Linux Basics

Assignment in Linux?

• variable = value

• variable=value

• variable <- value

• variable<-value

Variable substitution in a string

• $variable

• $(variable)

• $((variable))

Command substitution in a string

• $command

• $(command)

• $((command))

Mathematical expression evaluation in Linux

• $expresson

• $(expression)

• $((expression))

How to create a new file in Linux using command line?

• touch

• mkdir

• cp

• rm

How to count the number of lines in a file in Linux?

• wc -l

• ls -l

• grep -c

• cat -n

How to rename a file in Linux using command line?

• cp

• rm

• mv

• ls

How to delete a directory and its contents in Linux?

• rmdir directory_name

• delete directory_name

• rm -d directory_name

• rm -r directory_name

What is the command to check the current date and time in Linux?

• time

• date

• datetime

• now

What is the command to list all files in a directory in Linux?

• ls

• rm

• cd

• dir