71. . . . . . . . . command allows us to undo a number of changes that have been made to a single line before moving away from that line.
72. We can prefix repeat factor with word navigation commands.
73. Shell scripts need to be saved with an extension .sh .
74. To extract specific columns from a file, . . . . . . . . command is used.
75. We can use 'yy' command for copy and paste operation.
76. Which of the following is default permission set for ordinary files?
77. Which of the following function cannot be performed by mailx command?
78. Which command is used for creating directories?
79. Which option is used with cp command for linking files instead of copying?
80. perl variables have no type and no initialization.
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