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Full Discussion: can't execute a shell script
Top Forums UNIX for Dummies Questions & Answers can't execute a shell script Post 302501990 by homeboy on Sunday 6th of March 2011 10:21:56 AM
Old 03-06-2011
Quote:
Originally Posted by scottn
You logged in as someone who had no home directory, and despite not being able to create a file, you copied a file called "script" into that directory?

So you copied a file, something you are unable to do, to somewhere that didn't exist?

What error did you get (aside from the invalid . in the while loop - that you wouldn't see, as you couldn't execute the script!)? Which OS are you using?
sorry i make a fool mistake....In my script,the sleep time was set to be very long as a careless mistake.So i thought it wasn't executed....Smilie what a fool i am.....Anyway,thanks for your help

---------- Post updated at 10:21 AM ---------- Previous update was at 10:17 AM ----------

Quote:
Originally Posted by scottn
A : would mean "true". I tested a . in bash (not in Ubuntu) and it throws an error.

If your user was missing a home directory, you probably just forgot to specify it when running useradd.

You obviously resolved that using mkdir, chown and chmod.

I'm confused (it doesn't always take much to confuse me!), but where exactly is your problem, and what has nohup to do with it? (except that if you had run it nohup, the output would go to nohup.out by default)

You said you couldn't execute the script, but clearly you can if it's an infinite loop.

Try changing the . to a :. Otherwise perhaps you have an alias for date that's expecting some input (that would make the script seem "infinite")?
Thanks,all your words here are right except about ".".Now i realized the : means true,however,my code runs well when i still use "." as a test Smilie
 

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LEARN ABOUT DEBIAN

viewsu

VIEW-OS(1)						      General Commands Manual							VIEW-OS(1)

NAME

       viewsu - change (virtual) user ID or become (virtual) superuser

SYNOPSIS

       viewsu [options] [username]

DESCRIPTION

       The viewsu command is used to become another user during a login session. Invoked without a username, viewsu defaults to becoming the supe-
       ruser. The optional argument - may be used to provide an environment similar to what the user would expect had the user logged in directly.
       This  command  is  the  View-OS	counterpart  of  the  su(1)  command.	The  value of $PATH is reset to /bin:/usr/bin for normal users, or
       /sbin:/bin:/usr/sbin:/usr/bin for the superuser. This may be changed with the ENV_PATH and ENV_SUPATH definitions in /etc/login.defs.

OPTIONS

       The options which apply to the viewsu command are:

       -c, --command COMMAND
	   Specify a command that will be invoked by the shell using its -c.

       -, -l, --login
	   Provide an environment similar to what the user would expect had the user logged in directly.

	   When - is used, it must be specified as the last viewsu option. The other forms (-l and --login) do not have this restriction.

       -s, --shell SHELL
	   The shell that will be invoked.

	   The invoked shell is chosen from (highest priority first):

	   o   The shell specified with --shell.

	   o   The shell indicated in the /etc/passwd entry for the target user.

	   o	/bin/sh if a shell could not be found by any above method.

SEE ALSO

       su(1), linux.defs(5)

AUTHORS

       View-OS is a project of the Computer Science Department, University of Bologna. Project Leader: Renzo Davoli.
       <http://www.sourceforge.net/projects/view-os>

       Howto's and further information can be found on the project wiki <wiki.virtualsquare.org>.

NOTE

       Most part of the text is taken from su(1).

VIEW-OS: a process with a view					  August 5, 2009							VIEW-OS(1)
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