Why Do You Need the Explicit Pathname to Execute? Post: 302738119

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Top Forums UNIX for Dummies Questions & Answers Why Do You Need the Explicit Pathname to Execute? Post 302738119 by Corona688 on Friday 30th of November 2012 11:21:31 AM

11-30-2012

Registered User

Quote:

Originally Posted by sudon't

Yes, this is what I was wondering about - the reason it's done this way, is simply that it forces you to realize what you are doing?

That's a reason, but not the reason. The entire system uses PATH, not just you. This restriction gets rid of many unpredictable, unintended consequences.

The number of problems this could cause are potentially unlimited. It's not one specific problem, but a whole class of them. Imagine running commandname from your crontab, carelessly creating another file named commandname in your home directory to document what you've done, and seeing your cron log fill up with 'permission denied' for no reason you can explain -- because cron's trying to run your text document instead of /bin/commandname.

Having defined places where commands belong solves quite a lot.

P.S. It's not really the same issue as creating a new file. When you think about it, creating files is actually a lot more strict. It creates files in the current directory and only the current directory unless you force anything else. You wouldn't want 'nano bash' to open /bin/bash, after all. So running files, and creating files, are entirely separate things.

Last edited by Corona688; 11-30-2012 at 12:30 PM..

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cron

cron(8) 						      System Manager's Manual							   cron(8)

NAME

       cron - The system clock daemon

SYNOPSIS

       /usr/sbin/cron

DESCRIPTION

       The cron daemon runs shell commands at specified dates and times.  Commands that are to run according to a regular or periodic schedule are
       found within the crontab files.	Commands that are to run once only are found within the at files.  You submit crontab and at file  entries
       by  using  the  crontab	and  at  commands.  Because the cron process exits only when killed or when the system stops, only one cron daemon
       should exist on the system at any given time.  Normally, you start the cron daemon from within a run command file.

       During process initialization and when cron detects a change, it examines the crontab and at files.  This strategy reduces the overhead	of
       checking  for  new  or  changed files at regularly scheduled intervals.	The cron command creates a log of its activities.  The cron daemon
       must be started from the system startup scripts because it must begin execution without a login user ID set.  The cron daemon  starts  each
       job  with the following process attributes stored with the job by the invoking process: Login user ID Effective and real user IDs Effective
       and real group IDs Supplementary groups

       It also establishes the following attributes from the authentication profile of the account associated with the login user ID of the invok-
       ing process: Audit control and disposition masks Kernel authorizations

DIAGNOSTICS

       The at and batch programs will refuse to accept jobs submitted from processes whose login user ID is different from the real user ID.

FILES

       Specifies the command path.  Main cron directory Directory containing the crontab files.  List of allowed users.  List of denied users His-
       tory information for cron Queue description file for at, batch, and cron

RELATED INFORMATION

       Commands:  at(1), crontab(1), rc0(8), rc2(8), rc3(8)

       Files: queuedefs(4) delim off

																	   cron(8)