3 files changed, 58 insertions, 0 deletions
diff --git a/date.md b/date.md
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--- /dev/null
+++ b/date.md
@@ -0,0 +1,7 @@
+# The date utility
+
+    date +FORMAT
+
+## UNIX timestamp
+
+    date +%s
diff --git a/ruby.md b/ruby.md
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index 0000000..2b205ce
--- /dev/null
+++ b/ruby.md
@@ -0,0 +1,15 @@
+# Ruby stuff
+
+## Bundler
+
+### Install packages locally
+
+    bundle install --path vendor/bundle
+
+## Gemfile
+
+### Basic
+
+    source 'https://rubygems.org'
+
+    gem 'gemname'
diff --git a/vim.md b/vim.md
index c69b9c4..f652188 100644
--- a/vim.md
+++ b/vim.md
@@ -13,6 +13,42 @@
 | `'`    | `:h 'ro'`     | option                                           |
 | `-`    | `:h -r`       | Vim argument (starting Vim)                      |
 
+## Registers
+
+: is the "last command" register. @: reruns the last command.
+
+## Marks
+
+mA - capital letters are global, will jump to file
+`a - jumps to line and column of mark, not just line
+
+## v/V/<c-v> as operators
+
+Most commands act line-wise (d2j deletes two lines). v makes things
+character-wise, <c-v> makes them block-wise.
+
+## Ranges
+
+    g/regex/command # executes command on each line matching regex
+    v/regex/command # executes command on each line not matching regex
+
+## Ex commands
+
+    :norm abc # runs the keys abc on each line in range
+    :g/abc/norm dt; # deletes until semicolon on each line with "abc"
+
+    :co <location> # copies range to location (can be ., +n, 'a)
+    :mv <location> # same but moves
+
+## Visual mode
+
+gv - selects the previous visual
+g<c-a/x> - increment/decrement by 1 more on each selected line
+
+    0          1            1
+    0 <c-a> -> 1  g<c-a> -> 2
+    0          1            3
+
 ## Using vim as a hex editor?
 
     :%!xxd