方法一： 通过help命令查看
job_spec [&]
history [-c] [-d offset] [n] or history -anrw [filename] or history -ps arg [arg...]
(( expression ))
if COMMANDS; then COMMANDS; [ elif COMMANDS; then COMMANDS; ]... [ else COMMANDS; ] fi
. filename [arguments]
jobs [-lnprs] [jobspec ...] or jobs -x command [args]
:
kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]
[ arg... ]
let arg [arg ...]
[[ expression ]]
local [option] name[=value] ...
alias [-p] [name[=value] ... ]
logout [n]
bg [job_spec ...]
mapfile [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
bind [-lpvsPVS] [-m keymap] [-f filename] [-q name] [-u name] [-r keyseq] [-x keyseq:shell-command] [keyseq:read>
popd [-n] [+N | -N]
break [n]
printf [-v var] format [arguments]
builtin [shell-builtin [arg ...]]
pushd [-n] [+N | -N | dir]
caller [expr]
pwd [-LP]
case WORD in [PATTERN [| PATTERN]...) COMMANDS ;;]... esac
read [-ers] [-a array] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [name ...]>
cd [-L|[-P [-e]]] [dir]
readarray [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array]
command [-pVv] command [arg ...]
readonly [-aAf] [name[=value] ...] or readonly -p
compgen [-abcdefgjksuv] [-o option] [-A action] [-G globpat] [-W wordlist] [-F function] [-C command] [-X filt>
return [n]
complete [-abcdefgjksuv] [-pr] [-DE] [-o option] [-A action] [-G globpat] [-W wordlist] [-F function] [-C comma>
select NAME [in WORDS ... ;] do COMMANDS; done
compopt [-o|+o option] [-DE] [name ...]
set [-abefhkmnptuvxBCHP] [-o option-name] [--] [arg ...]
continue [n]
shift [n]
coproc [NAME] command [redirections]
shopt [-pqsu] [-o] [optname ...]
declare [-aAfFgilrtux] [-p] [name[=value] ...]
source filename [arguments]
dirs [-clpv] [+N] [-N]
suspend [-f]
disown [-h] [-ar] [jobspec ...]
test [expr]
echo [-neE] [arg ...]
time [-p] pipeline
enable [-a] [-dnps] [-f filename] [name ...]
times
eval [arg ...]
trap [-lp] [[arg] signal_spec ...]
exec [-cl] [-a name] [command [arguments ...]] [redirection ...]
true
exit [n]
type [-afptP] name [name ...]
export [-fn] [name[=value] ...] or export -p
typeset [-aAfFgilrtux] [-p] name[=value] ...
false
ulimit [-SHacdefilmnpqrstuvx] [limit]
fc [-e ename] [-lnr] [first] [last] or fc -s [pat=rep] [command]
umask [-p] [-S] [mode]
fg [job_spec]
unalias [-a] name [name ...]
for NAME [in WORDS ... ] ; do COMMANDS; done
unset [-f] [-v] [name ...]
for (( exp1; exp2; exp3 )); do COMMANDS; done
until COMMANDS; do COMMANDS; done
function name { COMMANDS ; } or name () { COMMANDS ; }
variables - Names and meanings of some shell variables
getopts optstring name [arg]
wait [id]
hash [-lr] [-p pathname] [-dt] [name ...]
while COMMANDS; do COMMANDS; done
help [-dms] [pattern ...]
{ COMMANDS ; }
方法二：通过compgen命令查看
[root@vm ~]# compgen -b
.
:
[
alias
bg
bind
break
builtin
caller
cd
command
compgen
complete
compopt
continue
declare
dirs
disown
echo
enable
eval
exec
exit
export
false
fc
fg
getopts
hash
help
history
jobs
kill
let
local
logout
mapfile
popd
printf
pushd
pwd
read
readarray
readonly
return
set
shift
shopt
source
suspend
test
times
trap
true
type
typeset
ulimit
umask
unalias
unset
wait
方法一： type命令
[root@vm ~]# type type
type is a shell builtin
- type命令本身也是bash内建命令
help type查看内置命令type的帮助信息
方法二： command命令
- 如果是內置命令，command默认没有输出，可以添加-V参数显示详细信息
help command查看内置命令command的帮助信息
- 内建命令通过help(内建命令)来获取帮助信息
