Q. Shell variables are of ____ types.

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Q. Suppose ABD_DIR is a local variable. Then it will be accessible to the child process.

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Q. ____ command is used to display the environment variables only.

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Q. Which symbol is used for setting the PS1 prompt to show the current event number?

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Q. set command by default displays the variables in the current shell.

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Q. Which one of the following keyword is used with the set command to avoid overwrite existing file?

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Q. To prevent accident logging out, we can use ____ as a keyword with the set command.

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Q. Which of the following features of UNIX may be used for inter process communication?

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Q. In a system, if 5 people are currently using the vi editor. then the number of corresponding processes will be

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Q. The command echo welcome > /dev / tty

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Q. dev/null

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Q. The advantage of binary files over text files is that

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Q. The permission bits of a file noname, can be set to _rws_ _x_ _x by the command.

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Q. /bin/passwd has the user execution permission set to 's' because

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Q. If one doesn't want anyone else to read or write to a file named datfile, except through a program in a file filex , then he may use

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Q. Writing a C program that accepts input from keyboard, rather than from a file is advantageous because

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Q. Which of the following string functions can be used to find the last occurrence of a given character in a given string?

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Q. Consider the program:

main ( )
{
printf("He arose a victor from\n");
system ("date") ;
printf("the dark domain");
}

If a.out is the executable code corresponding to the above source code, then the command a.out > out f

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Q. The default permission bits of a file when it is created for the first time, is controlled by

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Q. Let x.c be a C source code. The command cc x.c > y

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