how can i check in csh if command found or not found ?

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LEARN ABOUT BSD

bel

BEL(1)                                                                                                                                      BEL(1)

NAME

       bel - open a shell or execute a command on a remote computer through several machines

SYNOPSIS

       bel [-e file] [-s file] [-d delay]

DESCRIPTION

       bel generates a script allowing the user to open a shell or execute a command on a remote computer through several machines. In order to
       generate the script, the user gives the paths to the different machines until the final one is reached. Several paths may be specified in a
       single entry file or through the standard input.

OPTIONS

       -e, --entree=FILE
           Provide the necessary information to establish the tunnel between the source and the final computer.

       -s, --repertoire-sortie=DIRECTORY
           The directory where you want to put the generated scripts.

       -d, --delai=SECONDS
           Delay to wait before each sent command, in seconds.

AUTHOR

       Carl Chenet <chaica@ohmytux.com[]>

RESSOURCES

       Belier homepage : http://www.ohmytux.com/belier

LICENSE

       Copyright (C) <2009> <Carl Chenet>This program is free software: you can redistribute it and/or modify it under the terms of the GNU
       General Public License as published by the Free Software Foundation, either version 3 of the License or any later version. This program is
       distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
       FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public
       License along with this program. If not, see <http://www.gnu.org/licenses/>.

                                                                    05/16/2009                                                              BEL(1)

Shell Programming and Scripting