diff --git a/bash.md b/bash.md
index 8919528..720dcff 100644
--- a/bash.md
+++ b/bash.md
@@ -1,6 +1,17 @@
 # Bash
 
+https://www.shellcheck.net/
+
+## Learning
+- https://cmdchallenge.com/
+- https://explainshell.com/
+
 ### Bash Tips
+- http://www.kfirlavi.com/blog/2012/11/14/defensive-bash-programming/ <- **MUST READ**
+- https://google.github.io/styleguide/shell.xml
+- https://www.blockloop.io/mastering-bash-and-terminal
+- https://php-and-symfony.matthiasnoback.nl/2017/03/bash-practices-input-validation-and-local-variables/
+- http://tuxtweaks.com/2014/05/bash-getopts/
 - http://redsymbol.net/articles/unofficial-bash-strict-mode/
 - http://redsymbol.net/articles/bash-exit-traps/
 - http://unix.stackexchange.com/questions/97101/how-to-catch-an-error-in-a-linux-bash-script
@@ -9,3 +20,9 @@
 - http://www.linuxjournal.com/content/bash-sub-shells
 - https://stelfox.net/blog/2013/11/fail-fast-in-bash-scripts/
 - http://rockhopper.monmouth.edu/cs/jchung/cs370/cs_370_-_subshells_and_parallel_processing
+- https://jvns.ca/blog/2017/03/26/bash-quirks/
+
+## Windows
+**Windows cmd.exe access BASH WSL**  
+`cd %localappdata%\Lxss\ && dir`
+- https://remysharp.com/2017/06/26/windows-10-bashing
\ No newline at end of file
diff --git a/bin/list_modules.pl b/bin/list_modules.pl
new file mode 100644
index 0000000..2e3cf5c
--- /dev/null
+++ b/bin/list_modules.pl
@@ -0,0 +1,115 @@
+#!/usr/bin/perl
+
+# cpan modules were installed say a year ago. If you
+# cpan install that same module on another system it
+# will be a different version. With cpanm/cpanfile 
+# you can specify a version. This tool allows you
+# to dump a cpanfile compatible formatted output of 
+# the current environments module versions.
+# 
+# @example output
+# requires 'Proc::Daemon', '== 0.14';
+# 
+# @usage 
+# To see all modules with version
+# ./list_modules.pl
+#  
+# To see a filtered down list
+# ./list_modules.pl MongoDB,Beanstalkd,Dumper
+# 
+# @notes
+# - use cpanminus! 
+#   `curl -L https://cpanmin.us | perl - --sudo App::cpanminus`
+#   `cpanm --installdeps .`
+# - Another way to see installed modules perldoc perllocal
+
+use strict;
+use ExtUtils::Installed;
+
+my @filtered = map {split(/,/, $_)} @ARGV;
+my $filter_count = scalar @filtered;
+
+my $inst    = ExtUtils::Installed->new();
+my @modules = $inst->modules();
+my %modules_map = map { $_ => 1 } @modules;
+
+my $file = '';
+my $files;
+my $version;
+my @matched = ();
+
+sub add_module_info {
+  my $module_name = shift;
+  $version = $inst->version($module_name);
+  push @matched, "requires '$module_name', '== $version';";
+}
+
+sub print_list {
+  my $list_ref = shift;
+  my @list = sort @{$list_ref};
+
+  foreach my $match (@list) {
+    print "$match\n";
+  }
+}
+
+sub already_matched {
+  my $module_name = shift;
+  my @found = grep(/$module_name/, @matched);
+  my $matched_x = scalar @found;
+  return ($matched_x ne 0);
+}
+
+sub is_in_filter {
+  my $module_name = shift;
+  foreach my $filter (@filtered) {
+    if (index($module_name, $filter) != -1) {
+      return 1;
+    }
+  }
+
+  return 0;
+}
+
+foreach my $module (@modules) {
+  # Checking for filter matches
+  if ($filter_count gt 0) {
+    if (!is_in_filter($module)) {
+      next;
+    }
+  }
+
+  add_module_info($module);
+}
+
+# Checking for filter matches
+if ($filter_count eq 0) {
+  print_list(\@matched);
+  exit 0;
+}
+
+my @missing = ();
+
