71. . . . . . . . . command displays all the variables available in the current shell.
72. Which command is used for running jobs in the background?
73. Redirection is a process of switching of the standard stream of data.
74. Device files are used by the kernel for operating the device.
75. Which of the following symbols are used for accessing previous commands by event numbers?
76. Command substitution is enabled in single quotes also.
77. What is the output of who command?
78. For adding a new user to the system, we have to use . . . . . . . . command.
79. print statement is necessary for printing a line.
80. . . . . . . . . searches for a first instance of a pattern in the backward direction.
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