b) 1.Unix 2.Unix 3.$os 4.Unix
b) cat file1.txt file2.txt > new.txt
c) The process id is <pid><pid>
d) some-var (some hyphen var)
a) cat filename | head | tail -6
d) /home/user1/proj/src/generic
c) The pipe operator provided by the shell can be used
c) Write standard error to abc
b) Write standard output and standard error to abc
d) Write standard output to abc & standard error to monitor
b) It would not read any files
b) echo foo >> /tmp/bar
b) Write data to the physical device sda