Merge branch 'master' into MarkdownFRChanges

1 files changed, 7 insertions, 3 deletions

diff --git a/bash.html.markdown b/bash.html.markdown
index 3f3e49eb..cda877ad 100644
--- a/bash.html.markdown
+++ b/bash.html.markdown
@@ -25,7 +25,7 @@ Nearly all examples below can be a part of a shell script or executed directly i
 [Read more here.](http://www.gnu.org/software/bash/manual/bashref.html)
 
 ```bash
-#!/bin/bash
+#!/usr/bin/env bash
 # First line of the script is shebang which tells the system how to execute
 # the script: http://en.wikipedia.org/wiki/Shebang_(Unix)
 # As you already figured, comments start with #. Shebang is also a comment.
@@ -74,8 +74,8 @@ echo ${Variable/Some/A} # => A string
 
 # Substring from a variable
 Length=7
-echo ${Variable:0:Length} # => Some st
-# This will return only the first 7 characters of the value
+echo ${Variable:0:$Length} # => Some st
+# This will return 7 characters of the string, starting from the first char
 
 # Default value for variable
 echo ${Foo:-"DefaultValueIfFooIsMissingOrEmpty"} 
@@ -228,10 +228,13 @@ mv s0urc3.txt dst.txt # sorry, l33t hackers...
 # Since bash works in the context of a current directory, you might want to 
 # run your command in some other directory. We have cd for changing location:
 cd ~    # change to home directory
+cd      # also goes to home directory
 cd ..   # go up one directory
         # (^^say, from /home/username/Downloads to /home/username)
 cd /home/username/Documents   # change to specified directory
 cd ~/Documents/..    # still in home directory..isn't it??
+cd -    # change to last directory
+# => /home/username/Documents
 
 # Use subshells to work across directories
 (echo "First, I'm here: $PWD") && (cd someDir; echo "Then, I'm here: $PWD")
@@ -256,6 +259,7 @@ print("#stderr", file=sys.stderr)
 for line in sys.stdin:
     print(line, file=sys.stdout)
 EOF
+# Variables will be expanded if the first "EOF" is not quoted
 
 # Run the hello.py Python script with various stdin, stdout, and 
 # stderr redirections: