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Full Discussion: Automated FTP task
Special Forums IP Networking Automated FTP task Post 6099 by Perderabo on Wednesday 29th of August 2001 04:02:01 PM
Old 08-29-2001
Quote:
Originally posted by ober5861


Perderabo... can you explain what that does exactly?

That is the file descriptor manipulation. Recall that fd 0 is standard-in, fd 1 is standard-out, and fd 2 is standard-error. The line "exec 4&>1" opens fd 4 and assigns it to whatever fd 1 was assigned to. As you will see, I am sorta "saving a copy of fd 1 in fd 4".

The line "ftp -nv >&4 2>&1 |&" is a little harder.

The "|&" turns the process into a co-process that allows subsequent "print -p" statements to send lines to the co-process' standard-in and "read -p" to read from its standard-out. So ksh forks a copy of itself and fiddles with the fd's 0 and 1 until this it set-up. But it leaves the rest of the fd's alone.

Then it encounters ">&4" which causes it to set the ftp process' standard out to whatever 4 is. Well since 4 is a copy of 1 before the co-process, we are back to writing to the original shell's standard out. Lastly, the 2>&4 does the same thing for standard error. I could've used "2>&1" at this point for the same effect.

This is hard to explain, but I hope this helps.

 

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print(1)							   User Commands							  print(1)

NAME
print - shell built-in function to output characters to the screen or window SYNOPSIS
ksh print [ -Rnprsu [n]] [arg...] DESCRIPTION
ksh The shell output mechanism. With no flags or with flag - or -, the arguments are printed on standard output as described by echo(1). OPTIONS
The following options are supported: -n suppresses new-line from being added to the output. -R -r (raw mode) ignore the escape conventions of echo. The -R option will print all subsequent arguments and options other than -n. -p causes the arguments to be written onto the pipe of the process spawned with |& instead of standard output. -s causes the arguments to be written onto the history file instead of standard output. -u [ n ] flag can be used to specify a one digit file descriptor unit number n on which the output will be placed. The default is 1. EXIT STATUS
The following exit values are returned: 0 Successful operation. >0 Output file is not open for writing. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
echo(1), ksh(1), attributes(5) SunOS 5.10 15 Apr 1994 print(1)
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