nested read


 
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Old 03-05-2004
nested read

I am hoping someone can help me with this one.

I am writing a ksh script on Solaris. I want to read in host names and some other info from a file, do an "rsh host 'shutdown'" (or any uname for now until I get it working), and then be given some options. The problem is I am using while read LINE do with a nested read like this:


Code:
cat hosts.lst | while read LINE
do
   set ${LINE}
   rsh ${1} 'uname -a'
   DONE=false
   while [[ ${DONE} = false ]]
   do
      echo "[C]heck, [K]ill, [G]o?"
      read ANSWER
      ANSWER=`echo ${ANSWER} | tr -s '[:lower:]' '[:upper:]'`
      echo "ANSWER is ${ANSWER}"
      case ${ANSWER} in
         C ) check_running_processes;;
         K ) kill_running_processes;;
         G ) DONE=true;; #go to next priority
       esac
   done

This isn't the entire script just the section I am having problems with. The problem I cannot get around is when I try to "read ANSWER", $ANSWER is getting the value of $LINE for that iteration. I understand why this is happening but cannot figure out how to get around it.

I have tried putting the read in (), in a separate subroutine, unsetting $LINE, setting $LINE to something else.

Any other ideas?

Thanks,
Tony
 
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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)