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authorIndrajith K L2022-12-03 17:00:20 +0530
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+nohup(P) nohup(P)
+
+
+
+
+
+NAME
+ nohup - invoke a utility immune to hangups
+
+SYNOPSIS
+ nohup utility [argument...]
+
+DESCRIPTION
+ The nohup utility shall invoke the utility named by the
+ utility operand with arguments supplied as the argument
+ operands. At the time the named utility is invoked, the
+ SIGHUP signal shall be set to be ignored.
+
+ If the standard output is a terminal, all output written
+ by the named utility to its standard output shall be
+ appended to the end of the file nohup.out in the current
+ directory. If nohup.out cannot be created or opened for
+ appending, the output shall be appended to the end of
+ the file nohup.out in the directory specified by the
+ HOME environment variable. If neither file can be cre-
+ ated or opened for appending, utility shall not be
+ invoked. If a file is created, the file's permission
+ bits shall be set to S_IRUSR | S_IWUSR.
+
+ If the standard error is a terminal, all output written
+ by the named utility to its standard error shall be
+ redirected to the same file descriptor as the standard
+ output.
+
+OPTIONS
+ None.
+
+OPERANDS
+ The following operands shall be supported:
+
+ utility
+ The name of a utility that is to be invoked. If
+ the utility operand names any of the special
+ built-in utilities in Special Built-In Utilities
+ , the results are undefined.
+
+ argument
+ Any string to be supplied as an argument when
+ invoking the utility named by the utility oper-
+ and.
+
+
+STDIN
+ Not used.
+
+INPUT FILES
+ None.
+
+ENVIRONMENT VARIABLES
+ The following environment variables shall affect the
+ execution of nohup:
+
+ HOME Determine the pathname of the user's home direc-
+ tory: if the output file nohup.out cannot be cre-
+ ated in the current directory, the nohup utility
+ shall use the directory named by HOME to create
+ the file.
+
+ LANG Provide a default value for the internationaliza-
+ tion variables that are unset or null. (See the
+ Base Definitions volume of IEEE Std 1003.1-2001,
+ Section 8.2, Internationalization Variables for
+ the precedence of internationalization variables
+ used to determine the values of locale cate-
+ gories.)
+
+ LC_ALL If set to a non-empty string value, override the
+ values of all the other internationalization
+ variables.
+
+ LC_CTYPE
+ Determine the locale for the interpretation of
+ sequences of bytes of text data as characters
+ (for example, single-byte as opposed to multi-
+ byte characters in arguments).
+
+ LC_MESSAGES
+ Determine the locale that should be used to
+ affect the format and contents of diagnostic mes-
+ sages written to standard error.
+
+ NLSPATH
+ Determine the location of message catalogs for
+ the processing of LC_MESSAGES .
+
+ PATH Determine the search path that is used to locate
+ the utility to be invoked. See the Base Defini-
+ tions volume of IEEE Std 1003.1-2001, Chapter 8,
+ Environment Variables.
+
+
+ASYNCHRONOUS EVENTS
+ The nohup utility shall take the standard action for all
+ signals except that SIGHUP shall be ignored.
+
+STDOUT
+ If the standard output is not a terminal, the standard
+ output of nohup shall be the standard output generated
+ by the execution of the utility specified by the oper-
+ ands. Otherwise, nothing shall be written to the stan-
+ dard output.
+
+STDERR
+ If the standard output is a terminal, a message shall be
+ written to the standard error, indicating the name of
+ the file to which the output is being appended. The name
+ of the file shall be either nohup.out or
+ $HOME/nohup.out.
+
+OUTPUT FILES
+ If the standard output is a terminal, all output written
+ by the named utility to the standard output and standard
+ error is appended to the file nohup.out, which is cre-
+ ated if it does not already exist.
+
+EXTENDED DESCRIPTION
+ None.
+
+EXIT STATUS
+ The following exit values shall be returned:
+
+ 126 The utility specified by utility was found but
+ could not be invoked.
+
+ 127 An error occurred in the nohup utility or the
+ utility specified by utility could not be found.
+
+
+ Otherwise, the exit status of nohup shall be that of the
+ utility specified by the utility operand.
+
+CONSEQUENCES OF ERRORS
+ Default.
+
+ The following sections are informative.
+
+APPLICATION USAGE
+ The command, env, nice, nohup, time, and xargs utilities
+ have been specified to use exit code 127 if an error
+ occurs so that applications can distinguish "failure to
+ find a utility" from "invoked utility exited with an
+ error indication". The value 127 was chosen because it
+ is not commonly used for other meanings; most utilities
+ use small values for "normal error conditions" and the
+ values above 128 can be confused with termination due to
+ receipt of a signal. The value 126 was chosen in a simi-
+ lar manner to indicate that the utility could be found,
+ but not invoked. Some scripts produce meaningful error
+ messages differentiating the 126 and 127 cases. The dis-
+ tinction between exit codes 126 and 127 is based on
+ KornShell practice that uses 127 when all attempts to
+ exec the utility fail with [ENOENT], and uses 126 when
+ any attempt to exec the utility fails for any other rea-
+ son.
+
+EXAMPLES
+ It is frequently desirable to apply nohup to pipelines
+ or lists of commands. This can be done by placing pipe-
+ lines and command lists in a single file; this file can
+ then be invoked as a utility, and the nohup applies to
+ everything in the file.
+
+ Alternatively, the following command can be used to
+ apply nohup to a complex command:
+
+
+ nohup sh -c 'complex-command-line'
+
+RATIONALE
+ The 4.3 BSD version ignores SIGTERM and SIGHUP, and if
+ ./nohup.out cannot be used, it fails instead of trying
+ to use $HOME/nohup.out.
+
+ The csh utility has a built-in version of nohup that
+ acts differently from the nohup defined in this volume
+ of IEEE Std 1003.1-2001.
+
+ The term utility is used, rather than command, to high-
+ light the fact that shell compound commands, pipelines,
+ special built-ins, and so on, cannot be used directly.
+ However, utility includes user application programs and
+ shell scripts, not just the standard utilities.
+
+ Historical versions of the nohup utility use default
+ file creation semantics. Some more recent versions use
+ the permissions specified here as an added security pre-
+ caution.
+
+ Some historical implementations ignore SIGQUIT in addi-
+ tion to SIGHUP; others ignore SIGTERM. An early proposal
+ allowed, but did not require, SIGQUIT to be ignored.
+ Several reviewers objected that nohup should only modify
+ the handling of SIGHUP as required by this volume of
+ IEEE Std 1003.1-2001.
+
+FUTURE DIRECTIONS
+ None.
+
+SEE ALSO
+ Shell Command Language , sh , the System Interfaces
+ volume of IEEE Std 1003.1-2001, signal()
+
+COPYRIGHT
+ Portions of this text are reprinted and reproduced in
+ electronic form from IEEE Std 1003.1, 2003 Edition,
+ Standard for Information Technology -- Portable Operat-
+ ing System Interface (POSIX), The Open Group Base Speci-
+ fications Issue 6, Copyright (C) 2001-2003 by the Insti-
+ tute of Electrical and Electronics Engineers, Inc and
+ The Open Group. In the event of any discrepancy between
+ this version and the original IEEE and The Open Group
+ Standard, the original IEEE and The Open Group Standard
+ is the referee document. The original Standard can be
+ obtained online at http://www.open-
+ group.org/unix/online.html .
+
+
+
+POSIX 2003 nohup(P)