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Problem: Convert DOS to Unix
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Apparently each line of a DOS file ends with \r\n whereas lines in Unix files
end with \n. [If you wish to create a "DOS" file in a UNIX system then 
go into vi and 
"$; a;  cntrl V; CR (return)" (here ";" simply indicate a new command)

Say you have two files: GenericDOS and OrdinaryUnix (both containing
a single line "hello kitty"). There are two ways to determine the
type of file

$ file GenericDOS
GenericDOS: ASCII text, with CRLF, LF line terminators

$ file OrdinaryUnix
OrdinaryUNIX: ASCII text


$ cat -e GenericDOS
hello kitty^M$

$ cat -e OrdinaryUNIX
hello kitty$ 


Now you wish to convert from DOS to Unix.  There are several solutions

$ tr -d '\015' <DOS-file >Unix-file
$ tr -d '\r' < DOS-file > Unix-file
$ sed 's/\r$//' DOS-file > Unix-file
$ perl -pi -e 's/\r\n/\n/g' DOS-File > Unix-File
$ sed 's/^M$//' DOS-file > Unix-file
  Here "^M" is obtained by "cntrl-V followed by cntrl-M"

In "vi" use thsi command
	:1,$s/^M//
	OR
	:%s/^M//
ps. I was not aware that "%=1,$" in vi