Parallel interface works efficiently for short transmittance
distance, for longer ranges the link cribs because of EMI
and other interferences.
Serial on the other hand supports longer ranges as it is a
sole carrier of bits
so long range and slow transmission :serial
short range and faster transmission : parallel
The redirection 2> abc implies a) Write file 2 to file abc b) Write standard output to abc c) Write standard error to abc d) none of the mentioned
cmd 2>&1 > abc will a) Write file2 to file1 b) Write standard output and standard error to abc c) Write standard error to abc d) Write standard output to abc & standard error to monitor
From where would the read statement read if the following statements were executed? exec < file1 exec < file2 exec < file3 read line a) It would read all the files b) It would not read any files c) It would read all the files in reverse order d) It would read only file3
Which of these is the correct method for appending "foo" in /tmp/bar file? a) echo foo > /tmp/bar b) echo foo >> /tmp/bar c) echo foo | /tmp/var d) /tmp/bar < echo foo
Executing cat /etc/password > /dev/sda as superuser will a) Write data into a regular file called /dev/sda b) Write data to the physical device sda c) Create a temporary file /dev/sda and write data to it d) None of the above
Which variable contains last background job process id a) $* b) $? c) $$ d) $!
The $ variables in a shell script context designates a) The runtime of the script b) Number of command line arguments c) PID of the shell running the script d) The exit status of the shell script
Which command can be used to test various file attributes a) if b) file c) test d) type
What is the output of the following command for bash shell echo linux $0 a) linux echo b) linux linux c) linux bash d) linux
? Specifies a) one or more character b) zero or more charecter c) one character d) None of the above
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