diff --git a/Sem 4/COA/img/readme.md b/Sem 4/COA/img/readme.md
new file mode 100644
index 0000000..5061edf
--- /dev/null
+++ b/Sem 4/COA/img/readme.md	
@@ -0,0 +1,39 @@
+
+[## Assignment](./## Assignment)
+
+[](./)
+
+[Diff b/w UNIX and LINUX](./Diff b/w UNIX and LINUX)
+
+[](./)
+
+[Assignment](./Assignment)
+
+[img](./img)
+
+[day10-21_05_2021.md](./day10-21_05_2021.md)
+
+[day11-24_05_2021.md](./day11-24_05_2021.md)
+
+[day12-26_05_2021.md](./day12-26_05_2021.md)
+
+[day13-27_05_2021.md](./day13-27_05_2021.md)
+
+[day2.md](./day2.md)
+
+[day3-2021_05_03.md](./day3-2021_05_03.md)
+
+[day4-2021_05_04.md](./day4-2021_05_04.md)
+
+[day5-05_05_2021.md](./day5-05_05_2021.md)
+
+[day6-06_05_2021.md](./day6-06_05_2021.md)
+
+[day7-10_05_2021.md](./day7-10_05_2021.md)
+
+[day8-11_05_2021.md](./day8-11_05_2021.md)
+
+[day9-12_05_2021.md](./day9-12_05_2021.md)
+
+[README.md](./README.md)
+
diff --git a/Sem 4/COA/readme.md b/Sem 4/COA/readme.md
new file mode 100644
index 0000000..4a75fcc
--- /dev/null
+++ b/Sem 4/COA/readme.md	
@@ -0,0 +1,17 @@
+
+[img](./img)
+
+[COA class3.pptx](./COA class3.pptx)
+
+[day3.md](./day3.md)
+
+[day4.md](./day4.md)
+
+[day5.md](./day5.md)
+
+[day6-2021_05_03.md](./day6-2021_05_03.md)
+
+[day7-06_05_2021.md](./day7-06_05_2021.md)
+
+[day8-07_05_2021.md](./day8-07_05_2021.md)
+
diff --git a/Sem 4/DBMS/assignment/quest/readme.md b/Sem 4/DBMS/assignment/quest/readme.md
new file mode 100644
index 0000000..43b5338
--- /dev/null
+++ b/Sem 4/DBMS/assignment/quest/readme.md	
@@ -0,0 +1,5 @@
+
+[a1.png](./a1.png)
+
+[q1.png](./q1.png)
+
diff --git a/Sem 4/DBMS/assignment/readme.md b/Sem 4/DBMS/assignment/readme.md
new file mode 100644
index 0000000..171447b
--- /dev/null
+++ b/Sem 4/DBMS/assignment/readme.md	
@@ -0,0 +1,3 @@
+
+[quest](./quest)
+
diff --git a/Sem 4/DBMS/img/readme.md b/Sem 4/DBMS/img/readme.md
new file mode 100644
index 0000000..171447b
--- /dev/null
+++ b/Sem 4/DBMS/img/readme.md	
@@ -0,0 +1,3 @@
+
+[quest](./quest)
+
diff --git a/Sem 4/DBMS/readme.md b/Sem 4/DBMS/readme.md
new file mode 100644
index 0000000..78f2d58
--- /dev/null
+++ b/Sem 4/DBMS/readme.md	
@@ -0,0 +1,27 @@
+
+[assignment](./assignment)
+
+[img](./img)
+
+[2021_04_29- three schema arch,data independence,dbms lang.md](./2021_04_29- three schema arch,data independence,dbms lang.md)
+
+[2021_04_30 - .md](./2021_04_30 - .md)
+
+[2021_05_03.md](./2021_05_03.md)
+
+[2021_05_04.md](./2021_05_04.md)
+
+[day14-31_05_2021.md](./day14-31_05_2021.md)
+
+[day15-01_06_2021.md](./day15-01_06_2021.md)
