__Bash__ itself returns the exit status of the last command executed, unless a syntax error occurs, in which case it exits with a non-zero value. See also the __exit__ builtin command below. 

  

 !!SIGNALS 

  

  

  

  

 When __bash__ receives a signal for which a trap has been set while waiting for a command to complete, the trap will not be executed until the command completes. When __bash__ is waiting for an asynchronous command via the __wait__ builtin, the reception of a signal for which a trap has been set will cause the __wait__ builtin to return immediately with an exit status greater than 128, immediately after which the trap is executed. 

  

 !!JOB CONTROL 

  

  

 indicating that this job is job number 1 and that the process ID of the last process in the pipeline associated with this job is 25647. All of the processes in a single pipeline are members of the same job. __Bash__ uses the ''job'' abstraction as the basis for job control. 

  

  

 If the operating system on which __bash__ is running supports job control, __bash__ contains facilities to use it. Typing the ''suspend'' character (typically __^Z__ , Control-Z) while a process is running causes that process to be stopped and returns control to __bash__ . Typing the ''delayed suspend'' character (typically __^Y__ , Control-Y) causes the process to be stopped when it attempts to read input from the terminal, and control to be returned to __bash__ . The user may then manipulate the state of this job, using the __bg__ command to continue it in the background, the __fg__ command to continue it in the foreground, or the __kill__ command to kill it. A __^Z__ takes effect immediately, and has the additional side effect of causing pending output and typeahead to be discarded. 

  

 There are a number of ways to refer to a job in the shell. The character __%__ introduces a job name. Job number ''n'' may be referred to as __%n__ . A job may also be referred to using a prefix of the name used to start it, or using a substring that appears in its command line. For example, __%ce__ refers to a stopped __ce__ job. If a prefix matches more than one job, __bash__ reports an error. Using __%?ce__ , on the other hand, refers to any job containing the string __ce__ in its command line. If the substring matches more than one job, __bash__ reports an error. The symbols __%%__ and __%+__ refer to the shell's notion of the ''current job'' , which is the last job stopped while it was in the foreground or started in the background. The ''previous job'' may be referenced using __%-__ . In output pertaining to jobs (e.g., the output of the __jobs__ command), the current job is always flagged with a __+__ , and the previous job with a __-__ .