    ,   . -
    trap    /(lev/null   
,  trap     .   -
  rm       . 
    /dev/null,    .

   

 . 28.6      .  
,         ,  
 " "  7.

 28.6.  
   

:             0  true ( null, .   "  null").

        
(.  "      
. ()  source"  9).

bg               (.  ":    
"  9).

break          for, while  until (.  "break  continue"   -
 ).

cd              (.  "cd:   "  6).

continue        for, while  until (.  "break 
continue"    ).

echo           (.  "echo:  "  5).
eval              (.  ""    ).

              (.  ": 
"    ).

exit            (  ,   <CONTROL+D>)
(.  "$?   "  9).

export            (  ) (.
 "export:    "  9).

fg               (.  "fg:    -
 "  9).

getopts        .

jobs                 (.  "jobs: -
  "  9).

kill             (.  "kill:   "
 11).

pwd             (.  " "  6).

read             (.  "read:  , 
"  9).

readonly          (.  "readonly: -
  "  9).

906                                                  VI. 