+
+[day5-07_05_2021.md](./day5-07_05_2021.md)
+
+[day6-10_05_2021.md](./day6-10_05_2021.md)
+
+[day7-11_05_2021.md](./day7-11_05_2021.md)
+
+[day8-24_05_2021.md](./day8-24_05_2021.md)
+
+[day9-25_05_2021.md](./day9-25_05_2021.md)
+
diff --git a/Sem 4/DE/README.md b/Sem 4/DE/README.md
index a6f26da..64bfd06 100644
--- a/Sem 4/DE/README.md	
+++ b/Sem 4/DE/README.md	
@@ -1,2 +1,19 @@
-## Design Process
-day2,3,4, in the same file [day2]
+
+[## Design Process](./## Design Process)
+
+[day2,3,4, in the same file [day2]](./day2,3,4, in the same file [day2])
+
+[img](./img)
+
+[day09-08_06_2021.md](./day09-08_06_2021.md)
+
+[day2to4-2021_05_04.md](./day2to4-2021_05_04.md)
+
+[day5-12_05_2021.md](./day5-12_05_2021.md)
+
+[day6-25_05_2021.md](./day6-25_05_2021.md)
+
+[README.md](./README.md)
+
+[removeAllTempFiles.bat](./removeAllTempFiles.bat)
+
diff --git a/Sem 4/DE/img/readme.md b/Sem 4/DE/img/readme.md
new file mode 100644
index 0000000..43b5338
--- /dev/null
+++ b/Sem 4/DE/img/readme.md	
@@ -0,0 +1,5 @@
+
+[a1.png](./a1.png)
+
+[q1.png](./q1.png)
+
diff --git a/Sem 4/DE/removeAllTempFiles.bat b/Sem 4/DE/removeAllTempFiles.bat
new file mode 100644
index 0000000..b0256b2
--- /dev/null
+++ b/Sem 4/DE/removeAllTempFiles.bat	
@@ -0,0 +1,3 @@
+@Echo OFF
+
+rm ./*~
diff --git a/Sem 4/MATH/img/readme.md b/Sem 4/MATH/img/readme.md
new file mode 100644
index 0000000..f7dc411
--- /dev/null
+++ b/Sem 4/MATH/img/readme.md	
@@ -0,0 +1,141 @@
+
+[# this file contains the ans for the [pdf](./basic_commands_practise_all.pdf) above](./# this file contains the ans for the [pdf](./basic_commands_practise_all.pdf) above)
+
+[](./)
+
+[## Answers](./## Answers)
+
+[](./)
+
+[1. `touch quest1.txt`](./1. `touch quest1.txt`)
+
+[](./)
+
+[2. `touch {one,two.three}.txt`](./2. `touch {one,two.three}.txt`)
+
+[](./)
+
+[3. `echo "Hello World!" > quest3.txt`](./3. `echo "Hello World!" > quest3.txt`)
+
+[> `cat quest3.txt`](./> `cat quest3.txt`)
+
+[](./)
+
+[4. `tr aeiou AEIOU`](./4. `tr aeiou AEIOU`)
+
+[> write anything here](./> write anything here)
+
+[](./)
+
+[5. `tee quest5.txt`](./5. `tee quest5.txt`)
+
+[> type anything here](./> type anything here)
+
+[](./)
+
+[> and it goes to file as well](./> and it goes to file as well)
+
+[](./)
+
+[6. `mkdir -p "ktu/fisat/csea/student"`](./6. `mkdir -p "ktu/fisat/csea/student"`)
+
+[](./)
+
+[7. `pwd`](./7. `pwd`)
+
+[](./)
+
+[8. `whereis bash`](./8. `whereis bash`)
+
+[](./)
+
+[9. `file <loction/u/got/above/for/bash>`](./9. `file <loction/u/got/above/for/bash>`)
