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Full Discussion: Test if script was ran w/ nohup
Top Forums UNIX for Dummies Questions & Answers Test if script was ran w/ nohup Post 302729663 by Don Cragun on Saturday 10th of November 2012 07:56:50 PM
Old 11-10-2012
Inside a shell script it is hard to determine if it was started by the nohup utility. However, if STDOUT or STDERR for your script is a TTY device, you will know that it was not started by nohup. If being immune to SIGHUP signals and not having STDOUT directed to a TTY device and not having STDERR directed to a TTY device is sufficient for your script to continue running, the following code may help:
Code:
#!/bin/ksh
trap '' HUP
if [ "x$(tty <&1)" != "xnot a tty" ] || [ "x$(tty <&2)" != "xnot a tty" ]
then    printf '%s: This script must be started by "nohup %s ..."\n' "$0" "$0"
        exit 1
fi
printf '%s SIGHUP ignored and STDIN & STDERR directed to non-TTYs\n' "$0"
. . . other shell commands . . .

This was written and tested with the Korn shell, but should work with bash, ksh, or sh with no changes. It won't work with csh or similar shells.
 

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LEARN ABOUT OSX

nohup

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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