Restructuring

Author: sudev

README.md

@@ -1,12 +1,11 @@
 Bash Workshop
 =============
-> Learn bash using examples 
 
-[Handout for participants](https://github.com/fosscell/bashworkshop/blob/master/Bashworkshop.md)
-
-[Finding five longest ping response time](https://github.com/fosscell/bashworkshop/blob/master/five-longest-ping-data.md)
+We are trying to make a proper document roadmap for bash scripting so expect for improvements 
+in the following document.
 
-[A simple Dictionary Script](https://github.com/fosscell/bashworkshop/blob/master/dictionary.sh)
+All the scripts in this repo will be discussed in coming session.
 
-[Implementaion of uniq using bash](https://github.com/fosscell/bashworkshop/blob/master/uniq/uniq.sh)
+ 
+[Handout for participants](https://github.com/fosscell/bashworkshop/blob/master/Bashworkshop.md)
 

Scripts/README.md

@@ -0,0 +1,10 @@
+Scripts
+=======
+
+Scripts which should have been discussed during SFD, we will be discussing the same scripts in 
+the coming session.
+
+You are free to try and understand these scripts.
+
+Documentation will be improved soon.
+

Scripts/array

@@ -0,0 +1,17 @@
+#!/bin/bash -xv
+array=(`ls`)
+len=${#array[*]}
+echo "The array has $len items and the sh files in this folder are:"
+k=1
+i=0
+while [ $i -lt $len ]; do
+            if [[ ${array[$i]} == *."$1" ]]
+            then 
+            echo "$k: ${array[$i]}"
+            let k++
+            fi
+            let i++
+            done
+echo -e "\nThere are $k files with the extension $1"
+
+array=(`ls`)

Scripts/debug/debug.md

@@ -0,0 +1,3 @@
+Resource 
+
+http://binfalse.de/2012/09/howto-debug-bash-scripts/

Scripts/dictionary.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+#A very simple dictionary inside terminal 
+
+#Creating a temp folder 
+dir=~/.dict
+
+#Check for the existence of directory, if not present create one
+[[ -d $dir ]] || mkdir $dir
+
+
+#download respective file from dictionary dot com 
+# -q => do it quietly ie nothing @ screen 
+# -O save it as mean
+wget -q -O $dir/mean http://dictionary.reference.com/browse/$1
+
+#Please DON'T hard code the value, give it to variable and then use it 
+file=$dir/mean
+
+#grepping out result
+m=$(cat $file | grep description | grep -Po 'content=.*.*See more' | grep -Po '\,.*.\.')
+
+#saving the error code 
+k=$(echo $?)
+
+#echoing
+echo "Meaning of the word "$1" is"$m
+
+#checks if the word was actually available else throws an error
+if [[ $k -gt 0 ]]; 
+then 
+    echo ".........oops, cant find word "$1;
+fi
+

Scripts/five-longest-ping-data.md

@@ -0,0 +1,80 @@
+## Find the five longest ping response time from google.com 
+
+Lets do it in some steps 
+
+Creating a new file
+	
+	touch tmp	
+		creates a file named tmp in your present working directory
+
+Using ping command 
+	
+	ping google.com
+		ping command is used to ping a server using ICMP ECHO_REQUESTS to network hosts
+
+Redirecting the ping data and running it in background
+	
+	ping google.com > tmp &
+		 >  is used to redirect the ping data into the text file tmp 
+		 &  makes the entire process to run in background 
+
+Extracting the required data
+
+
+	using awk and cut,
+	
+	awk '{print $8}' tmp
+        http://www.grymoire.com/Unix/Awk.html	
+		awk is rather a programing language specilized in manupilating text files
+		here awk is used to printout only the coloumn no 8 of the text file named 'tmp'
+		
+	awk '{print $8}' tmp | cut -d “=” -f2 
+		cut - remove sections from each line of files
+		here we trying to extarct only the numbers 
+		delimiter option -d
+		field option -f 
+
+	using grep and cut,
+		
+	cat tmp | grep -Po 'time.*.ms' 
+		grep is a command used to search for a given pattern inside a text file
+		text content of the temp file is piped to grep command 
+		-P enabling regex (perl regex)
+		-o print only matching 
+		
+	cat tmp | grep -Po 'time.*.ms' | cut -d "=" -f 2 
+		
+	
+	cat tmp | grep -Po 'time.*.ms' | cut -d "=" -f 2 | cut -d " " -f 1
+
+	
+Finding the longest
+	
+	awk '{print $8}' tmp | cut -d “=” -f2 | sort 
+		
+		sort - sort lines of text 
+	
+	awk '{print $8}' tmp | cut -d “=” -f2 | sort | uniq 
+	
+		uniq - removes adjacent duplictes after sort 
+	
+	awk '{print $8}' tmp | cut -d “=” -f2 | sort | uniq | tail -n 5 
+	
+		tail - used to output the last part of file 
+		last n lines using -n option 
+
+	Or using grep 
+	
+	cat tmp | grep -Po 'time.*.ms' | cut -d "=" -f 2 | cut -d " " -f 1 | sort | uniq | tail -n 5
+
+
+		
+		
+		
+		
+		
+
+	
+	
+ 
+

Scripts/licenser.sh

@@ -0,0 +1,13 @@
+#/bin/bash
+
+//A script to add license to top part of all the php files inside a folder  
+//This script is helpful to a add a part of to large no of files inside a folder 
+[ -f license ] || echo "can't find the license file required to append license "
+
+for a in *php
+do
+    echo "adding license to $a"
+    cat license $a > temp
+    mv temp $a
+done
+

