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Full Discussion: Reading CLI input for script
Top Forums Shell Programming and Scripting Reading CLI input for script Post 302580199 by mirni on Wednesday 7th of December 2011 11:34:02 PM
Old 12-08-2011
You can check the roots privileges by testing EUID. If EUID==0, then the caller has roots powers.

Check if the account exists: look at /etc/passwd. You can see all users there. /etc/groups stores the groups.

Lock/unlock: create a lock file and test for its existence. You can then even gather other interesting info, like when the user invoked your script (timestamp of lockfile).
 

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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)
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