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Full Discussion: $(< file ) and $( cat file )
Top Forums Shell Programming and Scripting $(< file ) and $( cat file ) Post 303012384 by ctsgnb on Saturday 3rd of February 2018 04:27:16 AM
Old 02-03-2018
Yeah, I agree with you regarding the UUOC one.
The test with -- was just bulk try just to see if it would get the -- as an end of options and see how it would handle the rest of the command line.

I ran it on an AIX machine which didn't return an error message, but a fooled output instead, with some strange control character (the kind of output that sometimes may mess up your PuTTY screen ...)

As Yoda and Scruti noticed, I think the confusing point was that, $(< /dev/urandom tr -dc '[:alnum:],@#:!?+-' | head -c10 )
is not interpreted as the special case $(<filename) but as the $( cmd )

This brings me to the question :
Does the special case $(<filename) support only and strictly 1 file ?
Last edited by ctsgnb; 02-03-2018 at 05:37 AM..
 

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LEARN ABOUT DEBIAN

plink

plink(1)							 PuTTY tool suite							  plink(1)

NAME

       plink - PuTTY link, command line network connection tool

SYNOPSIS

       plink [options] [user@]host [command]

DESCRIPTION

       plink is a network connection tool supporting several protocols.

OPTIONS

       The command-line options supported by plink are:

       -V     Show version information and exit.

       -pgpfp Display the fingerprints of the PuTTY PGP Master Keys and exit, to aid in verifying new files released by the PuTTY team.

       -v     Show verbose messages.

       -load session
	      Load settings from saved session.

       -ssh   Force use of SSH protocol (default).

       -telnet
	      Force use of Telnet protocol.

       -rlogin
	      Force use of rlogin protocol.

       -raw   Force raw mode.

       -serial
	      Force serial mode.

       -P port
	      Connect to port port.

       -l user
	      Set remote username to user.

       -m path
	      Read remote command(s) from local file path.

       -batch Disable interactive prompts.

       -pw password
	      Set  remote  password to password. CAUTION: this will likely make the password visible to other users of the local machine (via com-
	      mands such as `w').

       -L [srcaddr:]srcport:desthost:destport
	      Set up a local port forwarding: listen on srcport (or srcaddr:srcport if specified), and forward any connections over the  SSH  con-
	      nection to the destination address desthost:destport. Only works in SSH.

       -R [srcaddr:]srcport:desthost:destport
	      Set  up a remote port forwarding: ask the SSH server to listen on srcport (or srcaddr:srcport if specified), and to forward any con-
	      nections back over the SSH connection where the client will pass them on to the destination address desthost:destport. Only works in
	      SSH.

       -D [srcaddr:]srcport
	      Set  up  dynamic port forwarding. The client listens on srcport (or srcaddr:srcport if specified), and implements a SOCKS server. So
	      you can point SOCKS-aware applications at this port and they will automatically use the SSH connection to tunnel all  their  connec-
	      tions. Only works in SSH.

       -X     Enable X11 forwarding.

       -x     Disable X11 forwarding (default).

       -A     Enable agent forwarding.

       -a     Disable agent forwarding (default).

       -t     Enable pty allocation (default if a command is NOT specified).

       -T     Disable pty allocation (default if a command is specified).

       -1     Force use of SSH protocol version 1.

       -2     Force use of SSH protocol version 2.

       -C     Enable SSH compression.

       -i path
	      Private key file for authentication.

       -s     Remote command is SSH subsystem (SSH-2 only).

       -N     Don't start a remote command or shell at all (SSH-2 only).

       -sercfg configuration-string
	      Specify  the configuration parameters for the serial port, in -serial mode. configuration-string should be a comma-separated list of
	      configuration parameters as follows:

	      o      Any single digit from 5 to 9 sets the number of data bits.

	      o      `1', `1.5' or `2' sets the number of stop bits.

	      o      Any other numeric string is interpreted as a baud rate.

	      o      A single lower-case letter specifies the parity: `n' for none, `o' for odd, `e' for even, `m' for mark and `s' for space.

	      o      A single upper-case letter specifies the flow control: `N' for none, `X' for XON/XOFF, `R' for RTS/CTS and `D' for DSR/DTR.

MORE INFORMATION

       For more information on plink, it's probably best to go and look at the manual on the PuTTY web page:

       http://www.chiark.greenend.org.uk/~sgtatham/putty/

BUGS

       This man page isn't terribly complete. See the above web link for better documentation.

PuTTY tool suite						    2004-03-24								  plink(1)
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