$cat fileName //show the contents of the file
$grep text < fileName //show the lines that contain the word “test” inside the fileName
$grep -l text *.txt //show all .txt files with “text” word on those
$rev fileName //reverse the contents of the file
$VARIABLE=VALUE //set values to a variable
$echo $VARIABLE //see the value of the variable
$ export VERIABLE //set environment vatiable
#!/bin/bash //first line to write a script
1. Download Eclipse SVN plugin ( subclipse)
a) Go to Help menu of Eclipse -> Add New Software -> add URL (http://subclipse.tigris.org/update_1.6.x)
2. Create a SVN repository anywhere you want (e.g. your university server, other SVN repository providers like assembla)
Use command Line to create a repository:
svnadmin create --fs-type fsfs MyNewRepository
3. Now share/upload your your Eclipse project to the SVN repository
a) Right Click on the eclipse project -> Team -> Share project -> Use Existing Repository -> Add URL -> use user Name/password for your repository
When uploading to a server that does not allow http rather use ssh, use:
svn+ssh://user@ssh.yourdomain.com/path
//you would need to provide your username along with URL
rather than http://…
//http if that server or free space allows http or web access to the repository
4) Team -> Commit – to upload your changes from local
5) Team -> Update – to upload others’ changes to your local
1. A process is a program/set of codes in execution (running state)
2. Each program on OS that is running is a process
3. Each process concurrently and separately run with other process
4. Inside each process (a program in execution), if several parts of it need to run concurrently, then each concurrently running parts of a process is called thread or lightweight process
1. Insert the Ubuntu CD and select “Install without changing current file systems” //this will open the Live CD boot
2. Run “Terminal” from Applications -> Accessories -> Terminal
3. $ sudo grub
4. grub> find /boot/grub/stage1 // it will return (hd? , ?)
5. root (hd0, 4) //previous command at step 4, returned (hd0,4) , and make sure you typed a “space” after root
6. setup (hd0) // again make sure to put a space after setup.
//This will recover the grub
1. echo $((2>3)) //expressions
2. test 2 > 3 && echo “Yes” //condition check
3. read -p “Prompt” $variable1 $variable2 //reading from console
4. echo “today is $(date)”
5. var=10 //declaring variable, no space before or after =
6. declare -r y=10 //creating constant or read only variable
7. unset var //frees the variable
8. declare -i y=10 //creating int variable
9. find $HOME -name *.c //finding all c files inside home
10. printf “%s\n” “$varName” //prints
11. sleep 3 //sleeps for 3 sec
12. if condition //if condition
then
command1
command2
..
commandN
fi
13. if condition //if-else condition
then
command1
else
command2
fi
14.
if condition //if-else-if condition
then command1
elif condition2
command2
elif condition3
command3
else
fi
15. Logical AND, && // Run second command only if first is successful.
16. Logical OR, || // Run second command only if first is successful.
17. grep text file.ext //search text inside a file
18. [ condition ] //condition checking similar to test
19. case $variable-name in
pattern1)
command1
commandN
;;
pattern2)
command1
…
;;
esac
20.
for var in item1 item2 … itemN
do
command1
command2
commandN
done
2. //declaring function
die()
{
echo “An error occurred.”
}
>die //call it
Reference : http://bash.cyberciti.biz/guide/Shebang *click the right top arrows to move forward pages
$ sudo apt-get install ghc6 //install
$ ghci //run Haskell
Prelude> putStrLn “Hello World”
Prelude> Hello World //printing into standard output
……………………..
Prelude> :quit //quit from Haskell compiler+interpreter
///////////////////////////////////
creating a Haskell file, compile , run (load)
$ vi File.hs //create haskell file with .hs extension
$ ghci //start Haskell
Prelude> :load File.hs
*Main> File 10 // running File with argument = 10
……… another way from shell without running ghci first …
//compile and generate executable output file named outFile,
//assumed File.hs is already been created with a “main”
$ ghc -o outFile File.hs
$ ./outFile // run the executable
//use Tab for auto complete option for commands
Use ccrypt
Install
>> sudo apt-get install ccrypt
Encrypt, command and provide key twice
>> ccrypt -e File
Decrypt, command and provide key once
>> ccrypt -e File.cpt
>> sudo apt-get install wicd
//will remove default Network Manger that works only for wired connections and sets up wicd for both wired and wireless
>> java -jar file.jar
Edit
>>vi or gedit file.cpp
Compile
>> g++ file.cpp -o out
Run
>> ./out
or
>> ./out inp.in //providing command line input
