Perl: slurp STDIN

Source: How can I slurp STDIN in Perl?

my $str = do { local $/;  };

macOS: get actual printer IP address

Source: How do I get the actual ip address of a printer in OSX Yosemite

http://localhost:631/printers/

git: rename a branch

Source: Rename a local and remote branch in git

Rename local branch.

git branch -m new-name

Delete the old-name remote branch and push the new-name local branch.

git push origin :old-name new-name

Reset the upstream branch for the new-name local branch.

git push origin -u new-name

macOS: checking for OpenSSL... configure: error: not found

Source: Problem with openssl on macOS
If your ./configure (e.g. for pgbouncer) terminates with the following error despite openssl being installed:

checking for OpenSSL... configure: error: not found

Then, restart it like follows:

./configure --with-openssl=/usr/local/opt/openssl

macOS: listening ports

Source: How can I list my open network ports with netstat?

[jerome@jeroboam] > sudo lsof -PiTCP -sTCP:LISTEN | grep 6432
pgbouncer 10533 jerome    9u  IPv6 0x8678a9be8d9262f5      0t0  TCP *:6432 (LISTEN)
pgbouncer 10533 jerome   10u  IPv4 0x8678a9be9e2f23dd      0t0  TCP *:6432 (LISTEN)

ssh: ssh a remote host via a bastion

Source: SSH ProxyCommand example: Going through one host to reach another server

In order to reach remote1 through a bastion host, add the following lines in your .ssh/config:

Host bastion
HostName bastion-01.golgoth.com
User jgallinari

Host remote1
HostName remote1.toto.swir
User jgallinari
ProxyCommand ssh jgallinari@bastion -W %h:%p

Then ssh remote1 should do it.

macOS: find your CPU

[jerome@jeroboam] > sysctl -n machdep.cpu.brand_string
Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz

AWS: Using environment variables in CodeBuild buildspec

Source: Using environment variables in AWS CodeBuild buildspec.yml
See S3_BUCKET below, which is first expanded from ImportValue, then used in BuildSpec.

  AvUsageQuarantineBuildProject:
    Type: AWS::CodeBuild::Project
    Condition: Preprod
    Properties:
      Name: av-usage-quarantine-build
      ServiceRole: !GetAtt AvUsageQuarantineBuildProjectRole.Arn
      Artifacts:
        Type: CODEPIPELINE
        Name: av-usage-quarantine
      Environment:
        Type: LINUX_CONTAINER
        ComputeType: BUILD_GENERAL1_SMALL
        Image: aws/codebuild/java:openjdk-8
        EnvironmentVariables:
          - Name: S3_BUCKET
            Value: !ImportValue delivery-AvDeliveryUtilsBucket
      Source:
        Type: CODEPIPELINE
        BuildSpec: !Sub |
          version: 0.2
          phases:
            install:
              commands:
                - cd ~; wget https://raw.github.com/technomancy/leiningen/stable/bin/lein; chmod +x lein; mv lein /bin
                - LEIN_ROOT=true lein
            build:
              commands:
                - cd $CODEBUILD_SRC_DIR
                - LEIN_ROOT=true lein uberjar
            post_build:
              commands:
                - aws cloudformation package --template template.yaml --s3-bucket $S3_BUCKET --s3-prefix lambda --output-template av-usage-quarantine-output-template.yaml

macOS: Terminal follow focus

Source: Set Terminal Focus to Follow the Mouse Cursor in Mac OS X
Follow focus ON

defaults write com.apple.Terminal FocusFollowsMouse -string YES

Follow focus OFF

defaults write com.apple.Terminal FocusFollowsMouse -string NO

Then, restart Terminal.

Working on High Sierra 10.13.6.

Clojure: transducers from the ground up

Clojure transducers from the ground up: the practice

AWS: !Sub |

• Understanding AWS CloudFormation !Sub Syntax
• What does “!Sub |” mean in AWS UserData field with YAML syntax?

Q: What does !Sub | mean ?
A: This means that you can enter normal looking text without having to use things like "\n" to mean end of line.

