less and more (paginated viewing) in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

Output of 'less' command with a specific key press

You run less on a text file with 100 lines. After opening, you press the spacebar key once. What happens?

Linux CLI

less sample.txt

A The display moves forward by one line only.

B The display moves forward by one full screen of lines.

C The display moves backward by one full screen of lines.

D The display exits immediately.

💡 Hint

Think about how 'less' paginates content and what the spacebar does.

In 'less', pressing the spacebar moves the view forward by one full screen of text, allowing you to read the next chunk.

💻 Command Output

intermediate

Behavior of 'more' when reaching end of file

You use the command more sample.txt to view a file. When you reach the end of the file, what does 'more' do?

Linux CLI

more sample.txt

A It automatically exits and returns to the shell prompt.

B It waits for user input to scroll further even though no more lines exist.

C It loops back to the start of the file.

D It displays an error message and exits.

💡 Hint

Consider what happens when you reach the end of content in pagers.

'more' exits automatically when it reaches the end of the file, returning control to the shell.

📝 Syntax

advanced

Correct command to search forward in 'less'

Which command inside 'less' allows you to search forward for the word 'error'?

Linux CLI

less /var/log/syslog

A ?error

B #error

C :error

D /error

💡 Hint

Think about how forward and backward searches differ in 'less'.

In 'less', typing '/' followed by a pattern searches forward, while '?' searches backward.

💻 Command Output

advanced

Output of 'more' with piped input

You run the command cat file.txt | more. What is the behavior of 'more' in this case?

Linux CLI

cat file.txt | more

A 'more' ignores the input and exits immediately.

B 'more' outputs the entire content without pagination.

C 'more' paginates the output, allowing scrolling page by page.

D 'more' waits for a filename argument and shows an error.

💡 Hint

Consider how 'more' handles standard input from pipes.

'more' can paginate piped input, showing one screen at a time.

🚀 Application

expert

Combining 'less' with environment variable for default options

You want 'less' to always start with line numbers shown and ignore case in searches. Which environment variable setting achieves this?

A export LESS='-N -i'

B export LESS='-n -I'

C export LESS='-N -I'

D export LESS='-n -i'

💡 Hint

Check 'less' man page for option meanings: -N shows line numbers, -i ignores case.

The '-N' option shows line numbers, and '-i' makes searches case-insensitive. Both are uppercase/lowercase sensitive.