From a3ffe1f49afde3355dc2540e852fab77934bfb6d Mon Sep 17 00:00:00 2001
From: Peter Tripp <petertripp@gmail.com>
Date: Mon, 10 Feb 2014 16:35:16 -0800
Subject: [PATCH] Added cksum, touch, uname, which and sw_vers.

---
 common/cksum.md |  8 ++++++++
 common/touch.md | 16 ++++++++++++++++
 common/uname.md | 15 +++++++++++++++
 common/which.md | 12 ++++++++++++
 osx/sw_vers.md  | 12 ++++++++++++
 5 files changed, 63 insertions(+)
 create mode 100644 common/cksum.md
 create mode 100644 common/touch.md
 create mode 100644 common/uname.md
 create mode 100644 common/which.md
 create mode 100644 osx/sw_vers.md

diff --git a/common/cksum.md b/common/cksum.md
new file mode 100644
index 0000000000..e3e3f81b8d
--- /dev/null
+++ b/common/cksum.md
@@ -0,0 +1,8 @@
+# cksum
+
+> Calculates CRC checksums and byte counts of a file
+> Note, on old UNIX systems the CRC implementation may differ. 
+
+- Display a 32 checksum, size in bytes and filename
+
+`chksum {{filename}}`
diff --git a/common/touch.md b/common/touch.md
new file mode 100644
index 0000000000..beda030219
--- /dev/null
+++ b/common/touch.md
@@ -0,0 +1,16 @@
+# touch
+
+> Change a file access and modification times (atime, mtime)
+
+- Create a new empty file(s) or change the times for existing file(s) to current time.`
+
+`touch {{filename}}`
+
+- Set the times on a file to those specified 
+
+`touch -t 201412250801.59 {{filename}}
+`touch -t {{YYYYMMDDHHMM.SS}} {{filename}}
+
+- Set the times on a file to match those on second file
+
+`touch -r {{filename2}} {{filename}}`
diff --git a/common/uname.md b/common/uname.md
new file mode 100644
index 0000000000..bf89716a1c
--- /dev/null
+++ b/common/uname.md
@@ -0,0 +1,15 @@
+# uname
+
+> Print operating system name
+
+- Print all available operating system and kernel information
+
+`uname -a`
+
+- Print the current operating system name (e.g. Linux, Darwin, SunOS, etc)
+
+`uname -s`
+
+- Print the nodename (hostname) of the system
+
+`uname -n`
diff --git a/common/which.md b/common/which.md
new file mode 100644
index 0000000000..6d5327d30b
--- /dev/null
+++ b/common/which.md
@@ -0,0 +1,12 @@
+# which
+
+> Locate the a program in the user's path
+
+- Display the path of an executable program
+
+`which {{ls}}`
+`which {{executable}}`
+
+- If there are multiple executables which match, display all 
+
+`which -a {{executable}}`
diff --git a/osx/sw_vers.md b/osx/sw_vers.md
new file mode 100644
index 0000000000..977636a856
--- /dev/null
+++ b/osx/sw_vers.md
@@ -0,0 +1,12 @@
+# sw_vers
+
+> Print Mac OSX Software versioning information
+
+- Print OSX Version
+
+`sw_vers -productVersion`
+
+- Print OSX Build
+
+`sw_vers -buildVersion`
+