+
+[](./)
+
+[10. `nano quest10.c`](./10. `nano quest10.c`)
+
+[](./)
+
+[> paste the code](./> paste the code)
+
+[```](./```)
+
+[#include<stdio.h>](./#include<stdio.h>)
+
+[void main(){](./void main(){)
+
+[	printf("hello");](./	printf("hello");)
+
+[}](./})
+
+[```](./```)
+
+[> `gcc quest10.c`](./> `gcc quest10.c`)
+
+[](./)
+
+[> `ls -l ./a.out`](./> `ls -l ./a.out`)
+
+[](./)
+
+[> `chmod +x ./a.out`](./> `chmod +x ./a.out`)
+
+[](./)
+
+[> `ls -l ./a.out`](./> `ls -l ./a.out`)
+
+[](./)
+
+[> `./a.out`](./> `./a.out`)
+
+[](./)
+
+[](./)
+
+[11. `file ./a.out`](./11. `file ./a.out`)
+
+[](./)
+
+[12. `echo "Hello World!"`](./12. `echo "Hello World!"`)
+
+[](./)
+
+[13. `history`](./13. `history`)
+
+[](./)
+
+[14. `cd ../..`](./14. `cd ../..`)
+
+[](./)
+
+[15. `ls | wc -l`](./15. `ls | wc -l`)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[basic_commands_practise_all.pdf](./basic_commands_practise_all.pdf)
+
+[README.md](./README.md)
+
diff --git a/Sem 4/MATH/readme.md b/Sem 4/MATH/readme.md
new file mode 100644
index 0000000..72d98ca
--- /dev/null
+++ b/Sem 4/MATH/readme.md	
@@ -0,0 +1,27 @@
+
+[img](./img)
+
+[.day5-20_05_2021.md](./.day5-20_05_2021.md)
+
+[day1-06_05_2021.md](./day1-06_05_2021.md)
+
+[day10-MOD2-28_05_2021.md](./day10-MOD2-28_05_2021.md)
+
+[day11-31_05_2021.md](./day11-31_05_2021.md)
+
+[day12-02_06_2021.md](./day12-02_06_2021.md)
+
+[day2-10_05_2021.md](./day2-10_05_2021.md)
+
+[day4-12_05_2021.md](./day4-12_05_2021.md)
+
+[day5-20_05_2021.md](./day5-20_05_2021.md)
+
+[day6-21_05_2021.md](./day6-21_05_2021.md)
+
+[day7-24_05_2021.md](./day7-24_05_2021.md)
+
+[day8-26_05_2021.md](./day8-26_05_2021.md)
+
+[day9-27_05_2021.md](./day9-27_05_2021.md)
+
diff --git a/Sem 4/MNC/readme.md b/Sem 4/MNC/readme.md
new file mode 100644
index 0000000..968fbed
--- /dev/null
+++ b/Sem 4/MNC/readme.md	
@@ -0,0 +1,9 @@
+
+[day07-04_06_2021.md](./day07-04_06_2021.md)
+
+[day08-08_06_2021.md](./day08-08_06_2021.md)
+
+[day4-25_05_2021.md](./day4-25_05_2021.md)
+
+[day6-01_06_2021.md](./day6-01_06_2021.md)
+
diff --git a/Sem 4/OS/Assignment/readme.md b/Sem 4/OS/Assignment/readme.md
new file mode 100644
index 0000000..c6a833f
--- /dev/null
+++ b/Sem 4/OS/Assignment/readme.md	
@@ -0,0 +1,3 @@
+
+[assignmentQuest1_atleast4pages.png](./assignmentQuest1_atleast4pages.png)
+
diff --git a/Sem 4/OS/README.md b/Sem 4/OS/README.md
index 6cdc02b..5061edf 100644
--- a/Sem 4/OS/README.md	
+++ b/Sem 4/OS/README.md	
@@ -1,4 +1,39 @@
-## Assignment
 