Scripts/pron.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+#A very simple pronunciation tool l
+
+#Creating a temp folder 
+dir=~/.dict
+
+#Check for the existence if not create one
+[[ -d $dir ]] || mkdir $dir
+
+
+#download respective file from dictionary dot com 
+# -q => do it quietly ie nothing @ screen 
+# -O save it as mean
+wget -q -O $dir/pron http://en.wiktionary.org/wiki/$1
+
+#Please DON'T hard code the value, give it to variable and then use it 
+file=$dir/pron
+
+#grepping out result
+m=$(cat $file | grep -Po '//upload.*.ogg' | grep -v type)
+
+#saving the error code 
+k=$(echo $?)
+
+#checks if the word was actually available else throws an error
+if [[ $k -gt 0 ]];
+then 
+    echo ".........oops, cant find word "$1;
+    return
+fi
+
+#download the file 
+wget -q -O $dir/$1.ogg http:$m 
+
+ans="y"
+
+#while loop 
+#while [[ $ans =~ [yY].* ]]
+while [[ $ans == y ]]
+do
+    #mplayer is one of the default audio player in Linux
+    mplayer $dir/$1.ogg 2>/dev/null 1>/dev/null
+    
+    echo "do you want me to play it again [y] / [n] ? "
+    
+    #read user input
+    read ans
+done
+
+#remove the file from temp folder
+rm $dir/$1.ogg
+
+
+#Exit 
+echo -e "\n Exiting ...\n"

Scripts/timer.sh

@@ -0,0 +1,5 @@
+local N=$(($1*60)); shift
+(sleep $N && zenity --info --title="Time's Up" --text="${*:-        Times up boy :( $1 minute over}") &
+echo "timer set for $1 minutes"
+
+

Scripts/uniq/notes

@@ -0,0 +1,12 @@
+start
+        * test the uniq command
+        * redirect the test input to uniq
+        * analyze the output that only the adjacent repeating values are
+          processed
+
+
+next step
+        * show the source code ==> make them write it
+        * tell them about the basics of looping and conditional statements
+        * file redirection
+        * command line arguments ( $1 $@ $2 ...)

Scripts/uniq/test

@@ -0,0 +1,7 @@
+1
+2
+2
+3
+4
+1
+4

Scripts/uniq/uniq.sh

@@ -0,0 +1,21 @@
+## bash script to simulate uniq command also to introduce the concept of loops, conditional statements etc.
+
+#!/bin/bash
+
+## to keep track of the previous input line
+prev=""
+
+## while loop continues till the whole input is read line by line
+while read line         
+do
+        ## checks if the previous input is same as the current input
+        if [ "$prev" != "$line" ] && [ "$prev" != "" ]          
+        then
+                ## print the uniq input to standard output
+                echo $prev      
+        fi
+        prev=$ine
+        ## updates the prev variable
+done < $1       ## giving the file as input
+
+echo $prev      ## echo the last uniq line

Scripts/zipo.sh

@@ -0,0 +1,51 @@
+#!/bin/bash -xv
+
+#Checking if the user has passed any argument 
+# $# variable outputs the total no of arguments given by the user 
+(($#)) || { echo -e "Please check your argument \nUsage ./zipo [-x | -c ] <zip-file-name>" >&2; exit 1;}
+
+if [ -f $1 ]; then
+
+#case in bash 
+case $1 in 
+            *.tar.bz2)
+                tar xjf $1
+            ;;
+            *.tar.gz)
+                tar xzf $1
+            ;;
+            *.bz2)
+                bunzip2 $1
+            ;;
+            *.rar)
+                rar x $1
+            ;;
+            *.gz)
+                gunzip $1
+            ;;
+            *.tar)
+                tar xf $1
+            ;;
+            *.tbz2)
+                tar xjf $1
+            ;;
+            *.tgz)
+                tar xzf $1
+            ;;
+            *.zip)
+                unzip $1
+            ;;
+            *.Z)
+                uncompress $1
+            ;;
+            *.7z)
+                7z x $1
+            ;;
+            *)
+                echo "'$1' cannot be extracted via zipo()"
+            ;;
+            
+        esac;
+    else
+        echo "I can't help you with this format";
+    fi

masterDoc.md

@@ -4,8 +4,8 @@ PART I
 What is a Shell ?
 =================
 
-    - its an interpretter to pass commands given by user to the kernel
-    - commands can be excuted line by line
+    - its an interpreter to pass commands given by user to the kernel
+    - commands can be executed line by line
     - there are different types of shells
 
 Types of Shells
@@ -38,7 +38,7 @@ PART II
 where / when / what scripting ?
 ===============================
 
-    - many single line commands can be grouped togather and put into a single file called script
+    - many single line commands can be grouped together and put into a single file called script
     - when the script is an input to a shell its called shell script and here specifically its called bash scripting as the shell is bash
     -	mostly in interpreted language
     -	small scale programs/automation
@@ -57,14 +57,14 @@ Why to Write Shell Script ?
 Variables:
 ==========
      
-     System Variables and Enviornment 
+     System Variables and Environment 
         Very commonly used variables maintained by shell, represented with capital letters 
         env command to get a list of all system variables.
         Example:
                 $HOME
                 $RANDOM
 
-    Loosly typed
+    Loosely typed
         - need not specify data type during variable declaration
         Example :
             i=5         // i will hold an integer value now 
@@ -189,7 +189,7 @@ Shell Arithmetic
 	 			operations -gt -lt -eq -ne -ge -le 
 	 	
 
-Commandline Arguements
+Command line Arguments
 ======================
 																										
     input is given as <script name> arg1 arg2 arg3....