To read from a file:

    

while(<FH>){ print; }      # Read one line at a time from file.
@lines = <FH>;             # Slurp all lines into an array.
print "@lines\n";

1.	The read Function (fread)
2.	Read file content to a scalar variable
3.	Read from a file
4.	Read hash value from a file
5.	Read line splitted by space
6.	Read only the last file line from a text file
7.	Read the first line of a local file
8.	Read till the end of the file
9.	Reading More than One Line
10.	Reading a directory all at once with an array: Use an array with the readdir command, instead of a scalar variable
11.	Reading from a Pipe
12.	Reading from a file
13.	Reading from the Filehandle
14.	Reading one line from the file handle STDIN.
15.	Reading the contents of a directory: change to that directory and then use the glob command
16.	Reads an entire input file into an array.
17.	Reads lines from a file and prints them.
18.	Using read function in while loop
19.	Using read function to read a file
20.	The read Function reads a number of bytes into a variable from a filehandle.
21.	Contents of the entire file are printed
22.	Numbering Lines
23.	To read a number of bytes from a file: $bytes_read = read(filehandle, $var, $length, $offset);

To read from a file: : file read « File « Perl