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I have a text file named blehbleh.txt and I want to use a command line to display the number of lines that it contains. How do I achieve this with a single command line?

I certify that I have read and understood the syllabus, instructor announcements & forums posts made during the first week, and that I will abide by the rules expressed therein.

I am trying to echo the $- variable in the context of a login, non-interactive shell. I thought I got it right and issued the following command line: bash –login -c “echo $-” This is what I got in response on the screen: himBH Why is this telling me that the command was executed in an interactive shell?! How do I fix this?

We want to use egrep to match lines of a text file named numbers.txt that contain at least 1 number between 0 and 255.   Examples of numbers that would be matched: 255, 254, 123, 98, 5, 0.   As an additional constraint, such a number cannot be headed by zeroes.  Examples of numbers that would not be matched: 2134, 256, 092, 05, 005 and 000.  Provide the command line to do so. 

I certify that I understand that, as a 3 credit offering, this course will require me to work every single week of the semester for at least 12 hours during spring or fall semesters 20 hours during summer semesters I also certify that I understand that these hours will have to be split into several work sessions, spread over the entire week.

We want to issue a single Bash shell command which will execute a program named myprog and perform the following redirections; – STDOUT will be redirected to a file named results_only – STDERR will be redirected to a file named errors_only If the file already exists, we simply overwrite it; our shell is not set to prevent this. Select all, if any, of the following shell commands which would fit the bill?

A friend asked me to help them out on the UNIX system they are remotely connected to. Problem is, I’m not even sure this is a Linux system! What shell command would I issue to display the name of the operating system?Select all that apply.

We want to create a folder name /home/tux/EDU/CIS4930/case_studies/ using a single command line and regardless of what our current working directory is. If, for some reason, the creation of the folder did not work, we want to display a message saying “Sorry, something went kablemo.”. On the other hand, if the creation of the folder went well, we want to cd into it. All this as part of the one command line.