81. Which symbol is used to change permissions for hidden files?
82. pr command adds . . . . . . . . lines of margin at the top and bottom.
83. What does the following command do?
$ kill %2
$ kill %284. Which of the following is not a wild-card?
85. Which of the following functions is used for handling environment variables of a process?
86. When touch command is used without any option but with an expression, which of the following timestamps are changed?
87. We can perform word navigation in vi editor.
88. Which of the following is a built-in variable for awk?
89. Which option is used with the cat command for displaying file with line numbers?
90. We can specify the filename with ':w' command.
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