openssl-dev libreadline-dev libxslt-dev libxml2-dev libreadline5 libyaml-0-2
-    #----------����� � ��� �����------------
+    #
     wget https://bigbluebutton.googlecode.com/files/ruby1.9.2_1.9.2-p290-1_amd64.deb
     sudo dpkg -i ruby1.9.2_1.9.2-p290-1_amd64.deb
     sudo aptitude -f install

linux_commands.txt

@@ -2,10 +2,20 @@
 Linux commands
 ==============
 
+Sleep for 1 second between each xargs command::
+
+    ps aux | awk '{print $1}' | xargs -I % sh -c '{ echo %; sleep 1; }'
+
+
 Empty pagecache, dentries and inodes::
 
     # run as root
-    free -h && sync && echo 3 > /proc/sys/vm/drop_caches && free -h
+
+    # pagecache
+    free -h && echo && sync && echo  > /proc/sys/vm/drop_caches && free -h 
+
+    # (not recomended) pagecache, dentries and inodes
+    free -h && echo && sync && echo 3 > /proc/sys/vm/drop_caches && free -h
 
 
 Flush swap::
@@ -256,6 +266,11 @@ Remove the line which contains string::
     sed -i.bak '/pattern to match/d' <file>
 
 
+Replace whole line started by::
+
+    sed "s/start_of_line.*/new_line_content/g"
+
+
 Find
 ----