Which two Unix commands can we apply to create patches to convert one version of

Question

Which two Unix commands can we apply to create patches to convert one version of a file (or files) to another version?

Select one:

a. $ cut and $ paste

b. $ diff and $ comm

c. $ comm and $ patch

d. $ cut and $ comm

e. $ diff and $ patch

How can you display the non-printing characters in a text file called 'spam.txt' while using Unix?

Select one:

a. $ cat -display spam.txt

b. $ cat > spam.txt

c. $ cat -s spam.txt

d. $ cat -D spam.txt

e. $ cat -A spam.txt

If a file is tab-delimited, why is it best to use $ cut to extract fields rather than characters?

Select one:

a. $ cut does not perform well on character extraction.

b. Each line may contain different number of characters.

c. Calculating character positions within the line is easy.

d. $ cut does not provide an option to extract characters.

Which command does the opposite of $ cut? Rather than extracting a column of text from a file, it adds one or more columns of text to a file.

Select one:

a. $ comm

b. $ paste

c. $ join

d. $ add

e. $ copy

What does the option "-k 3.7" mean in a $ sort command?

Select one:

a. Use a sort key that begins at the 3rd field and ends at the 7th field

b. Use a sort key that begins at the 3rd character and ends at the 7th character

c. Use a sort key that begins at the 7th character within the 3rd field

d. Use a sort key that begins at the 3rd character within the 7th field

Explanation / Answer

(1) The two commands used to create patches and convert one version of file to another are:

(a) Cut and Paste

Syntax:

2. $ cat -v spam.txt is used to display non-printing characters in a file while using Unix. It is not mentioned in the options given. But this is the require command.

3. (c) Calculating character position within the line is easy. Since, if a file is tab-delimited, cut command is used for cutting one of several columns from a file (often a log file) to create a new file. If character position within a file is known, then it will be easy to cut a file to create a new file.

4. (b) paste: The opposite of cut command to add one or ore columns in unix.

5. (a) sort -k 3.7: It sorts the file begining from third field and ending at seventh field.

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