Variable assignment (no spaces around =) in Bash Scripting - Cheat Sheet & Quick Revision

Recall & Review

beginner

Why should there be no spaces around the = sign in bash variable assignment?

In bash, spaces around = are not allowed because bash treats spaces as separators. Spaces would cause bash to misinterpret the command, leading to errors.

beginner

What is the correct way to assign the value hello to a variable named greeting in bash?

The correct way is greeting=hello. No spaces should be before or after the = sign.

beginner

What happens if you write greeting = hello in bash?

Bash will try to run a command named greeting with arguments = and hello, causing an error because greeting is not a command.

intermediate

How do you assign a value with spaces to a variable in bash?

You put the value in quotes without spaces around =. For example: message="hello world".

beginner

Is this valid in bash? name= John

No, it is invalid because there is a space after =. The correct form is name=John.

Which of these is the correct way to assign the value 10 to a variable x in bash?

A x= 10

B x = 10

C x=10

D x =10

In bash, no spaces are allowed around the equals sign during variable assignment.

What will happen if you run var =value in bash?

A Assign '=value' to 'var'

B Assign 'value' to 'var'

C Syntax error

D Run command 'var' with argument '=value'

Bash treats 'var' as a command and '=value' as its argument because of the spaces.

How do you assign the string 'hello world' to a variable message in bash?

A message="hello world"

B message = "hello world"

C message= 'hello world'

D message=hello world

The value with spaces must be quoted and no spaces around '='.

Which is NOT a valid variable assignment in bash?

A Both B and D

B count =5

C count=5

D count= 5

Spaces around '=' are not allowed in bash variable assignments.

Why does bash require no spaces around '=' in variable assignment?

A Because '=' is a special operator that must be attached to the variable name

B Because spaces separate commands and arguments

C Because spaces cause syntax errors in all programming languages

D Because '=' is a reserved word

Bash uses spaces to separate commands and arguments, so spaces around '=' break the assignment.

Explain why spaces are not allowed around the equals sign in bash variable assignment.

Think about how bash reads commands and arguments.

Show how to correctly assign a string with spaces to a variable in bash.

Remember how to handle strings with spaces.