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Shell Programming and Scripting
Detect if script starts from queue
Post 302684401 by Corona688 on Thursday 9th of August 2012 02:14:24 PM
08-09-2012
Exactly what I said.
If they run it like ./script < /dev/null then FD0 will not be a terminal, and your check will be bypassed.
To prevent that kind of trickery, go direct to the source. If you can open /dev/tty, you have an interactive terminal. If you can't, you don't.
Unfortunately every failure will cause an error message unless you redirect stderr temporarily.
If they run it like ./script < /dev/null then FD0 will not be a terminal, and your check will be bypassed.
To prevent that kind of trickery, go direct to the source. If you can open /dev/tty, you have an interactive terminal. If you can't, you don't.
Unfortunately every failure will cause an error message unless you redirect stderr temporarily.
Last edited by Corona688; 08-09-2012 at 03:25 PM..
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service
service(8) System Manager's Manual service(8) NAME
service - run a System V init script SYNOPSIS
service SCRIPT COMMAND [OPTIONS] service --status-all service --help | -h | --version DESCRIPTION
service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working directory set to /. The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT. The supported values of COMMAND depend on the invoked script, service passes COMMAND and OPTIONS it to the init script unmodified. All scripts should support at least the start and stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start command. service --status-all runs all init scripts, in alphabetical order, with the status command. If the init script file does not exist, the script tries to use legacy actions. If there is no suitable legacy action found and COMMAND is one of actions specified in LSB Core Specification, input is redirected to the systemctl. Otherwise the command fails with return code 2. FILES
/etc/init.d The directory containing System V init scripts. ENVIRONMENT
LANG, TERM The only environment variables passed to the init scripts. SEE ALSO
chkconfig(8), ntsysv(8), systemd(1), systemctl(8), systemd.service(5) Jan 2006 service(8)