-Diff b/w UNIX and LINUX
+[## Assignment](./## Assignment)
+
+[](./)
+
+[Diff b/w UNIX and LINUX](./Diff b/w UNIX and LINUX)
+
+[](./)
+
+[Assignment](./Assignment)
+
+[img](./img)
+
+[day10-21_05_2021.md](./day10-21_05_2021.md)
+
+[day11-24_05_2021.md](./day11-24_05_2021.md)
+
+[day12-26_05_2021.md](./day12-26_05_2021.md)
+
+[day13-27_05_2021.md](./day13-27_05_2021.md)
+
+[day2.md](./day2.md)
+
+[day3-2021_05_03.md](./day3-2021_05_03.md)
+
+[day4-2021_05_04.md](./day4-2021_05_04.md)
+
+[day5-05_05_2021.md](./day5-05_05_2021.md)
+
+[day6-06_05_2021.md](./day6-06_05_2021.md)
+
+[day7-10_05_2021.md](./day7-10_05_2021.md)
+
+[day8-11_05_2021.md](./day8-11_05_2021.md)
+
+[day9-12_05_2021.md](./day9-12_05_2021.md)
+
+[README.md](./README.md)
 
diff --git a/Sem 4/OS/img/readme.md b/Sem 4/OS/img/readme.md
new file mode 100644
index 0000000..c6a833f
--- /dev/null
+++ b/Sem 4/OS/img/readme.md	
@@ -0,0 +1,3 @@
+
+[assignmentQuest1_atleast4pages.png](./assignmentQuest1_atleast4pages.png)
+
diff --git a/Sem 4/README.md b/Sem 4/README.md
new file mode 100644
index 0000000..4d113fe
--- /dev/null
+++ b/Sem 4/README.md	
@@ -0,0 +1,23 @@
+
+## Hello
+
+[COA](./COA)
+
+[DBMS](./DBMS)
+
+[DE](./DE)
+
+[labs](./labs)
+
+[MATH](./MATH)
+
+[MNC](./MNC)
+
+[OS](./OS)
+
+[index.ps1](./index.ps1)
+
+[README.md](./README.md)
+
+[removeAllTempFiles.bat](./removeAllTempFiles.bat)
+
diff --git a/Sem 4/index.ps1 b/Sem 4/index.ps1
new file mode 100644
index 0000000..633be06
--- /dev/null
+++ b/Sem 4/index.ps1	
@@ -0,0 +1,40 @@
+
+function createMd($a){
+  foreach ($i in ls -Directory -Name -Recurse)                                                                    
+  {
+    if($i -match "img" -match "False"){
+     ni index.md
+    }
+  }
+}
+
+
+function eachDir(){
+  foreach ($i in ls -Directory -Name -Recurse)                                                                    
+  {
+    if($i -match "img" -match "False"){
+     ac -Path ("C:\Users\Lijin\Desktop\Co-Science\Cs-Web\Cs-web-prod\Sem 4\"+ $i +"\index.md") -Value (ls $i)
+     $data=gc ("C:\Users\Lijin\Desktop\Co-Science\Cs-Web\Cs-web-prod\Sem 4\"+ $i +"\index.md")
+    }
+    $a=""
+    $data | foreach {
+      $a += "`n[$_]($_)`n"
+    }
+    clc ("C:\Users\Lijin\Desktop\Co-Science\Cs-Web\Cs-web-prod\Sem 4\"+ $i +"\index.md")
+    ac ("C:\Users\Lijin\Desktop\Co-Science\Cs-Web\Cs-web-prod\Sem 4\"+ $i +"\index.md") -Value $a
+  }
+}
+
+function notImp(){
+  $a=""
+  $data=gc .\index.md
+
+  $data | foreach {                                                                                               
+     $a += "`n[$_]($_)`n"
+  }
+
+  clc .\index.md
+  ac index.in -Value "$a"
+}
+
+eachDir
diff --git a/Sem 4/labs/Digi lab/img/readme.md b/Sem 4/labs/Digi lab/img/readme.md
new file mode 100644
index 0000000..8515340
--- /dev/null
+++ b/Sem 4/labs/Digi lab/img/readme.md	
@@ -0,0 +1,37 @@
+
+[Os lab meet link: https://meet.google.com/axn-hkft-xkv](./Os lab meet link: https://meet.google.com/axn-hkft-xkv)
+
+[](./)
+
+[Commands used in lab are in [commands](./commands.md)](./Commands used in lab are in [commands](./commands.md))
+
+[](./)
+
+[lab problems @ [lab questions](./lab%20questions/ )](./lab problems @ [lab questions](./lab%20questions/ ))
+
+[exp2](./exp2)
+
+[exp3](./exp3)
+
+[exp4](./exp4)
+
+[exp5](./exp5)
+
+[img](./img)
+
+[lab questions](./lab questions)
+
+[commands.md](./commands.md)
+
+[exp2.md](./exp2.md)
+
+[lab1.md](./lab1.md)
+
+[linux commands.md](./linux commands.md)
+
+[README.md](./README.md)
+
+[test.sh](./test.sh)
+
+[testtwo.sh](./testtwo.sh)
+
diff --git a/Sem 4/labs/Digi lab/readme.md b/Sem 4/labs/Digi lab/readme.md
new file mode 100644
index 0000000..94e5b3a
--- /dev/null
+++ b/Sem 4/labs/Digi lab/readme.md	
@@ -0,0 +1,3 @@
+
+[img](./img)
+
diff --git a/Sem 4/labs/OS lab/README.md b/Sem 4/labs/OS lab/README.md
index 2ade538..8515340 100644
--- a/Sem 4/labs/OS lab/README.md	
+++ b/Sem 4/labs/OS lab/README.md	
@@ -1,5 +1,37 @@
-Os lab meet link: https://meet.google.com/axn-hkft-xkv
 
