diff --git a/common/cal.md b/common/cal.md
new file mode 100644
index 0000000000..1733818a49
--- /dev/null
+++ b/common/cal.md
@@ -0,0 +1,19 @@
+# cal
+
+> Prints calendar information
+
+- Display a calendar for the current month or specified month
+
+`cal`
+`cal -m {{12}}`
+`cal -m {{Dec}}`
+
+- Display a calendar for the current year or a specified year
+
+`cal -y`
+`cal 2013`
+
+- Display date of Easter (western churches)
+
+`ncal -e`
+`ncal -e 2013`
\ No newline at end of file
diff --git a/common/cp.md b/common/cp.md
index fe035a5776..d99ba9ee98 100644
--- a/common/cp.md
+++ b/common/cp.md
@@ -10,10 +10,12 @@
 
 `cp {{/path/to/original}} ../{{/path/to/copy}}`
 
-- Copy directories recursive using the option -r.
+- Copy directories recursive using the option -r. Optionally showing files as they are copied.
 
 `cp -r {{/path/to/original}} {{/path/to/copy}}`
-
-- Copy files in verbose mode, showing files as they are copied. (Mostly interesting with -r option).
-
 `cp -vr {{/path/to/original}} {{/path/to/copy}}`
+
+- Make a copy of a file adding and extension or changing an extension  
+
+`cp {{file.html}}\{,.backup\}`
+`cp file.\{html,backup\}`
diff --git a/common/rm.md b/common/rm.md
index d3bf1745e7..1d911e3153 100644
--- a/common/rm.md
+++ b/common/rm.md
@@ -2,7 +2,7 @@
 
 > Remove files or directories
 
-- Remove files from arbitrary 
+- Remove files from arbitrary locations
 
 `rm {{/path/to/file}} {{/otherpath/to/file2}}`
 
@@ -12,4 +12,4 @@
 
 - Prompt before every removal
 
-`rm -i *`
\ No newline at end of file
+`rm -i {{\*}}`
\ No newline at end of file
diff --git a/common/srm.md b/common/srm.md
new file mode 100644
index 0000000000..e589ffbe10
--- /dev/null
+++ b/common/srm.md
@@ -0,0 +1,18 @@
+# srm
+
+> Securely remove files or directories
+> Overwrites the existing data one or multiple. Drop in replacement for rm.
+
+- Removes a file after overwriting (single pass, 7 pass, 35 pass)
+
+`srm -s {{/path/to/file}}`
+`srm -m {{/path/to/file}}`
+`srm {{/path/to/file}}`
+
+- Scurely remove recursively a directory and all it's subdirectories
+
+`srm -r {{/path/to/folder}}`
+
+- Prompt before every removal
+
+`srm -i {{\*}}`
\ No newline at end of file
diff --git a/linux/md5sum.md b/linux/md5sum.md
new file mode 100644
index 0000000000..cda2fb8775
--- /dev/null
+++ b/linux/md5sum.md
@@ -0,0 +1,13 @@
+# md5sum
+
+> Calculate MD5 cryptographic checksums
+
+- Calculate the MD5 checksum for file(s) or files in a directory, one checksum per file
+
+`md5sum {{filename1}}`
+`md5sum {{filename1}} {{filename2}}`
+`md5sum {{directory/\*}}`
+
+- Read a file of MD5SUMs and verify all files have matching checksums
+
+`md5sum -c {{filename.md5}}`
diff --git a/osx/md5.md b/osx/md5.md
new file mode 100644
index 0000000000..1b50f1c0a0
--- /dev/null
+++ b/osx/md5.md
@@ -0,0 +1,13 @@
+# md5
+
+> Calculate MD5 cryptographic checksums
+
+- Calculate the MD5 checksum for file(s) or files in a directory, one checksum per file
+
+`md5 {{filename1}}`
+`md5 {{filename1}} {{filename2}}`
+`md5 {{directory/\*}}`
+
+- Output only the md5 checksum (no filename)
+
+`md5 -q {{filename}}`
diff --git a/osx/xed.md b/osx/xed.md
new file mode 100644
index 0000000000..67431f407c
--- /dev/null
+++ b/osx/xed.md
@@ -0,0 +1,16 @@
+# xed
+
+> Opens files for editing in XCode
+
+- Open file(s) in XCode
+
+`xed {{file1}}`
+`xed {{/path/to/file1}} {{/path/to/file2}}`
+
+- Open file(s) in XCode, create if it doesn't exist
+
+`xed -c {{filename1}}`
+
+- Open a file in XCode and jump to line number 75
+
+`xed -l 75 {{filename}}`