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[kygs@wht163 ~]$ help                                                        
GNU bash, version 3.2.25(1)-release (i686-redhat-linux-gnu)                  
These shell commands are defined internally.  Type `help' to see this list.  
Type `help name' to find out more about the function `name'.                 
Use `info bash' to find out more about the shell in general.                 
Use `man -k' or `info' to find out more about commands not in this list.     
                                                                             
A star (*) next to a name means that the command is disabled.                
                                                                             
 JOB_SPEC [&]                       (( ｅxpression ))                         
 . filename [arguments]             :                                        
 [ arg... ]                         [[ ｅxpression ]]                         
 alias [-p] [name[=value] ... ]     bg [job_spec ...]                        
 bind [-lpvsPVS] [-m keymap] [-f fi break [n]                                
 builtin [shell-builtin [arg ...]]  caller [EXPR]                            
 case WORD in [PATTERN [| PATTERN]. cd [-L|-P] [dir]                         
 command [-pVv] command [arg ...]   compgen [-abcdefgjksuv] [-o option       
 complete [-abcdefgjksuv] [-pr] [-o continue [n]                             
 declare [-afFirtx] [-p] [name[=val dirs [-clpv] [+N] [-N]                   
 disown [-h] [-ar] [jobspec ...]    echo [-neE] [arg ...]                    
 enable [-pnds] [-a] [-f filename]  eval [arg ...]                           
 exec [-cl] [-a name] file [redirec exit [n]                                 
 export [-nf] [name[=value] ...] or false                                    
 fc [-e ename] [-nlr] [first] [last fg [job_spec]                            
 for NAME [in WORDS ... ;] do COMMA for (( exp1; exp2; exp3 )); do COM       
 function NAME { COMMANDS ; } or NA getopts optstring name [arg]             
 hash [-lr] [-p pathname] [-dt] [na help [-s] [pattern ...]                  
 history [-c] [-d offset] [n] or hi if COMMANDS; then COMMANDS; [ elif       
 jobs [-lnprs] [jobspec ...] or job kill [-s sigspec | -n signum | -si       
 let arg [arg ...]                  local name[=value] ...                   
 logout                             popd [+N | -N] [-n]                      
 printf [-v var] format [arguments] pushd [dir | +N | -N] [-n]               
 pwd [-LP]                          read [-ers] [-u fd] [-t timeout] [       
 readonly [-af] [name[=value] ...]  return [n]                               
 select NAME [in WORDS ... ;] do CO set [--abefhkmnptuvxBCHP] [-o opti       
 shift [n]                          shopt [-pqsu] [-o long-option] opt       
 source filename [arguments]        suspend [-f]                             
 test [expr]                        time [-p] PIPELINE                       
 times                              trap [-lp] [arg signal_spec ...]         
 true                               type [-afptP] name [name ...]            
 typeset [-afFirtx] [-p] name[=valu ulimit [-SHacdfilmnpqstuvx] [limit       
 umask [-p] [-S] [mode]             unalias [-a] name [name ...]             
 unset [-f] [-v] [name ...]         until COMMANDS; do COMMANDS; done        
 variables - Some variable names an wait [n]                                 
 while COMMANDS; do COMMANDS; done  { COMMANDS ; }                           
[kygs@wht163 ~]$