R V College of Engineering
Department of Master of Computer Application
I Semester 'A' Section - ASSIGNMENT
Subject Code : 10MCA14
Date : 19 -12-2011
Subject Title
: Introduction to UNIX Submission Date : 02-01-2012
Faculty Name
: Sudha M Max. Marks: 10
Group 1: Roll No. : 1 – 10
1. Explain the Mechanism of Process
Creation. 2.5 Marks
2. Device pipeline to : 0.5x5=2.5 Marks
i.
list the
five largest ordinary files in the directory including the dot files.
ii.
display
files with all attributes and count the number of files listed.
iii.
search the
/etc/passwd file and extract the 1st and 6th field and
save it in a file “myetcpwd”
iv.
search the
/etc/passwd file and extract the 1st and 6th field
display it on the standard output device
and save it in a file “myetcpwd”
v.
list all
the ordinary files in the current directory
3.
Write a
script that accepts a compressed filename as argumentc(which could be .gz, .bz2
or .zip). It looks at the extension and
decmpresses the file using the correct decompression program, but only if the
decompressed file (or one with the same name) does'nt exist. The script should include proper validation and
should not fail under any condition.
Group 2:
Roll No. : 11 - 20
1. Explain in detail the Shell's
Interpretive Cycle 2.5 Marks
2. Device pipeline to : 0.5x5=2.5 Marks
1.
list the
five smallest ordinary files in the directory including the dot files.
2.
display all
c files with all attributes and count the number of files listed.
3.
match all
lines that do not match the pattern “sales” in the file emp.lst
4.
store the
output of the previous pipeline in the file “otherthansales” and display it on
the standard output device too.
5.
search the
/etc/passwd file and extract the first four fields and save it in a file
“myetcpwd”
3.
Write a
script that behaves both interactive and non interactive mode. When no arguments are passed, it picks up
each 'C' program from the current directory and lists the first 10 lines. It
then prompts for deletion of the file. It
the user supplies arguments with the script, then it works on those files.
Group 3:
Roll No. : 21 - 30
1. Write a detail note on background
processes in UNIX 2.5 Marks
2. Device pipeline to : 0.5x5=2.5 Marks 1. list the five largest
ordinary files in the directory including the dot files.
2. display files
with all attributes and count the number of files listed.
3. Search for
all directors and replace them “managing director”
4. search the
/etc/passwd file and extract the 1st and 6th field and
save it in a file “myetcpwd”
5. search the
/etc/passwd file and extract the 1st and 6th field
display it on the standard output device and save it in a file “myetcpwd”
3.
Write a
script that looks up every “.c” file in the current directory for the string
printf or fprintf. If found, the script
adds the statement #include <stdio.h> at the begining of the file but
only if it does not have it included.
Group 4:
Roll No. : 31 - 40
1. Explain in detail about Proces and its
states. 2.5 Marks
2. Device pipeline to : 0.5x5=2.5 Marks
vi.
list the
all the files in the filesystem and display it on the standard output
device and save it in the file
myfilesystem.
vii. Recursively search all files in the path
/home/mca with all file attributes and count the number of shell scritps
present in the given path
viii.
search all
employees working in the marketing department and store them in the file
“marketingpersonnel”
ix.
search the
/etc/passwd file and extract the 1st and 6th field and
save it in a file “myetcpwd”
x.
search the
/etc/passwd file and extract the 1st and 6th field display
it on the standard output device and
save it in a file “myetcpwd”
3. Write a shell script that looks at every
component of PATH and checks whether the directory exists and is also accessible. 5
Marks
Group 5:
Roll No. : 41 - 50
1. Explain in detail the sed command and the
instructions used by sed. 2.5
Marks
2. Device pipeline to : 0.5x5=2.5 Marks
xi.
list the
five largest ordinary files in the directory including the dot files.
xii. display files with all attributes and count the
number of files listed.
xiii.
search all
employees working in the marketing department and store them in the file
“marketingpersonnel”
xiv.
search the
/etc/passwd file and extract the 1st and 6th field and
save it in a file “myetcpwd”
xv. search the /etc/passwd file and extract the 1st
and 6th field display it on the standard output device and save it in a file “myetcpwd”
3. You have two files ,foo1 and foo2 ,copied
fom two /etc/passwd files on two machines. How do
you print a list of users who are i) present in foo1 but not in foo2,ii)present
in foo2 and not in foo1,iii)present in
both files.
Group 6:
Roll No. : 51 - 60
1. Explain in detail the various modes of vi
editor and commands in respective modes.
2.5 Marks
2. Device pipeline to : 0.5x5=2.5 Marks
i.
list the
five largest ordinary files in the directory including the dot files.
ii.
display
files with all attributes and count the number of files listed.
iii.
match all
lines that do not match the pattern “sales” in the file emp.lst
iv.
store the
output of the previous pipeline in the file “otherthansales” and display it on
the standard output device too.
v.
search the
/etc/passwd file and extract the first four fields and save it in a file
“myetcpwd”
3. You have a number of 'C' programs that
contain comment lines at the begining of each program. The lines with the */ followed by the first
line of comment, but the terminator line has
*/ as the only characters in the line.
Remove these comments from all files.
