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Full Discussion: Difference in commands
Top Forums UNIX for Dummies Questions & Answers Difference in commands Post 302327732 by jim mcnamara on Monday 22nd of June 2009 12:28:10 PM
Old 06-22-2009
The ./ means execute a script or executable file in the current working directory. ./ls would only work if your current working directory were /usr/bin - ie.,
Code:
cd /somewhere
./ls

will generate an error unless there is an "ls" in the /somewhere directory

What you are seeing is the effect of the PATH variable as your sysadmin defined it - proabably in /etc/profile. It has nothing to with Korn shell per se. In other words, you PATH has a dot in it:
Code:
echo $PATH
.:/usr/bin/:/usr/sbin"

the .: thing means look in the current directory. It is a convenience, and a security risk as well. You could execute a file by mistake.
 

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nohup

NOHUP(1)                                                           User Commands                                                          NOHUP(1)

NAME

       nohup - run a command immune to hangups, with output to a non-tty

SYNOPSIS

       nohup COMMAND [ARG]...
       nohup OPTION

DESCRIPTION

       Run COMMAND, ignoring hangup signals.

       --help display this help and exit

       --version
              output version information and exit

       If  standard  input  is a terminal, redirect it from an unreadable file.  If standard output is a terminal, append output to 'nohup.out' if
       possible, '$HOME/nohup.out' otherwise.  If standard error is a terminal, redirect it to standard output.   To  save  output  to  FILE,  use
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       NOTE: your shell may have its own version of nohup, which usually supersedes the version described here.  Please refer to your shell's doc-
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AUTHOR

       Written by Jim Meyering.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report nohup translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
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SEE ALSO

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GNU coreutils 8.28                                                 January 2018                                                           NOHUP(1)
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