-Commands used in lab are in [commands](./commands.md)
+[Os lab meet link: https://meet.google.com/axn-hkft-xkv](./Os lab meet link: https://meet.google.com/axn-hkft-xkv)
+
+[](./)
+
+[Commands used in lab are in [commands](./commands.md)](./Commands used in lab are in [commands](./commands.md))
+
+[](./)
+
+[lab problems @ [lab questions](./lab%20questions/ )](./lab problems @ [lab questions](./lab%20questions/ ))
+
+[exp2](./exp2)
+
+[exp3](./exp3)
+
+[exp4](./exp4)
+
+[exp5](./exp5)
+
+[img](./img)
+
+[lab questions](./lab questions)
+
+[commands.md](./commands.md)
+
+[exp2.md](./exp2.md)
+
+[lab1.md](./lab1.md)
+
+[linux commands.md](./linux commands.md)
+
+[README.md](./README.md)
+
+[test.sh](./test.sh)
+
+[testtwo.sh](./testtwo.sh)
 
-lab problems @ [lab questions](./lab%20questions/ )
diff --git a/Sem 4/labs/OS lab/exp2/README.md b/Sem 4/labs/OS lab/exp2/README.md
index de4e97e..bc784a6 100644
--- a/Sem 4/labs/OS lab/exp2/README.md	
+++ b/Sem 4/labs/OS lab/exp2/README.md	
@@ -1,44 +1,91 @@
-one.sh
-
-```
-a=$1
-b=$2
-
-while ((a!=b))
-do
-        if ((a>b))
-	then
-                ((a=a-b))
-        else
-                ((b=b-a))
-        fi
-done
-echo $a
-```
-
-two.sh
-```
-a=$1
-b=$2
-
-while ((b!=0))
-do
-        ((t=b))
-	((b=a%b))
-	((a=t))
-done
-echo $a
-```
-
-three.sh
-```
-read number
-fact=1
-i=1
-while ((i<=number))
-do
-	((fact=fact*i))
-	((i=i+1))
-done
-echo $fact
-```
+
+[one.sh](./one.sh)
+
+[](./)
+
+[```](./```)
+
+[a=$1](./a=$1)
+
+[b=$2](./b=$2)
+
+[](./)
+
+[while ((a!=b))](./while ((a!=b)))
+
+[do](./do)
+
+[        if ((a>b))](./        if ((a>b)))
+
+[	then](./	then)
+
+[                ((a=a-b))](./                ((a=a-b)))
+
+[        else](./        else)
+
+[                ((b=b-a))](./                ((b=b-a)))
+
+[        fi](./        fi)
+
+[done](./done)
+
+[echo $a](./echo $a)
+
+[```](./```)
+
+[](./)
+
+[two.sh](./two.sh)
+
+[```](./```)
+
+[a=$1](./a=$1)
+
+[b=$2](./b=$2)
+
+[](./)
+
+[while ((b!=0))](./while ((b!=0)))
+
+[do](./do)
+
+[        ((t=b))](./        ((t=b)))
+
+[	((b=a%b))](./	((b=a%b)))
+
+[	((a=t))](./	((a=t)))
+
+[done](./done)
+
+[echo $a](./echo $a)
+
+[```](./```)
+
+[](./)
+
+[three.sh](./three.sh)
+
+[```](./```)
+
+[read number](./read number)
+
+[fact=1](./fact=1)
+
+[i=1](./i=1)
+
+[while ((i<=number))](./while ((i<=number)))
+
+[do](./do)
+
+[	((fact=fact*i))](./	((fact=fact*i)))
+
+[	((i=i+1))](./	((i=i+1)))
+
+[done](./done)
+
+[echo $fact](./echo $fact)
+
+[```](./```)
+
+[README.md](./README.md)
+
diff --git a/Sem 4/labs/OS lab/exp3/readme.md b/Sem 4/labs/OS lab/exp3/readme.md
new file mode 100644
index 0000000..c6dbd11
--- /dev/null
+++ b/Sem 4/labs/OS lab/exp3/readme.md	
@@ -0,0 +1,11 @@
+
+[five.sh](./five.sh)
+
+[four.sh](./four.sh)
+
+[onetest.sh](./onetest.sh)
+
+[three.sh](./three.sh)
+
+[twotest.sh](./twotest.sh)
+
diff --git a/Sem 4/labs/OS lab/exp4/readme.md b/Sem 4/labs/OS lab/exp4/readme.md
new file mode 100644
index 0000000..048c1b6
--- /dev/null
+++ b/Sem 4/labs/OS lab/exp4/readme.md	
@@ -0,0 +1,9 @@
+
+[shell](./shell)
+
+[one.c](./one.c)
+
+[three.c](./three.c)
+
+[two.c](./two.c)
+
diff --git a/Sem 4/labs/OS lab/exp4/shell/readme.md b/Sem 4/labs/OS lab/exp4/shell/readme.md
new file mode 100644
index 0000000..3c34024
--- /dev/null
+++ b/Sem 4/labs/OS lab/exp4/shell/readme.md	
@@ -0,0 +1,5 @@
+
+[one.sh](./one.sh)
+
+[two.sh](./two.sh)
+
diff --git a/Sem 4/labs/OS lab/exp5/readme.md b/Sem 4/labs/OS lab/exp5/readme.md
new file mode 100644
index 0000000..a26c63e
--- /dev/null
+++ b/Sem 4/labs/OS lab/exp5/readme.md	
@@ -0,0 +1,3 @@
+
+[.open.c.swp](./.open.c.swp)
+
diff --git a/Sem 4/labs/OS lab/img/readme.md b/Sem 4/labs/OS lab/img/readme.md
new file mode 100644
index 0000000..a26c63e
--- /dev/null
+++ b/Sem 4/labs/OS lab/img/readme.md	
@@ -0,0 +1,3 @@
+
+[.open.c.swp](./.open.c.swp)
+
diff --git a/Sem 4/labs/OS lab/lab questions/quest1/README.md b/Sem 4/labs/OS lab/lab questions/quest1/README.md
index d632db3..f7dc411 100644
--- a/Sem 4/labs/OS lab/lab questions/quest1/README.md	
+++ b/Sem 4/labs/OS lab/lab questions/quest1/README.md	
@@ -1,68 +1,141 @@
-# this file contains the ans for the [pdf](./basic_commands_practise_all.pdf) above
 
