Difference between revisions of "BASH/C2/More-on-Loops/English-timed"

| Welcome to the spoken tutorial on  '''Nested for loop in BASH'''

| In this tutorial, we will learn  '''Nested for loop''' With the help of an example.

| To record this tutorial I am using '''Ubuntu Linux''' 12.04 '''Operating System''' and '''GNU BASH''' version 4.1.10

|For relevant tutorials, please visit our website which as shown http://spoken-tutorial.org

|A loop within a loop is known as '''nested loop.'''

| Let us see the syntax Outer '''for loop''' '''expression 1, 2, 3'''

|Inner '''for loop''' '''expression 1, 2, 3'''

| '''statement 1''' '''statement 2'''

| Closing Inner '''for loop''' Closing Outer '''for loop'''

| First let us go through the directory structure.

| We have subdirectories '''test''', '''test2''' and '''test3''' and a '''Bash script'''.

| Now we will move on to our code.

|This program displays all the files within each subdirectory.

|Please note that the same can be acheived with a single line command '''ls -1 (hyphen one) -R(hyphen R) test*(test asterix)'''

| Note that the name of our''' Bash script''' is''' nested-(Hyphen)for dot sh'''

|First '''echo''' line will display the sub-directories name

| This is the inner '''for loop'''.It will check for files present within the directories.

|'''ls '''displays the directory content.

| Here we list the files.'''done''' ends the inner '''for loop'''.

|This command prints a vertical line after completion of every cycle of outer '''for-loop.'''

| Let us execute the program.

 

|Open the '''terminal''' by pressing '''ctrl+alt+t''' keys simultaneously on your keyboard.

|Type '''cd Desktop'''. Let us go in the folder '''simple-(Hyphen)nested-(Hyphen)for'''

| Type '''chmod plus +x nested-(Hyphen)for dot sh'''

|Type dot slash '''nested-(Hyphen)for dot sh'''

|Press '''Enter.'''

 

|The output is displayed. It shows  Files in '''test''' directory. Files in '''test2''' directory.And files in '''test3''' directory.

|Let us summarize.In this tutorial we learnt,'''Nested for loop'''

| As an assignment

|Retype '''nested (hyphen)-for dot sh bash script using nested while loop.'''

|Save your program with the name ''''nested-(hyphen)while Dot sh''''

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|This is Ashwini Patil from IIT Bombay.Thank You for joining.