Why does the non-zero and the zero operator both return true in the shell script? This...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Why does the non-zero and the zero operator both return true in the shell script? This makes no sense. Please see the following small script I have written. I set a variable 'zero' to have nothing. I also get the same results if I set 'zero'¹ to "" or zero="" zero= #the below code prints "is not length zero" if [ -n $zero ] ; then echo "$zero is not length zero" ; fi #the below code prints if [ -z $zero ]; then " is length 0" echo "$zero is length 0"; fi Why does the non-zero and the zero operator both return true in the shell script? This makes no sense. Please see the following small script I have written. I set a variable 'zero' to have nothing. I also get the same results if I set 'zero'¹ to "" or zero="" zero= #the below code prints "is not length zero" if [ -n $zero ] ; then echo "$zero is not length zero" ; fi #the below code prints if [ -z $zero ]; then " is length 0" echo "$zero is length 0"; fi
Expert Answer:
Related Book For
Posted Date:
Students also viewed these programming questions
-
The following additional information is available for the Dr. Ivan and Irene Incisor family from Chapters 1-5. Ivan's grandfather died and left a portfolio of municipal bonds. In 2012, they pay Ivan...
-
The site http://virtualpiano.net features an online player piano. If you click on the Key Assist menu just above the piano keyboard, and then Keyboard Keys, you will see that each key is labelled...
-
Managing Scope Changes Case Study Scope changes on a project can occur regardless of how well the project is planned or executed. Scope changes can be the result of something that was omitted during...
-
Roles define the manager. Do you agree or disagree with this statement? Discuss what you think managers do.
-
Some U.S.-based MNCs have been maintaining a very large amount of cash in foreign countries, because they would be subject to a corporate income tax on these funds if they were remitted to the...
-
The following are the balances of the assets, liabilities, and equity of Jerome?s Coffee Shop at March 31, 2018: Requirements 1. What type of business organization is Jerome?s Coffee Shop? 2. Prepare...
-
This case stems from a rocky relationship between two Texans. Lawrence Shipley was the president of Shipley Do-Nut Flour & Supply Co., and Andrea Vasquez was a substitute school teacher in the...
-
MicroProducts, Incorporated (MPI) manufactures printed circuit boards for a major PC manufacturer. Before a board is sent to the customer, three key components must be tested. These components can be...
-
A 480-g iron pan is heated on a stove to a temperature of 130 C. The pan is then dropped into a partially-filled sink of water at 20 C. The final temperature reached by the sink and the pan is 40 C....
-
During the Plan Order Phase, the hours for the Receive Order phase (marked with an *) are actual times, as this work has already been performed. In addition to these internal labors costs, the...
-
Why and when was the Sherman Act passed - was it meant to be directed to labor union practices? How did the Court interpret the Act with regard to labor union practices? Cite case law to support your...
-
Develop a scoring rubric to validate, rate, and rank candidates in order to be able to identify the top three candidates. How would reliability and validity affect the evaluation of this measurement?
-
food preparation list for tonkotsu ramen stock, pho stock, oxtail soup (kkori gomtang), veg stock(clear vegetable soup), hot and sour soup, miso soup, tom yum soup,bun bo hue, kimchi jjigae(kimchi...
-
Technical Analysis: Interest Rate Risk Management at Union Carbide Corporation Please provide me excel based analysis
-
With your knowledge of the differences between awards and enterprise agreements explain the impact that these have on your preparation of staffing rosters.
-
Discuss the objectives of case analysis and provide a clear and detailed statement of the organizational problem that you have selected for your major case analysis. In a well-written response at...
-
The figure shows a bolted lap joint that uses SAE grade 8 bolts. The members are made of cold-drawn AISI 1040 steel. Find the safe tensile shear load F that can be applied to this connection if the...
-
Complete and balance each combustion reaction equation: a. C4H6(g) + O(g) C. CS(s) + O(g) b. C(s) + O(g) d. C3H8O(l) + O(g)
-
Find the radius (r) in centimeters of a spherical water droplet with a volume (V ) of 0.058 cm 3 . For a sphere, V = (4>3) r 3 . GIVEN: V = 0.058 cm FIND: r in cm CONCEPTUAL PLAN V 4 v=mr V= 3 r...
-
The American Dental Association recommends that an adult female should consume 3.0 mg of fluoride (F ) per day to prevent tooth decay. If the fluoride is consumed in the form of sodium fluoride...
-
Look back at Table 15.1. Show that y4 will exceed y3 if and only if the forward interest rate for period 4 is greater than 7%, which is the yield to maturity on the 3-year bond, y3. Table 15.1...
-
Suppose the interest rate decreases to 9% as an annual percentage rate. What will happen to the prices and durations of the two bonds in Spreadsheet 16.1? A B C D E F G 1 Time until PV of CF 2...
-
a. In Concept Check 16.1, you calculated the price and duration of a 2-year maturity, 8% coupon bond making semiannual coupon payments when the market interest rate is 9%. Now suppose the interest...
Study smarter with the SolutionInn App