argv0 - runs a program with a specified 0th argument.
argv0 realname zero args
realname is one argument.
zero is one argument.
args is any
number of arguments.
argv0 runs the program stored as
realname on disk, with
zero as the 0th argument (rather than
realname) and
args
as the remaining arguments.
Some programs pay special attention to the 0th argument.
argv0 makes
these programs usable from shell scripts.
For example,
- argv0 /bin/csh -csh
runs /bin/csh with a 0th argument of -csh. /bin/csh will think it is a login
shell and behave accordingly.
As another example, the command
- tcpserver 0 ftp argv0 tcpd ftpd -l -A
has a similar effect to the line
- ftp stream tcp nowait root tcpd ftpd -l -A
in /etc/inetd.conf. The tcpd program is run with 0th argument ftpd and remaining
arguments -l -A. Note that tcpd can and should be replaced by the
-x
option of
tcpserver(1):
- tcpserver -x ftp.tcp 0 ftp ftpd -l -A
tcpserver(1),
tcprules(1),
tcprulescheck(1),
fixcrio(1),
recordio(1),
rblsmtpd(1),
tcpclient(1), who@(1), date@(1), finger@(1), http@(1),
tcpcat(1),
mconnect(1),
tcp-environ(5)
http://cr.yp.to/ucspi-tcp.html