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Top Forums Shell Programming and Scripting question Post 302072711 by RTM on Friday 5th of May 2006 10:32:11 AM

05-05-2006

Registered User

As much as I like your answer Deepsoul...

It's simple - to do a script you have a choice of shells or languages - choose one that you are use to using (such as the shell you use normally - do a
echo $SHELL to find out what you are using).

Once you have that, cd to your home directory - vi a new file (such as my-new-script)
$ cd
$ vi my-new-script
Insert the commands in the same order you would run them normally from the command line - only difference - add #!/bin/sh or whatever shell you are using at the top - this lets the system know what you are running these commands under

#!/bin/sh
/bin/cp /dirA/* /dirB/*
exit

Then use chmod as suggested to change the script to executable
A script is putting all the commands you usually have to do into a file to run - it's doing what you would do automatically (via cron if needed). The only thing a script does it make it so you don't have to type those commands every time.

Try this on your system:
$ cd
$ vi hbo
i
#!/bin/sh
date +'%n %D %A %T%n'
exit

Hit the escape key, put in a wq to write-quit from the vi editor
$ chmod 744 hbo
$ ./hbo

01/18/05 Tuesday 19:44:04

$

That's all there is to it -

RTM

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LEARN ABOUT PLAN9

setuid

SETUID(1)						      General Commands Manual							 SETUID(1)

NAME

       setuid - run a command with a different uid.

SYNOPSIS

       setuid username|uid   command [ args ]

DESCRIPTION

       Setuid  changes	user id, then executes the specified command.  Unlike some versions of su(1), this program doesn't ever ask for a password
       when executed with effective uid=root.  This program doesn't change the environment; it only changes the uid and then uses execvp() to find
       the command in the path, and execute it.  (If the command is a script, execvp() passes the command name to /bin/sh for processing.)

       For example,
	      setuid  some_user  $SHELL
       can be used to start a shell running as another user.

       Setuid  is  useful  inside  scripts that are being run by a setuid-root user -- such as a script invoked with super, so that the script can
       execute some commands using the uid of the original user, instead of root.  This allows unsafe commands (such as editors and pagers) to	be
       used  in  a  non-root  mode inside a super script.  For example, an operator with permission to modify a certain protected_file could use a
       super command that simply does:
	      cp protected_file temp_file
	      setuid $ORIG_USER ${EDITOR:-/bin/vi} temp_file
	      cp temp_file protected_file
       (Note: don't use this example directly.	If the temp_file can somehow be replaced by another user, as might be the case if it's kept  in  a
       temporary  directory,  there  will  be a race condition in the time between editing the temporary file and copying it back to the protected
       file.)

AUTHOR

       Will Deich

								       local								 SETUID(1)