fix typos.

Author: Jonas Ohlsson

unix/fully_walking.md

@@ -1,14 +1,14 @@
 # Introduction to Unix (continued)
 
-In this part of the Unix tutorial, you will learn to download files, compress and decompress them, and combining commands
+In this part of the Unix tutorial, you will learn to download files, compress and decompress them, and combine commands. 
 
 ## Download files
 
-`wget` can be used to download files from internet and store them. The following downloads and stores a file called to the current directory.
+`wget` can be used to download files from the internet and store them. 
 
 `wget https://raw.githubusercontent.com/HadrienG/tutorials/master/LICENSE`
 
-will download the file that is located at the above URL on the internet, and put it **in the current directory**. This is the license under which this course is released. Open in and read it if you like!
+will download the file that is located at the above URL on the internet, and put it **in the current directory**. This is the license under which this course is released. Open it and read it if you like!
 
 The `-O` option can be used to change the output file name.
 
@@ -35,7 +35,7 @@ gzip is a utility for compressing and decompressing individual files. To compres
 
 `gzip filename`
 
-The filename will be deleted and replaced by a compressed file called filename.gz To reverse the compression process, use:
+The filename will be deleted and replaced by a compressed file called filename.gz. To reverse the compression process, use:
 
 `gzip -d filename.gz`
 
@@ -51,9 +51,9 @@ To create a gzipped disk file tar archive, use
 
 `tar -czvf archivename filenames`
 
-where archivename will usually have a .tar .gz extension
+where archivename will usually have a .tar.gz extension
 
-The c option means create, the v option means verbose (output filenames as they are archived), and option f means file.
+The c option means create, the v option means verbose (output filenames as they are archived), option f means file, and z means that the tar archive should be gzip compressed.
 
 To list the contents of a gzipped tar archive, use
 
@@ -65,7 +65,7 @@ To unpack files from a tar archive, use
 
 Try to archive the folder `Module_Unix` from the previous exercise!
 
-You will notice a file called tutorials.tar.bz2 in your home directory. This is also a compressed archive, but compressed in the bzip format. Read the tar manual and find a way to decompress it
+You will notice a file called tutorials.tar.bz2 in your home directory. This is also a compressed archive, but compressed in the bzip format. Read the tar manual and find a way to decompress it.
 
 Hint: you can read the manual for any command using `man`
 
@@ -79,13 +79,13 @@ Some commands give you an output to your screen, but you would have preferred it
 
 The output from a command normally intended for standard output (that is, your screen) can be easily diverted to a file instead. This capability is known as output redirection:
 
-If the notation `> file` is appended to any command that normally writes its output to standard output, the output of that command will be written to file instead of your terminal
+If the notation `> file` is appended to any command that normally writes its output to standard output, the output of that command will be written to file instead of your terminal.
 
 I.e, the following who command:
 
 `who > users.txt`
 
-No output appears at the terminal. This is because the output has been redirected  into the specified file.
+No output appears at the terminal. This is because the output has been redirected into the specified file.
 
 `less users.txt`
 
@@ -114,8 +114,8 @@ Remember the command `grep`? We can pipe other commands to it, to refine searche
 
 `ls -l ngs_course_data | grep "Jan"`
 
-will only give you the files and directories created in January
+will only give you the files and directories created in January.
 
 Tip: There are various options you can use with the grep command, look at the manual!
 
-Pipes are extremely useful to connect various bioinformatics softwares together. We'll use them extensively later.
+Pipes are extremely useful to connect various bioinformatics software together. We'll use them extensively later.