AWS: 7 Awesome CloudFormation Hacks

Source: 7 Awesome CloudFormation Hacks

Clojure: count truthy occurences

Count truthy occurences

(count (filter identity [nil 1 nil 4 nil]))
2

Count falsey occurences

(count (filter #(or (false? %) (nil? %)) [nil 1 false 4 nil]))
3

macOS: know the previous shutdowns cause

centurion:~ jerome$ log show --predicate 'eventMessage contains "Previous shutdown cause"' --last 24h

Filtering the log data using "eventMessage CONTAINS "Previous shutdown cause""
Skipping info and debug messages, pass --info and/or --debug to include.
Timestamp                       Thread     Type        Activity             PID    TTL  
2018-07-14 11:14:28.111106+0200 0xe5       Default     0x0                  0      0    kernel: (AppleSMC) Previous shutdown cause: 5
2018-07-14 11:32:41.196172+0200 0xe3       Default     0x0                  0      0    kernel: (AppleSMC) Previous shutdown cause: 5
 --------------------------------------------------------------------------------------------------------------------
Log      - Default:          2, Info:                0, Debug:             0, Error:          0, Fault:          0
Activity - Create:           0, Transition:          0, Actions:           0

macOS: release C-left, C-right, C-up, C-top for Emacs

On Emacs, I use key bindings for ^↑ (C-up), ^↓ (C-down), ^← (C-left) and ^→ (C-right), but macOS by default maps them to Mission Control. In order to replace ^ with ⌘ for Mission Control shortcuts, use System Preferences > Keyboard > Shortcuts like in

macOS: install Apache2::Request mod_perl module

Sources:

• Compile mod_perl for Apache 2.4 on Mac OS X 10.10 Yosemite 
• Installing RApache on Mac OS X Snow Leopard 
• Apache libapreq2

Trying to install Apache2::Request on macOS from CPAN will cause multiple errors.

cpan Apache2::Request

First, we will need apxs (Apache Extension tool).
For this, install httpd from homebrew.

brew install httpd

Then, we will need Xcode.
So, install it from the Apple Store.

Then, Apache2::Request install will try to have access to multiple Xcode directories that do not exist.
So, create symbolic links and missing directory.

sudo ln -s /Applications/Xcode.app/Contents/Developer/Toolchains/ /Applications/Xcode.app/Contents/Developer/Toolchains/OSX10.13.xctoolchain

sudo mkdir -p /Applications/Xcode.app/Contents/Developer/Toolchains/OSX10.13.xctoolchain/usr/local/bin/

sudo ln -s /usr/local/bin/apxs /Applications/Xcode.app/Contents/Developer/Toolchains/OSX10.13.xctoolchain/usr/local/bin/apsx

sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.Internal.sdk

Then install libapreq2 library.

1. Download libapreq2-2.13. 
2. Compile libapreq2 sources.

tar xvfz libapreq2-2.13.tar.gz
cd libapreq2-2.13
./configure
make
make install

Then install mod_perl 2.

svn checkout https://svn.apache.org/repos/asf/perl/modperl/trunk/ mod_perl-2.0
cd mod_perl-2.0
perl Makefile.PL MP_CCOPTS=-std=gnu89
make
make install

NB: mod_perl.so and mod_apreq2.so will be installed in /usr/local/lib/httpd/modules.

Then update Apache configuration.

vi /usr/local/etc/httpd/httpd.conf

LoadModule perl_module lib/httpd/modules/mod_perl.so
LoadModule apreq_module lib/httpd/modules/mod_apreq2.so
...
ServerName jeroboam:8080
...
PerlSwitches -I /Users/jerome/perl5/lib/perl5
PerlModule Apache::DBI
PerlModule ModPerl::Registry
PerlRequire /Users/jerome/src/connectmv/perl/lib/startup.pl
<Location /hlr_vas/>
    SetHandler perl-script
    PerlResponseHandler MBQT::mod_perl::HlrVas
</Location>

# PerlSetEnv DBG_FLG 1

Apache restart

/usr/local/bin/apachectl restart

macOS: iconify / deiconify shortcuts

• Iconify: ⌘+M
• Deiconify: ⌘+TAB, then select application, then press ⌥, then, release ⌘

macOS: paste without style

Instead of using ⌘+V , you can press ⌥+⇧+⌘+V to paste text without any formatting.

macOS: triple click to select path in Terminal

Source: Is there a UNIX-style triple click to select path in Terminal.app?
The shortcut for Terminal.app is ⌘+⇧+doubleclick.

macOS: install postgreSQL 9.4

brew install postgresql@9.4 --with-python
brew link postgresql@9.4 --force