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Full Discussion: Getting one script to run on multiple boxes
Top Forums UNIX for Dummies Questions & Answers Getting one script to run on multiple boxes Post 102449 by bschnair on Friday 17th of March 2006 10:13:44 PM
Old 03-17-2006
thestevew,

I created a ksh script that contains the 'while read' loop you described above, and added "echo $host" lines just inside the 'do' and 'done'. I also created a 'listofhostsfile' containing the names of 6 remote boxes.

If I comment out the rcp and rsh commands, the script simply echoes the name of each remote box twice, just as expected. When I uncomment the rcp and rsh lines, the loop only executes for the first remote box. Both 'echo' lines execute. For some reason, the 'while' loop thinks it is finished after the first pass through the rsh/rcp commands.

The same behavior occurs if I 'cat' the hostfile and pipe it into the 'while' loop.
If I do not use the hostfile, but hard-code the box names into a 'for' loop (Ice's script), things work fine.

Any ideas why this would happen? I have verified that the variable 'host' is not used in the script called by rsh. (I'm actually using a variable called 'whost'.) Not sure if this is relevent, but this "wrapper" script is ksh and the script executed by the rsh is "borrowed and modified" csh code that sources its local environment (ie: source /usr/blah/.cshrc).

I appreciate your help!
Last edited by bschnair; 03-18-2006 at 05:26 AM..
 

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LEARN ABOUT FREEBSD

rcp

RCP(1)							    BSD General Commands Manual 						    RCP(1)

NAME

     rcp -- remote file copy

SYNOPSIS

     rcp [-46p] file1 file2
     rcp [-46pr] file ... directory

DESCRIPTION

     The rcp utility copies files between machines.  Each file or directory argument is either a remote file name of the form
     ``ruser@rhost:path'', or a local file name (containing no ':' characters, or a '/' before any ':'s).

     The following options are available:

     -4      Use IPv4 addresses only.

     -6      Use IPv6 addresses only.

     -p      Cause rcp to attempt to preserve (duplicate) in its copies the modification times and modes of the source files, ignoring the
	     umask(2).	By default, the mode and owner of file2 are preserved if it already existed; otherwise the mode of the source file modi-
	     fied by the umask(2) on the destination host is used.

     -r      If any of the source files are directories, rcp copies each subtree rooted at that name; in this case the destination must be a
	     directory.

     If path is not a full path name, it is interpreted relative to the login directory of the specified user ruser on rhost, or your current user
     name if no other remote user name is specified.  A path on a remote host may be quoted (using '', '"', or ''') so that the metacharacters
     are interpreted remotely.

     The rcp utility does not prompt for passwords; it performs remote execution via rsh(1), and requires the same authorization.

     The rcp utility handles third party copies, where neither source nor target files are on the current machine.

SEE ALSO

     cp(1), ftp(1), rlogin(1), rsh(1), hosts.equiv(5)

HISTORY

     The rcp command appeared in 4.2BSD.  The version of rcp described here has been reimplemented with Kerberos in 4.3BSD-Reno.

BUGS

     Does not detect all cases where the target of a copy might be a file in cases where only a directory should be legal.

     Is confused by any output generated by commands in a .login, .profile, or .cshrc file on the remote host.

     The destination user and hostname may have to be specified as ``rhost.ruser'' when the destination machine is running the 4.2BSD version of
     rcp.

BSD
								 October 16, 2002							       BSD
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