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from http://www.gnu.org/software/coreutils/manual/html_node/nohup-invocation.html

nohup runs the given command with hangup signals ignored, so that the command can continue running in the background after you log out.

Synopsis: nohup command [arg]...

If standard input is a terminal, redirect it so that terminal sessions do not mistakenly consider the terminal to be used by the command.

1. Why do we need to do this:

   Make the substitute file descriptor unreadable, so that commands that mistakenly attempt to read from standard input can report an error.

2. Isn't redirection stdin from a file done by nohup command [arg]... 0<myfile? why 0>/dev/null?

   This redirection is a GNU extension; programs intended to be portable to non-GNU hosts can use nohup command [arg]... 0>/dev/null instead.

from http://www.gnu.org/software/coreutils/manual/html_node/nohup-invocation.html

nohup runs the given command with hangup signals ignored, so that the command can continue running in the background after you log out.

Synopsis: nohup command [arg]...

If standard input is a terminal, redirect it so that terminal sessions do not mistakenly consider the terminal to be used by the command.

1. Why do we need to do this:

   Make the substitute file descriptor unreadable, so that commands that mistakenly attempt to read from standard input can report an error.

2. Isn't redirection stdin from a file done by nohup command [arg]... 0<myfile? why 0>/dev/null?

   This redirection is a GNU extension; programs intended to be portable to non-GNU hosts can use nohup command [arg]... 0>/dev/null instead.

from http://www.gnu.org/software/coreutils/manual/html_node/nohup-invocation.html

nohup runs the given command with hangup signals ignored, so that the command can continue running in the background after you log out.

Synopsis: nohup command [arg]...

If standard input is a terminal, redirect it so that terminal sessions do not mistakenly consider the terminal to be used by the command.

Why do we need to do this:

Make the substitute file descriptor unreadable, so that commands that mistakenly attempt to read from standard input can report an error.

Isn't redirection stdin to a file by nohup command [arg]... 0<myfile? why 0>/dev/null?

This redirection is a GNU extension; programs intended to be portable to non-GNU hosts can use nohup command [arg]... 0>/dev/null instead.

from http://www.gnu.org/software/coreutils/manual/html_node/nohup-invocation.html

nohup runs the given command with hangup signals ignored, so that the command can continue running in the background after you log out.

Synopsis: nohup command [arg]...

If standard input is a terminal, redirect it so that terminal sessions do not mistakenly consider the terminal to be used by the command.

1. Why do we need to do this:

   Make the substitute file descriptor unreadable, so that commands that mistakenly attempt to read from standard input can report an error.

2. Isn't redirection stdin from a file done by nohup command [arg]... 0<myfile? why 0>/dev/null?

   This redirection is a GNU extension; programs intended to be portable to non-GNU hosts can use nohup command [arg]... 0>/dev/null instead.

from http://www.gnu.org/software/coreutils/manual/html_node/nohup-invocation.html

nohup runs the given command with hangup signals ignored, so that the command can continue running in the background after you log out.

Synopsis: nohup command [arg]...

If standard input is a terminal, redirect it so that terminal sessions do not mistakenly consider the terminal to be used by the command.

Why do we need to do this:

Make the substitute file descriptor unreadable, so that commands that mistakenly attempt to read from standard input can report an error.

Isn't redirection stdin to a file by nohup command [arg]... 0<myfile? why 0>/dev/null?

This redirection is a GNU extension; programs intended to be portable to non-GNU hosts can use ‘nohup command [arg]... 0>/dev/null’ instead.

from http://www.gnu.org/software/coreutils/manual/html_node/nohup-invocation.html

nohup runs the given command with hangup signals ignored, so that the command can continue running in the background after you log out.

Synopsis: nohup command [arg]...

If standard input is a terminal, redirect it so that terminal sessions do not mistakenly consider the terminal to be used by the command.

Why do we need to do this:

Make the substitute file descriptor unreadable, so that commands that mistakenly attempt to read from standard input can report an error.

Isn't redirection stdin to a file by nohup command [arg]... 0<myfile? why 0>/dev/null?

This redirection is a GNU extension; programs intended to be portable to non-GNU hosts can use nohup command [arg]... 0>/dev/null instead.