inbuilt nohup logic into the script Post: 302404252

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Top Forums Shell Programming and Scripting inbuilt nohup logic into the script Post 302404252 by clx on Tuesday 16th of March 2010 05:06:44 AM

03-16-2010

Registered User

Quote:

Originally Posted by pludi

This might do what you want:

Code:

mynohup(){
# Close stdin, and make any read attempt an error
    if [ -t 0 ]
    then
        exec 0>/dev/null
    fi

# Redirect stdout to a file if it's a TTY
    if [ -t 1 ]
    then
        exec 1>nohup.out
        if [ $? -ne 0 ]
        then
            exec 1>$HOME/nohup.out
        fi
    fi

# Redirect stderr to stdout if it's a TTY
    if [ -t 2 ]
    then
        exec 2>&1
    fi

# Trap the HUP signal to ignore it
    trap : HUP
}

Save it in a file, source that in any script you want to ignore SIGHUP in, call the mynohup function (or whatever you want to call it) once, and you're good to go. Tested with ksh and bash, and modeled after the nohup shipped with the GNU coreutils.

I found this thing very useful. Thanks for the info.
just one query, is there any side effects if someone executes the script explicitly with nohup having this logic inside the script.

clx

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LEARN ABOUT XFREE86

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
       'nohup COMMAND > FILE'.

       NOTE: your shell may have its own version of nohup, which usually supersedes the version described here.  Please refer to your shell's doc-
       umentation for details about the options it supports.

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>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/nohup>
       or available locally via: info '(coreutils) nohup invocation'

GNU coreutils 8.28                                                 January 2018                                                           NOHUP(1)