-## Answers
+[# this file contains the ans for the [pdf](./basic_commands_practise_all.pdf) above](./# this file contains the ans for the [pdf](./basic_commands_practise_all.pdf) above)
 
-1. `touch quest1.txt`
+[](./)
 
-2. `touch {one,two.three}.txt`
+[## Answers](./## Answers)
 
-3. `echo "Hello World!" > quest3.txt`
-> `cat quest3.txt`
+[](./)
 
-4. `tr aeiou AEIOU`
-> write anything here
+[1. `touch quest1.txt`](./1. `touch quest1.txt`)
 
-5. `tee quest5.txt`
-> type anything here
+[](./)
 
-> and it goes to file as well
+[2. `touch {one,two.three}.txt`](./2. `touch {one,two.three}.txt`)
 
-6. `mkdir -p "ktu/fisat/csea/student"`
+[](./)
 
-7. `pwd`
+[3. `echo "Hello World!" > quest3.txt`](./3. `echo "Hello World!" > quest3.txt`)
 
-8. `whereis bash`
+[> `cat quest3.txt`](./> `cat quest3.txt`)
 
-9. `file <loction/u/got/above/for/bash>`
+[](./)
 
-10. `nano quest10.c`
+[4. `tr aeiou AEIOU`](./4. `tr aeiou AEIOU`)
 
-> paste the code
-```
-#include<stdio.h>
-void main(){
-	printf("hello");
-}
-```
-> `gcc quest10.c`
+[> write anything here](./> write anything here)
 
-> `ls -l ./a.out`
+[](./)
 
-> `chmod +x ./a.out`
+[5. `tee quest5.txt`](./5. `tee quest5.txt`)
 
-> `ls -l ./a.out`
+[> type anything here](./> type anything here)
 
-> `./a.out`
+[](./)
 
+[> and it goes to file as well](./> and it goes to file as well)
 
-11. `file ./a.out`
+[](./)
 
-12. `echo "Hello World!"`
+[6. `mkdir -p "ktu/fisat/csea/student"`](./6. `mkdir -p "ktu/fisat/csea/student"`)
 
-13. `history`
+[](./)
 
-14. `cd ../..`
+[7. `pwd`](./7. `pwd`)
 
-15. `ls | wc -l`
+[](./)
 
