Question
In: Computer Science
A shell script foo contains the statement echo “$PATH $x”. Now define x=5 at the prompt,...
- A shell script foo contains the statement echo “$PATH $x”. Now
define x=5 at the prompt, and then run the script. Explain your
observations and how you can rectify the behavior.
Solutions
Expert Solution
The shell maintains a variable under PATH in its own environment.
PATH is set to a list of colon-delimited directories. You can display this list by simply evaluating the $-prefixed variable with the echo command:
Now I had been observe the differences between echo $PATH and
x=5 echo "$PATH $x" is:
From above displaying value along with the path of different directories in environment.
venereology answered 8 months agoRelated Solutions
A shell script foo contains the statement echo “$PATH $x”. Now define x=5 at the prompt,...
A shell script foo contains the statement echo “$PATH $x”. Now
define x=5 at the prompt, and then run the script. Explain your
observations and how you can rectify the behavior.
Write a shell script of the following: “A Multiple Choice Question that contains 5 questions and...
Write a shell script of the following: “A Multiple Choice
Question that contains 5 questions and each question carries 2
options. Choice will be given by the students. A record file is
created each time the script runs to store the answers along with
the total marks obtained. The record filename that has date and
timing information as well as the student name.
In shell script what is the reason this statement is not working? x=7 y=13 while [...
In shell script what is the reason this statement is not
working?
x=7
y=13
while [ $x -le $y ]
do
echo $x
x=x+2
done
why on while statement it has error?
2.x=7
y=13
while [$x \< $y ]
do
echo $x
let x=x+2
done
what does it mean \< ? and give me the reason how this
statement works
Consider the following Scheme function foo: (define (foo x) (cond ((null? x) 0) ((not (list? (car...
Consider the following Scheme function foo:
(define (foo x)
(cond
((null? x) 0)
((not (list? (car x)))
(cond
((eq? x '()) (foo (car x)))
(else (+ 1 (foo (cdr x))))))
(else (+ (foo (car x)) (foo (cdr x))))))
(8 pts)
Explain what the function computes and how. Don’t just restate
the function definition in English — explain the algorithm. Hint:
not all the code in this function does something useful.
(2 pts)
Show the result of executing the expression
(foo...
Write a brief shell script that will take in a specific file name, prompt the user...
Write a brief shell script that will take in a specific file
name, prompt the user whether they would like to gzip, bzip2, or xz
compress the file. Depending on response, the script then ought to
compress the provided file with the corresponding method
LINUX In Linux command line write a shell script ex1.sh that uses IF THEN to Prompt...
LINUX
In Linux command line write a shell script
ex1.sh that uses IF THEN to
Prompt the user to "Enter a number between 1 and 10". (Hint: Use
the 'echo' and 'read' commands in
the script. See the slide about the 'read'
command)
If the number is less than 5, print "The number is less than 5"
(Hint: You will read input into a variable; e.g. read NUM. In the
IF statement, enclose $NUM in quotes; e.g. "$NUM". Also, remember...
Examine the following shell script and describe its function line-by-line: #!/bin/bash echo -e "Which file would...
Examine the following shell script and describe its function
line-by-line:
#!/bin/bash
echo -e "Which file would you like to copy> --> \c"
echo -e "Which file would you like to copy? --> \c?"
read FILENAME
mkdir /stuff || echo "The /stuff directory could not be
created." && echo "The /stuff directory could not be
created."
cp -f $FILENAME /stuff && echo "$FILENAME was
successfully copied to /stuff"
Write a shell script that will create a new password-type file that contains user information. The...
Write a shell script that will create a new password-type file
that contains user information. The file should contain information
about the last five users added to the system with each line
describing a single user. This information is contained in the last
five lines of both the /etc/shadow and the /etc/passwd files.
Specifically, you should produce a file where each line for a user
contains the following fields: user name, encrypted password, and
shell. The fields should be separated...
Shell script program that asks a number between 5 to 9. If the input is not...
Shell script program that asks a number between 5 to 9. If the
input is not between 5 and 9, display an error message and ask
again.
Output
1
22
333
4444
55555
666666
7777777
88888888
999999999
1) Define the sets X ={ 1, 2, 3} and Y = {4, 5, 6}. Now,...
1) Define the sets X ={ 1, 2, 3} and Y = {4, 5, 6}. Now, define
the relation R from X to Y by xRy if and only if x − y is even.
Find all of the elements in R.
2) Define the relation R on ℤ by mRn if and only if 2|(m − n).
Show that R is an equivalence relation.
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