121. write system call returns -1 when . . . . . . . .
122. Apart from its use in redirection, /dev/tty can also be used as an argument to some commands.
123. script command is used for. . . . . . . .
124. For removing a link, . . . . . . . . is used.
125. Which option is used with the tail command for extracting bytes instead of lines?
126. Directories can also be opened, read and written in the same way as regular files.
127. Which of the following is used for creating user's environment?
128. How many types of permissions a file has in UNIX?
129. In ex-mode, current line is represented by . . . . . . . .
130. To remove a job from the queue, which option is used with at command?
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