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    <p>Possibly a dumb answer but in my terminal I would have to type in:</p> <pre><code>./factorial.awk </code></pre> <p>where the file is factorial.awk.</p> <p>You could edit your path environment variable to include . but ./ should work just fine I think. And adding . to $PATH could prove to be very dangerous in some situations where you would run code that you did not expect to.</p> <p>Does that work??</p> <p>EDIT:</p> <p>./factorial.awk -bash: ./factorial.awk: /usr/bin/gawk: bad interpreter: No such file or directory</p> <p>That says that it ran the file but could not find the program gawk. Please type in 'which gawk' and then 'which awk'.</p> <p>Is your first line supposed to be:</p> <pre><code>#!/usr/bin/awk </code></pre> <p>Also, just to amuse me, type in:</p> <pre><code>sudo apt-get install gawk </code></pre> <p>That will make sure you actually have gawk on your system.</p> <p>EDIT2: I took a look at your code and this is what I have now. I removed two quotes and a dash.</p> <pre><code>#!/usr/bin/gawk # I think we do not need these (p.179) so I comment them out, since I do not know where else to put them. # The same bug occurs also with them. #fact = number #for (x = number -1 ; x &gt; 1; x--) # fact *= x awk # factorial: returns factorial of user-supplied number BEGIN { printf("Enter number: ") } $1 ~ /^[0-9]+$/ { # assign value of $1 to number &amp; fact number = $1 if (number == 0) fact = 1 else fact = number #loop to multiply fact*x until x = 1 for (x = number - 1; x &gt; 1; x--) fact *= x printf("The factorial of %d is %g\n", number, fact) #exit -- saves user from typing ^-d exit } # if not a number, prompt again. { printf("\nInvalid entry. Enter a number: ") } </code></pre>
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    1. POUnable to make a factorial function in AWK
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    1. USRobert Massaioli
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    1. COI get the following errors: http://dpaste.com/37585/
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      1. USLéo Léopold Hertz 준영
    2. COIs your first line correct? Please see the edit.
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      1. USRobert Massaioli
    3. COThe dpaste.com example shows you using 'sudo' to run 'chmod'; that is a dangerous set of practices to get into. Get out of them now, before you break your system catastrophically. For scripts you write, it should never be necessary to use sudo to change the permissions. You should be working in your own territory on your own file where you can change permissions without needing root authority.
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      1. USJonathan Leffler
 

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