bash: Job Control Variables

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1 7.3 Job Control Variables
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1 'auto_resume'
1      This variable controls how the shell interacts with the user and
1      job control.  If this variable exists then single word simple
1      commands without redirections are treated as candidates for
1      resumption of an existing job.  There is no ambiguity allowed; if
1      there is more than one job beginning with the string typed, then
1      the most recently accessed job will be selected.  The name of a
1      stopped job, in this context, is the command line used to start it.
1      If this variable is set to the value 'exact', the string supplied
1      must match the name of a stopped job exactly; if set to
1      'substring', the string supplied needs to match a substring of the
1      name of a stopped job.  The 'substring' value provides
11      functionality analogous to the '%?' job ID (⇒Job Control
      Basics).  If set to any other value, the supplied string must be
1      a prefix of a stopped job's name; this provides functionality
1      analogous to the '%' job ID.
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