uli101_week5_practice

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Seneca College *

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101

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Computer Science

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Dec 6, 2023

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docx

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Uploaded by ChancellorDragonfly3067

ULI101 Redirection / Issuing Multiple Linux Commands _____________________________________________________________________________ When answering Linux command questions on this side or the back side of this page, refer to the following Inverted Tree diagram. The linux directory is contained in your home directory. Assume that you just logged into your Matrix account. Directories are underlined . linux |-- content | |-- assignments | `-- tests | |-- .answers.txt | `-- questions.txt |-- projects Questions: 1. Write a single Linux command to provide a detailed listing of all files in the /bin directory, sending the output to a file called listing.txt in the “projects” directory. (append output to existing file and use a relative pathname) ls -l /bin > linux/projects/listing.txt 2. Write a single Linux command to redirect the stderr from the command: cat a.txt b.txt c.txt to a file called error.txt contained in the “assignments” directory. (overwrite previous file’s contents and use only relative pathnames) cat a.txt b.txt c.txt 2> linux/content/assignments/error.txt 3. Write a single Linux command: cat ~/a.txt ~/b.txt ~/c.txt and redirect stdout to a file called “good.txt” to the “tests” directory and stderr to a file called “bad.txt” to the “tests” directory. (overwrite previous contents for both files and use only relative-to-home pathnames) cat ~/a.txt ~/b.txt ~/c.txt > ~/linux/content/tests/good.txt 2> ~/linux/content/tests/bad.txt 4. Write a single Linux command to redirect the stdout from the command: cat a.txt b.txt c.txt to a file called wrong.txt contained in the “projects” directory and throw-out any standard error messages so they don’t appear on the screen. (append output to existing file and use only relative pathnames) cat a.txt b.txt c.txt > linux/projects/wrong.txt 2> /dev/null 5. Write a single Linux pipeline command to display a detailed listing of the “projects “directory but pause one screen at a time to view and navigate through all of the directory contents. 1 PAGE

ULI101 Redirection / Issuing Multiple Linux Commands _____________________________________________________________________________ Use a relative-to-home pathname. ls -ld linux/projects | less 6. Write a single Linux pipeline command to display the sorted contents (in reverse alphabetical order) of the “linux” directory. Use a relative pathname. ls linux | sort -r 7. Assume that the text file called “.answers.txt” contains 10 lines. Write a single Linux pipeline command to only displays lines 5 through 8 for this file. Use only relative pathnames. cat linux/content/tests/.answers.txt | head -n 8 | tail -n 4 8. Write a single Linux pipeline command to only display the contents of the “assignments” directory whose filenames match the pattern “murray” (both upper or lowercase). Use an absolute pathname. 9. Write a single Linux pipeline command to display the number of characters contained in the file called “.answers.txt”. Use a relative-to-home pathname. cat ~/linux/content/tests/.answers.txt | wc -c 10. Write a single Linux pipeline command to display the number of lines contained in the file called “questions.txt”. Use a relative pathname. cat linux/content/tests/questions.txt | wc -l 11. Write a single Linux pipeline command to display only the first 10 characters of each filename contained in your current directory. Also, there is will be a lot of output, so also pause at each screenful so you can navigate throughout the display contents. Use a relative pathname. 2 PAGE

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