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Full Discussion: Difference in commands
Top Forums UNIX for Dummies Questions & Answers Difference in commands Post 302327829 by Scott on Monday 22nd of June 2009 04:22:14 PM
Old 06-22-2009
./ means something in the current directory

nohup means don't "hang up" (i.e don't kill this when I leave) and it's not tied to any process (i.e. if you run nohup from the command line or a shell program and either of them die, or are killed or exited, the process will become owned by init... that which starts all processes. If init (process #1) dies then everything dies with it. So if you start something with nohup ... &, it will run in the background and continue to run after you log out.

& means run it in the background

As jim says the distinction between ./command and command is very important. Most sys admins won't have . in their path for the reasons he states.

Last edited by Scott; 06-22-2009 at 05:28 PM..
 

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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. EXIT STATUS
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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