51. Which symbol is used as a shorthand for using the last argument to the previous command?
52. We should avoid filenames starting with a - (hyphen).
53. . . . . . . . . command allows superuser to communicate with users.
54. To check if the file exists and is executable we have to use . . . . . . . . option with test.
55. We can also use -n option with tail command.
56. The command df. will . . . . . . . .
57. Which system call is used by the parent process to wait for the child process to complete?
58. Which option is used for the recursive functioning of chmod command?
59. Which symbol is used to connect different streams?
60. The sources from where the signals can be generated are:
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