ISUP

Section: CSLib Utilities (1)
Updated: April 20, 2002
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NAME

isup - Find out if a machine is up by trying a TCP/IP connection  

SYNOPSIS

isup [ -p ] host [ port ]  

DESCRIPTION

isup tries to create a TCP/IP connection to host (optionally on port port, default is TCP 7, i.e. echo). If the machine is up (i.e. the connection is accepted, or refused), then zero (success) is returned. A non-zero error code is returned if the connection fails.
-p
Also print out an explanatory line of whether the machine is available or not, and if not, what the error was.
 

AUTHOR

isup was written by Alan Ford.  

SEE ALSO

connect(3)


 

Index

NAME
SYNOPSIS
DESCRIPTION
AUTHOR
SEE ALSO