Tool Command Language- Lecture 9 (files)

In this lecture we will see how to read file from disk
The general format is as 

open file _name access permission 

access is the access mode

r.... open the file for reading . The file must b present.
r+...open a file for reading and writing.
w.. open the file for writing. create the file if it is not present.
w+.. open file for reading and writing.. create if not present.
a.. open file for writing . it must be present their.
a+.. open file for writing and create it if not present their.

permission :

permission is an integer to use  to set the file access permissions

close fileID:

closes the file that has been already created.

gets fileID varnamee:

reads a line from fileID and discards the terminating newline.

puts ? -nonewline? fileID string

writes in file.

Examples:

i have a file abc.text in this location \hoome\masroor.

a:

set ns

open \home\masroor\abc  r 

returns file3 which is file id

now i will use this id to close file

close file3

b:

open /home/masroor/abc w+

puts file4 "i hate this "

close file4