Basic Unix commands-3

11. uname command

Syntax: uname [options]

Description:    Used to print system Information

-s    prints the kernel name
-n    print the network node hostname
-r    prints the kernel release
-v    print the kernel version
-m    prints the machine hardware name
-o    prints the operating system

12. bc command

It is used for command line calculator. It is similar to basic calculator.

Syntax: bc [option]

bc starts by processing code from all the files listed on the command line in the order listed. After processing all the files bc reads from the standard input. Code is executed as it is read.

-q    To avoid bc welcome message
-l    To include math library functionalities
quit    to quit the calculator.

13. tty Command

prints the file name of the terminal connected to standard input. It writes the name of the terminal that is connected to standard input onto standard output.
It does not require any additional argument

Syntax: tty

14. stty command

It sets certain terminal I/O modes for the device that is the current standard input. Without arguments, it writes the settings of certain modes to standard output.

Syntax: stty

15. cat Command

Main functions of cat commands are

  1. to create new files
  2. Display the contents of an existing file
  3. Concatenate the content of multiple files and display it.

syntax: cat [options] [file name]

Options

-b    add line numbers to non blank lines
-e    displays a $ (dollar character) at the end of each line
-n    add line numbers to all lines
-s    removes all the blank lines and replace it to single line.
-t    show ^I instead of tabs.

#creating new file
cat > file-name.txt

Above syntax creates test.txt file and allow us to insert content in this file.
After inserting content you can use clt+d to exit the file.
If file with same name exist then it will overwrite that file.
Combining two text files

cat test.txt file.txt

Comments

Anonymous said…
Excited for next post
January 6, 2021 at 8:56 PM
Post a Comment

YouTube

Popular posts from this blog

GTU OOP Program - 18

Image
18). Write a program that moves a circle up, down, left or right using arrow keys. import javafx.application.Application; import javafx.geometry.Insets; import javafx.scene.Scene; import javafx.scene.layout.Pane; import javafx.scene.paint.Color; import javafx.scene.shape.Circle; import javafx.stage.Stage; public class Program_18 extends Application { @Override public void start(Stage primaryStage) { Pane pane = new Pane(); pane.setPadding(new Insets(20, 20, 20, 20)); Circle circle = new Circle(20, 20, 20); circle.setFill(Color.RED); pane.getChildren().add(circle); pane.setOnKeyPressed(e -<{ switch (e.getCode()) { case UP: circle.setCenterY( circle.getCenterY() < circle.getRadius() ? circle.getCenterY() - 10 : circle.getCenterY()); break; case DOWN: circle.setCenterY(
Get Details

GTU OS Program - 7

Image
7. Write a menu driven shell script which will print the following menu and execute the given task. MENU 1) Display calendar of current month 2) Display today’s date and time 3) Display usernames those are currently logged in the system 4) Display your name at given x, y position 5) Display your terminal number 6) Exit Complete code of the program i=0 while [ $i != 6 ] do echo "Menu 1. Display calender of current Month 2. Display today's date and time 3. Display usernames of those who are currently logged in the ststem 4. Display your name at given x, y position 5. Display Terminal Number 6. Exit Choose your option and enter corresponding value" read i case "$i" in 1) calender="$(cal)" echo "Here is your Calender " echo "$calender" ;; 2) current="$(date)"
Get Details

GTU OS Program - 3

Image
3. Write a shell script to generate marksheet of a student. Take 3 subjects, calculate and display total marks, percentage and Class obtained by the student. Make a file called marksheet.sh using vim. If you want a full guide to vim than you can check this post. tkanu025@hp:~/lab_solutions$ vim marksheet.sh When you will hit enter than it will open a window like the one below. This is an editor and Here you can write your code. Press i to enter into the insert mode Write full code there like this echo "Enter marks(out of 30) of " read -p "Subject 1: " s1 read -p "Subject 2: " s2 read -p "Subject 3: " s3 sum=`expr $s1 + $s2 + $s3` echo "Sum of marks of 3 subjects is : "$sum per=`expr $sum \* 10 / 9` echo "Percentage: "$per if [ $per -ge 60 ] then echo "you got Distinction" elif [ $per -ge 50 ] then echo "you got First class" elif [ $per -ge 40 ] then
Get Details