103.2 Process Text Streams with Filters

Question 1

Text Streams

sort numerically or alphabetically starting by default at column 0

Answer 1

sort

Question 2

Text Streams

numbering the lines in a file or input stream can be all lines or just lines with data

Answer 2

nl

Question 3

Text Streams

abbreviation for word count but can do a lot more

Answer 3

wc

Question 4

Text Streams

changes tabs in file to specific number of spaces - default 8

Answer 4

expand

Question 5

Text Streams

command that will allow the extraction of field(s) or column(s) of data from a particular location in the indicated file

Answer 5

cut

Question 6

Text Streams

combines two files together without removing any data - concat style

Answer 6

paste

Question 7

Text Streams

combines two files together but removes redundant fields (database style) based on the first field (key)

Answer 7

join

Question 8

Text Streams

allows you to extract only ‘unique’ lines of data from a file

Answer 8

uniq

Question 9

Text Streams

similar to cat command in that it will display contents of a file but displays only a certain number of lines form the top - default 10

Answer 9

head

Question 10

Text Streams

similar to cat command in the it will display contents of a file and it is the oppisite of the head command - only displays a certain number of lines from the bottom of the file - default 10

Answer 10

tail

Question 11

Text Streams

allows you to take a file with a number of records and split it into multiple files that contain part of the original data

Answer 11

split

Question 12

Text Streams

display a file - top to bottom in full to standard output

Answer 12

cat

Question 13

Text Streams

same as cat but in reverse

bottom to top in full to standard output

Answer 13

tac

Question 14

Text Streams

allow save display of binary file to standard output terminal with having to recover with a clear or rest of terminal

Answer 14

od

Question 15

Text Streams

commonly used to format a source file or other text only files to be printed and adds a header with the date of job, the file and pagination (page number at top)

Answer 15

pr

Question 16

Text Streams

used to formation files for printing however is limited to wrapping longer lines of put and commonly used with the pr command

Answer 16

fmt

Question 17

Text Streams

allows you to change one or more chars matching a pattern in a file or stream - not intended to substitute entire words or phrases

Answer 17

tr

cannot be used to operate on a file directly the file intended has to be treated as a stream

Question 18

Text Streams

very powerful stream editor can quickly process and perform complex actions on streams of text

Answer 18

sed

makes use of regular expressions often called regex to determine what to perform its ops on in the stream

Question 19

Text Streams

allows paginate paging through text files one screen at a time

Answer 19

more

Question 20

Text Streams

similar to more however also allows movement through the file backwards and is considered faster as it does not read the entire file before starting display

Answer 20

less