+[8. `whereis bash`](./8. `whereis bash`)
 
+[](./)
 
+[9. `file <loction/u/got/above/for/bash>`](./9. `file <loction/u/got/above/for/bash>`)
 
+[](./)
 
+[10. `nano quest10.c`](./10. `nano quest10.c`)
 
+[](./)
 
+[> paste the code](./> paste the code)
 
+[```](./```)
 
+[#include<stdio.h>](./#include<stdio.h>)
 
+[void main(){](./void main(){)
 
+[	printf("hello");](./	printf("hello");)
+
+[}](./})
+
+[```](./```)
+
+[> `gcc quest10.c`](./> `gcc quest10.c`)
+
+[](./)
+
+[> `ls -l ./a.out`](./> `ls -l ./a.out`)
+
+[](./)
+
+[> `chmod +x ./a.out`](./> `chmod +x ./a.out`)
+
+[](./)
+
+[> `ls -l ./a.out`](./> `ls -l ./a.out`)
+
+[](./)
+
+[> `./a.out`](./> `./a.out`)
+
+[](./)
+
+[](./)
+
+[11. `file ./a.out`](./11. `file ./a.out`)
+
+[](./)
+
+[12. `echo "Hello World!"`](./12. `echo "Hello World!"`)
+
+[](./)
+
+[13. `history`](./13. `history`)
+
+[](./)
+
+[14. `cd ../..`](./14. `cd ../..`)
+
+[](./)
+
+[15. `ls | wc -l`](./15. `ls | wc -l`)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[](./)
+
+[basic_commands_practise_all.pdf](./basic_commands_practise_all.pdf)
+
+[README.md](./README.md)
 
diff --git a/Sem 4/labs/OS lab/lab questions/readme.md b/Sem 4/labs/OS lab/lab questions/readme.md
new file mode 100644
index 0000000..ecdf3c2
--- /dev/null
+++ b/Sem 4/labs/OS lab/lab questions/readme.md	
@@ -0,0 +1,3 @@
+
+[quest1](./quest1)
+
diff --git a/Sem 4/labs/readme.md b/Sem 4/labs/readme.md
new file mode 100644
index 0000000..4860c42
--- /dev/null
+++ b/Sem 4/labs/readme.md	
@@ -0,0 +1,5 @@
+
+[Digi lab](./Digi lab)
+
+[OS lab](./OS lab)
+
diff --git a/Sem 4/removeAllTempFiles.bat b/Sem 4/removeAllTempFiles.bat
new file mode 100644
index 0000000..dfcca52
--- /dev/null
+++ b/Sem 4/removeAllTempFiles.bat	
@@ -0,0 +1,12 @@
+@Echo ON
+
+:Process
+:eof
+
+::process
+rem set t=""
+
+rem cd "C:\Users\Lijin\Desktop\Co-Science\Cs-Web\Sem 4" ; rm ./*~ -Recurse ; rm ./*/*~ -Recurse ; rm ./*/*/*~ -Recurse ; rm ./*/*/*/*~ -Recurse
+for /f %%F in ('dir /b /od /a-d *~') do del %%F
+::end
+
diff --git a/_.config.yml b/_.config.yml
new file mode 100644
index 0000000..c5d3bd0
--- /dev/null
+++ b/_.config.yml
@@ -0,0 +1,14 @@
+plugins:
+  - jekyll-relative-links
+relative_links:
+  enabled: true
+  collections: true
+include:
+  - CONTRIBUTING.md
+  - README.md
+  - LICENSE.md
+  - COPYING.md
+  - CODE_OF_CONDUCT.md
+  - CONTRIBUTING.md
+  - ISSUE_TEMPLATE.md
+  - PULL_REQUEST_TEM
diff --git a/_config.yml b/_config.yml
index fc24e7a..23165cf 100644
--- a/_config.yml
+++ b/_config.yml
@@ -1 +1,15 @@
-theme: jekyll-theme-hacker
\ No newline at end of file
+theme: jekyll-theme-hacker
+plugins:
+  - jekyll-relative-links
+relative_links:
+  enabled: true
+  collections: true
+include:
+  - CONTRIBUTING.md
+  - README.md
+  - LICENSE.md
+  - COPYING.md
+  - CODE_OF_CONDUCT.md
+  - CONTRIBUTING.md
+  - ISSUE_TEMPLATE.md
+  - PULL_REQUEST_TEM