Searching and Extracting Data Flashcards

Which find option is used to search by file modification time within the last 2 days?

Answer: find . -mtime -2

find -mtime -2 finds files whose modification time is less than 2 days ago.

What does the `tr 'a-z' 'A-Z'` command do?

Answer: Translates lowercase letters to uppercase

tr translates characters; 'a-z' to 'A-Z' converts every lowercase letter to its uppercase equivalent.

Which grep option prints the line number before each matching line?

Answer: -n

grep -n prefixes each matching line with its line number in the file.

What does `uniq` do by default when given sorted input?

Answer: Removes consecutive duplicate lines

uniq removes consecutive duplicate lines, so input should be sorted first to eliminate all duplicates.

Which command searches for files larger than 100MB?

Answer: find . -size +100M

find -size +100M finds files whose size exceeds 100 megabytes.

How do you use grep to search recursively through all files in a directory?

Answer: grep -r pattern dir/

grep -r (or --recursive) searches through all files in the directory and its subdirectories.

What does `tail -f /var/log/syslog` do?

Answer: Follows the file and prints new lines as they are written

tail -f follows a file in real time, printing new content as it is appended.