WH-1000XM3 failing to pair with macOS (it is not even discoverable in bluetooth settings)

simple steps does not work https://helpguide.sony.net/mdr/wh1000xm3/v1/en/contents/TP0001867146.html

To start pairing Headphones , press power button for several seconds (about 7).

I found solution that helped me:
https://us.community.sony.com/s/question/0D50B00005kn3GA/unable-to-pair-wh1000xm3-with-mac-mojave-os-sony-support-docs-only-reference-earlier-versions-of-mac-operating-systems-am-i-out-of-luck?language=en_US#0054O000007uGjsQAE

Quote from forum:

====

Hello, I think I have the solution. this is for the latest version of Mojave. it's in this macworld article: https://www.macworld.co.uk/how-to/mac/fix-bluetooth-mac-3682642/ - this is the one that worked for me, but they have other options if it doesn't:

Using Finder

1. Open Finder.
2. Click Go.
3. Click Go to Folder.
4. Type in: /Library/Preferences
5. Click Go.
6. Find the com.apple.Bluetooth.plist file.
7. Move the plist file to the Trash.
8. Click Go > Go to Folder
9. Type in: ~/Library/Preferences/ByHost
10. Click Go.
11. This time find com.apple.Bluetooth.???.plist file (this will be made up of some random letters) and move it to the Trash.
12. Now restart your Mac - it will automatically generate new Bluetooth plist files the next time you turn Bluetooth off and on again.

After I did this it took a few minutes, at first all the bluetooth commands were just digits but after about 1 minute the headphones showed up and now they work. 

====

to initiate pairing I pressed power button for several seconds (about 7 seconds).

Firefox multi-line tabs

Enable loading of styles from disk - https://winaero.com/blog/enable-loading-userchrome-css-usercontent-css-firefox/ (Set at "about:config" page the option toolkit.legacyUserProfileCustomizations.stylesheets to True)

create or find userChrome.css - https://www.userchrome.org/how-create-userchrome-css.html or https://www.howtogeek.com/334716/how-to-customize-firefoxs-user-interface-with-userchrome.css/
1) Open "about:support" in Firefox
2) Click on "Profile Folder" button.
3) Steps inside folder
4) create "chrome" folder

put content of https://github.com/MrOtherGuy/firefox-csshacks/blob/master/chrome/multi-row_tabs.css to userChrome.css

In version FF 76.0.1, something was broken in again, download of latest multi-row_tabs.css helps to make work again.

in FF 81.0 something changed again and required to reload latest multi-row_tabs.css from github again

shell function to put changes in previous git commit

code for '~/.profile' file:

amendPrevCommit() {
  BRANCH=`git branch | grep \* | cut -d ' ' -f2`
  cd `git rev-parse --show-toplevel`
  git stash
  git branch -D $BRANCH-temp-for-stash
  git checkout -b $BRANCH-temp-for-stash
  git checkout -
  git reset HEAD~1 --hard
  git stash pop
  git add .
  git commit --amend --no-edit
  git cherry-pick $BRANCH-temp-for-stash
}

after update of ~/.profile
do not forget to do "source ~/.profile" in terminal window

Example of use:
$ amendPrevCommit

How to quickly checkout github pull request

Two ways:

1.
$ git fetch origin pull/117/head:local-branch-name
$ git checkout local-branch-name

Or you can put in  ~/.profile following function:

checkoutPull() {
  #Usage: checkoutPull pr-number pr-branch
  #   or  checkoutPull pr-number user:pr-branch
  BRACH=$(echo $2 | sed -e "s/^.*://")
  if git branch | grep $BRACH; then
    echo "Branch $BRACH already exists and should be removed"
    read -p "Are you sure (y/n)? " -n 1 -r
    echo    # (optional) move to a new line
    if [[ $REPLY =~ ^[Yy]$ ]]
    then
      git branch -D $BRACH
    fi
  fi
  echo "git fetch upstream pull/$1/head:$BRACH"
  git fetch upstream pull/$1/head:$BRACH
  echo "git checkout $BRACH"
  git checkout $BRACH
}

And use it as:
$ checkoutPull 3058 my-coworker-username:issue-51502

2.
One more approach is or create function that consume easy to copy value from Github page. All PRs pages show this value as text "my-coworker-fork:his-branch".
Add to ~/.profile
checkoutForked() {
  #usage: checkoutForked another-fork:branch-in-fork
  FORK=$(echo $1 | cut -d ':' -f 1)
  BRANCH=$(echo $1 | cut -d ':' -f 2)
  REPO=$(grep -A 1 "\"origin\"" .git/config | grep github | sed -E "s/.*\///");
  if git remote | grep $FORK; then
    echo "Fork already exists"
  else
    echo "git remote add $FORK git@github.com:$FORK/$REPO;"
    git remote add $FORK git@github.com:$FORK/$REPO;
  fi
  echo "git fetch $FORK"
  git fetch $FORK
  if git branch | grep $FORK/$BRANCH; then
    echo "Branch $FORK/$BRANCH already exists"
  else
    echo "git checkout $FORK/$BRANCH"
    git checkout $FORK/$BRANCH
    echo "git checkout -b $FORK/$BRANCH"
    git checkout -b $FORK/$BRANCH
  fi
}
execute:
$ checkoutForked my-coworker-fork:his-branch

NOTE:
to push to forked repo remote you will need bind your branch and his branch:
git push my-coworker-fork my-coworker-fork/his-branch:his-branch -f

How to find and install missed man page or section in linux

Two options:
1) web
2) in server repositories

1) In web - just google it
https://www.google.com/search?q=man+7+signal
Will result in smth like http://man7.org/linux/man-pages/man7/signal.7.html

2) In server
$ man kill
# no signals details , most likely in "SEE ALSO .... signals(7)"

$ man 7 signal
No manual entry for signal in section 7

$ yum provides */signal.7.gz
...
#man-pages-3.53-5.el7.noarch : Man (manual) pages from the Linux Documentation Project
#Repo : rhel-7-server-rpms-master
#Matched from:
#Filename : /usr/share/man/man7/signal.7.gz
..

$ sudo yum install man-pages

$ man 7 signal

How to get name of laptop from windows command line

In Windows CMD:

wmic csproduct get vendor,name,identifyingnumber

Result is smth like:

IdentifyingNumber  Name            Vendor

JG1Z111            Latitude E6420  Dell Inc.

Process maven's pom xml file with xmlstarlet

General command  to get version of certain plugin dependency from pom file:

xmlstarlet sel -N pom=http://maven.apache.org/POM/4.0.0 -t -m "/pom:project/pom:build/pom:pluginManagement/pom:plugins/pom:plugin[pom:artifactId='maven-checkstyle-plugin']/pom:dependencies/pom:dependency[pom:artifactId='checkstyle']/pom:version" -v . pom.xml

Examples for editing and selection are at:
https://github.com/sevntu-checkstyle/sevntu.checkstyle/blob/master/pom-version-bump.sh

https://github.com/checkstyle/checkstyle/wiki/How-to-generate-Checkstyle-report-for-Google-Guava-project

Few XPATH conditions for query:
http://stackoverflow.com/questions/28370054/find-a-specific-groupid-from-a-maven-pom-xml-using-xmstarlet


Useful command to print all tags from xml file to help construct XPATH:
xmlstarlet el -v pom.xml