+# Post process and make sure to check each module 
+# name explicitly provided
+foreach my $filter (@filtered) {
+  if (already_matched($filter)) {
+    next;
+  }
+
+  my ($module_ns, $submodule) = split(/::/, $filter);
+
+  if (already_matched($module_ns)) {
+    next;
+  }
+
+  if(exists($modules_map{$module_ns})) {
+    add_module_info($module_ns);
+  } else {
+    push @missing, "# Missing: requires '$filter', '== x.y.z';";
+  }
+}
+
+print_list(\@matched);
+print_list(\@missing);
+exit 0;
\ No newline at end of file
diff --git a/git.md b/git.md
new file mode 100644
index 0000000..d0c4d47
--- /dev/null
+++ b/git.md
@@ -0,0 +1,17 @@
+# git
+
+- Files changes in a commit  
+  `git diff-tree --no-commit-id --name-only -r c06d5186ed7`
+- Last commit files changes  
+  `git rev-parse HEAD | xargs -I {} git diff-tree --no-commit-id --name-only -r {}`
+- Current files  
+  `git status -s | grep php | sed 's/^ *//' | cut -d' ' -f2`
+- Pipe to lint quickly  
+  `xargs -I {} php -l  {}`  
+  `git rev-parse HEAD | xargs -I {} git diff-tree --no-commit-id --name-only -r {} | xargs -I {} php -l  {}`
+- Php file changes in a merge  
+  `git log -1 --name-only | grep '.php' | xargs -I{} php -l  {}`
+- Show files changes between branches  
+  `git diff remotes/origin/master remotes/origin/security-tweak --name-only`
+- Git show pending merges  
+`git show-ref | grep merge | cut -d' ' -f1 | xargs -I{} git show {}`
\ No newline at end of file
diff --git a/mongodb.md b/mongodb.md
index c49b2f9..4bca273 100644
--- a/mongodb.md
+++ b/mongodb.md
@@ -10,6 +10,8 @@ query="{class: 0, ts: {\$gt: ${second_ago} }}"
 mongo Health --eval "db.Stats.findOne($query).ts" &>/dev/null
 ```
 
+
+
 ## Export
 **Snapshot**  
 `mongodump --quiet -d User -o /data/snapshot/user-$(date +%Y%m%d)`
@@ -31,4 +33,18 @@ restore_data()
   mongo User --eval "$reindex" &>/dev/null
   mongo Health --eval "$reindex" &>/dev/null  
 }
+```
+
+## Schema Inspection
+With `variety.js` you can inspect a collection's schema, to get an idea of the field names and data types!
+
+https://github.com/variety/variety
+
+
+```bash
+product_class=2
+hours_ago=$(date -d '8 hour ago' "+%s")
+query="{'class': ${product_class}, 'ts': {'\$gt': ${hours_ago} }}"
+
+mongo Health --quiet --eval "var collection='Stats', query=${query}, outputFormat='json', limit=3000, maxDepth=1" variety.js
 ```
\ No newline at end of file
diff --git a/mysql.md b/mysql.md
new file mode 100644
index 0000000..9c4e9ef
--- /dev/null
+++ b/mysql.md
@@ -0,0 +1,11 @@
+# MySql
+
+**Flags to provide password in file**  
+`--defaults-file=user_pass.cnf`  
+`--login-path`  
+
+## Links
+- https://speakerdeck.com/samlambert/the-mysql-ecosystem-at-github-2015
+- https://www.percona.com/blog/2017/03/06/mysql-i-am-a-dummy/
+- https://twindb.com/use-proxysql-tools/
+- http://code.openark.org/blog/mysql/whats-so-complicated-about-a-master-failover
\ No newline at end of file
diff --git a/php.md b/php.md
new file mode 100644
index 0000000..f10da99
--- /dev/null
+++ b/php.md
@@ -0,0 +1,19 @@
+# PHP
+
+
+## Code Standards
+```shell
+composer global require phpmd/phpmd
+composer global require "squizlabs/php_codesniffer=*"
+phpcs --config-set default_standard PSR
+
+filename=test.php
+
+# Use mess detector!
+phpmd ${filename} text codesize,unusedcode,naming,design
+
+# Use Code style checker
+phpcs ${filename}`
+# To fix fails phpcbf is your friend!
+phpcbf ${filename}
+```