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I'm having trouble using sed to validate the length of an entry. I want to have a user enter a phone number of either length 7, 10 or 11. Only numbers are allowed. Does anyone know how to do this?...

I'm writing my own Unix ls command in c and I was wondering if anyone knows how to or can point me to a tutorial that shows me how to change the text color of the filename depending on if it's a...

Sorry Corona, you are right. I didn't realize that I was scanning the wrong directory. The directory only had two hidden files and they were . and .. and I don't display those. Thanks.

I'm writing a c program to list the files in a given directory but I also want to display the hidden files. I can't figure this out in c. Does anyone know how to do this? Here's the code I have so...

Thanks itkamaraj. The problem I'm having now though is that I am scanning the directory so the file that I'm using is stored in entry->d_name and when I call system("md5sum entry->d_name") it is...

Is it possible to call the unix command md5sum from within a C program. I am trying to write a C program that scans a directory and computes the MD5Sum of all the files in the directory. Whenever I...

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!

1. The problem statement, all variables and given/known data:

I need to...

Sorry. This shouldn't have been posted here. I actually have figured out the answer. Can you delete this post?

I just wondered if I'm understanding this command line correctly

cat 2>save1 0<memo | sort 2>save2 1>letter


This means that stdin will read from memo and if there is an error then stderr will...

Thanks Alister. I went ahead and used the grep and cut. I knew how to do that one but I just wondered if you could use sed. Portability is definitely an issue and I don't have GNU sed so I can't...

I am getting a parameter from a user and I need to use it to search and return the matching line numbers in a file. I am using this code:


recordNumber="$(sed -n '/'"$entry"'/{
=
d
}'...

Thanks Jim. Definitely appreciated.

Bill

Hi everyone. I am trying to write a bash script that will copy files from one directory to another but I need to be able to check the directory that I'm copying the files to and see if the file...