Searching & Extracting

Question 1

What linux command is used to read an entire file?

Answer 1

less

*cat can only view a few lines

Question 2

What linux command is used to read the beginning/end of a file?

Answer 2

head filetoread
tail filetoread

-n can be used to specify number of lines

Question 3

What linux command is used to locate files on the system?

Answer 3

find

• type d/f to specify directory or file
• name

Question 4

What linux command is used to search for text inside files?

Answer 4

grep charstofind fromlocation

Question 5

What linux command is used to organise text in a file?

Answer 5

sort

• r reverse alphabetic order
• R random

Question 6

What linux command is used to manipulate text by column?

Answer 6

cut

-c column i.e -c2-5 -c3-
-d delimiter -f field (used in conjunction)
> new file&raquo_space; append to file

Question 7

What linux command is used to word count a file?

Answer 7

wc

Question 8

How do you use find and grep to select only specific matching text?

Answer 8

find | grep

Question 9

What are regular expressions?

Answer 9

used to parse through text of certain arrangement

^ beginning of line
$end of line
. any single substituted character