A systems administrator needs to append output of ls '"lha /opt command to the contents of a test.txt file.
Which of the following commands will accomplish this?
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A. B. C. D.C.
https://www.cyberciti.biz/faq/linux-append-text-to-end-of-file/The correct command to append the output of ls "lha /opt to the contents of test.txt is option C: ls "lha /opt >> test.txt.
Here is an explanation of each option:
A. ls "lha /opt > test.txt: This command redirects the output of the ls "lha /opt command to test.txt, but it will overwrite the contents of test.txt if it already exists. This option is not appropriate for appending output to an existing file.
B. ls "lha /opt < test.txt: This command redirects the input of the ls "lha /opt command from test.txt, but it will not append the output of the command to the contents of test.txt. This option is not appropriate for appending output to an existing file.
C. ls "lha /opt >> test.txt: This command appends the output of the ls "lha /opt command to test.txt. The >> operator is used to append to the file instead of overwriting it. This is the correct option for appending output to an existing file.
D. ls "lha /opt << test.txt: This command is a here-document that provides input to the ls "lha /opt command. It is not appropriate for appending output to an existing file.
Therefore, option C is the correct command to use in this scenario.