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rsh and timeout

 
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Old 01-06-2010
rsh and timeout
hi,

i have many ksh shell scripts running "rsh" command and sometimes the remote host doesn't answer so the rsh command doesn't return data and the script waits.

How can i modify this to have a forced return to continue my script , a kind of controlled timeout ?

thanks in advance
Christian

---------- Post updated at 05:37 PM ---------- Previous update was at 05:01 PM ----------

hi ,

i've found "-t" flag :

# rsh app506a -t 5 "date"
rsh: timed out waiting for connection.

it seems to work ok
the remote host is AIX 5.3.0

is somebody have informations about the relationship between AIX version and this rsh flag ?

regards
Christian
 
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LEARN ABOUT BSD

rsh

RSH(1C) 																   RSH(1C)

NAME

       rsh - remote shell

SYNOPSIS

       rsh host [ -l username ] [ -n ] command
       host [ -l username ] [ -n ] command

DESCRIPTION

       Rsh  connects to the specified host, and executes the specified command.  Rsh copies its standard input to the remote command, the standard
       output of the remote command to its standard output, and the standard error of the remote command to its standard error.   Interrupt,  quit
       and terminate signals are propagated to the remote command; rsh normally terminates when the remote command does.

       The  remote  username  used is the same as your local username, unless you specify a different remote name with the -l option.  This remote
       name must be equivalent (in the sense of rlogin(1C)) to the originating account; no provision is made for specifying a password with a com-
       mand.

       If you omit command, then instead of executing a single command, you will be logged in on the remote host using rlogin(1C).

       Shell  metacharacters  which  are  not  quoted  are interpreted on local machine, while quoted metacharacters are interpreted on the remote
       machine.  Thus the command

	  rsh otherhost cat remotefile >> localfile

       appends the remote file remotefile to the localfile localfile, while

	  rsh otherhost cat remotefile ">>" otherremotefile

       appends remotefile to otherremotefile.

       Host names are given in the file /etc/hosts.  Each host has one standard name (the first name given in the file), which is rather long  and
       unambiguous, and optionally one or more nicknames.  The host names for local machines are also commands in the directory /usr/hosts; if you
       put this directory in your search path then the rsh can be omitted.

FILES

       /etc/hosts
       /usr/hosts/*

SEE ALSO

       rlogin(1C)

BUGS

       If you are using csh(1) and put a rsh(1C) in the background without redirecting its input away from the terminal, it will block even if	no
       reads are posted by the remote command.	If no input is desired you should redirect the input of rsh to /dev/null using the -n option.

       You cannot run an interactive command (like rogue(6) or vi(1)); use rlogin(1C).

       Stop  signals  stop  the  local	rsh process only; this is arguably wrong, but currently hard to fix for reasons too complicated to explain
       here.

4.2 Berkeley Distribution					  April 29, 1985							   RSH(1C)