Bash Shell Scripting - Assignment - passwd - Solution

The video tutorial guides viewers through developing a script to process a password file using both while and for loops. It begins with setting up a template and understanding the file's layout. The instructor demonstrates how to extract specific fields using the cut command and handle errors. The tutorial highlights the importance of the internal field separator (IFS) when using for loops to ensure correct processing of lines with spaces. The video concludes with a successful implementation of both loops, emphasizing the learning experience from encountering and resolving issues.

What is the purpose of the shebang line in a script?

• To declare a variable

• To specify the script interpreter

• To add comments

• To display output

What is the delimiter used in the password file discussed in the video?

• Colon (:)

• Tab

• Semicolon (;)

• Comma (,)

What is the significance of the first field in the password file?

• It is the user ID

• It shows the user's group ID

• It indicates the user's shell

• It represents the user's home directory

Which command is used to extract specific fields from a line in a script?

• sed

• awk

• grep

• cut

Which loop was initially used to process the password file in the script?

• For loop

• Do-while loop

• While loop

• Until loop

Which command is used to display the contents of a file in the script?

• cat

• ls

• touch

• echo

What condition is used to ignore lines with specific shell entries in the script?

• If the shell is /bin/sh

• If the shell is /usr/bin/zsh

• If the shell is /usr/sbin/nologin or /bin/false

• If the shell is /bin/bash

What is the role of the IFS variable in a for loop?

• To specify the input file

• To declare a function

• To define the script interpreter

• To set the internal field separator

What issue was encountered when using the for loop without setting the IFS variable?

• The script ran indefinitely

• The output was not displayed

• The fields were incorrectly split by spaces

• The script failed to execute

What was the final output of the script after implementing all the logic?

• No user entries

• Filtered user entries excluding /usr/sbin/nologin and /bin/false

• Only user entries with /bin/bash shell

• All user entries from the password file