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Full Discussion: can a nohup'ed ksh script interact with user
Top Forums Shell Programming and Scripting can a nohup'ed ksh script interact with user Post 302648807 by Corona688 on Wednesday 30th of May 2012 11:09:40 AM
Old 05-30-2012
Quote:
Originally Posted by twk
Very kewl, did not know about "disown". Regrettably the version of ksh on this server (Solaris 10) does not support disown.
If it doesn't support it, you don't even need it, so just remove it.

Quote:
Why did you use "</dev/null", I know what it is but not why you used it.
Because that's exactly what nohup does. Things that try to read from /dev/null will instantly get 'end of file', which is better than an error like 'invalid file descriptor' that you'd get from actually closing the file. See man nohup.

Quote:
Code:
#!/usr/bin/env ksh
 
interact with user

echo "script  will now run independently in background"
 
nohup -p $$
 
( 
  so something
  ...
)&
 
exit 0

I don't know what -p does, my system doesn't have it. But the nohup is entirely redundant here. Your script also doesn't work like it should since you're not doing redirections on the part inside the subshell anymore. If you just did redirections the way I did in the first place instead of ripping them out...

Code:
#!/usr/bin/env ksh
 
interact with user

echo "script  will now run independently in background"
 
( 
  so something
  ...
) >>nohup.log 2>&1 </dev/null &
 
exit 0

 

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LEARN ABOUT OPENDARWIN

nohup

NOHUP(1)						    BSD General Commands Manual 						  NOHUP(1)

NAME

     nohup -- invoke a utility immune to hangups

SYNOPSIS

     nohup [--] utility [arguments]

DESCRIPTION

     The nohup utility invokes utility with its arguments and at this time sets the signal SIGHUP to be ignored.  If the standard output is a ter-
     minal, the standard output is appended to the file nohup.out in the current directory.  If standard error is a terminal, it is directed to
     the same place as the standard output.

     Some shells may provide a builtin nohup command which is similar or identical to this utility.  Consult the builtin(1) manual page.

ENVIRONMENT

     The following variables are utilized by nohup:

     HOME  If the output file nohup.out cannot be created in the current directory, the nohup utility uses the directory named by HOME to create
	   the file.

     PATH  Used to locate the requested utility if the name contains no '/' characters.

DIAGNOSTICS

     The nohup utility exits with one of the following values:

     126     The utility was found, but could not be invoked.

     127     The utility could not be found or an error occurred in nohup.

     Otherwise, the exit status of nohup will be that of utility.

SEE ALSO

     builtin(1), csh(1), signal(3)

STANDARDS

     The nohup utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BUGS

     Two or more instances of nohup can append to the same file, which makes for a confusing output.

BSD
								   July 19, 2001							       BSD
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