71. expr can perform . . . . . . . . arithmetic operations.
72. $ cd . . is used to move . . . . . . . . level up in the file hierarchy.
73. Programs and process are synonymous.
74. The command cd * will work.
75. Which one of the following is not an environment variable?
76. . . . . . . . . command displays the list of all open files and processes.
77. Which command is used to redo the changes made by the undo command?
78. set command by default displays the variables in the current shell.
79. Which of the following command will list all the hidden filenames in our directory having at least three characters after the dot (.)?
80. Which one of the following keys are used to moving cursor rightwards along a line?
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