Lists all .txt files containing the word "cheese".

Lists all files except those containing "cheese".

Moves all .txt files containing "cheese" to the current directory.

Deletes all .txt files containing "cheese".

Restarts the copying process if interrupted

Removes the source directory after copying

Renames the source directory

Copies files recursively

Lists all files starting with abc and ending with .txt

Lists only hidden files

Lists all files starting with either a, b, or c and ending with .txt

Lists only files starting with the letter a

One or more occurrences

No occurrences

Exactly one occurrence

Zero or more occurrences

Matches all files with .txt extension

Matches any one file with .txt extension

Matches zero or more characters before .txt

Matches exactly one character before .txt

grep "apple banana" filename

grep -E "apple.*banana|banana.*apple" filename

grep -r "apple banana" filename

grep "apple.*banana" filename

Both overwrite files

Both append to files

> overwrites a file, while >> appends to a file

> appends to a file, while >> overwrites a file

To store user account information

To configure system-wide services

To store encrypted passwords

To maintain the list of active processes

ls file[4-9].txt

ls file[!1-3].txt

ls file[abc].txt

ls file[1-3].txt

grep "cat|bat|rat" filename

grep "c|b|r" filename

grep "[cbr]at" filename

grep "(cat|bat|rat)" filename