Bash Linux commands

Copy one or more files to another location

cp

Daemon to execute scheduled commands

cron

Schedule a command to run at a later time

crontab

Split a file into context-determined pieces

csplit

Divide a file into several parts

cut

Display or change the date & time

date

Desk Calculator

dc

Convert and copy a file, write disk headers, boot records

dd

Data recovery tool

ddrescue

Declare variables and give them attributes •

declare

Display free disk space

df

Display the differences between two files

diff

Show differences among three files

diff3

DNS lookup

dig

Briefly list directory contents

dir