:-(

[terminalfrost]

plz explain me wht is a file descriptor.wht actually its functionality is??

 

[Annihilannic]

A file descriptor is a place holder for an open file and is usually identified by a positive integer. When a process is created it gets three file descriptors by default: 0 (standard input), 1 (standard output) and 2 (standard error).

Any additional files you open will be given file descriptors of 3 and higher.

Annihilannic.

 

[tikual]

For example,
#!/bin/ksh
date > status
df -k >> status

exec 3< status #status redirect to fd3
exec 4> time #fd4 redirect to time

read -u3 line #assign fd3 to variable $line
print -u4 $line #print $line to fd4

#Try to know this by yourself