GNU bash, version 4.1.5(1)-release (x86_64-pc-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 [&] history [-c] [-d offset] [n] or hist> (( expression )) if COMMANDS; then COMMANDS; [ elif C> . filename [arguments] jobs [-lnprs] [jobspec ...] or jobs > : kill [-s sigspec | -n signum | -sigs> [ arg... ] let arg [arg ...] [[ expression ]] local [option] name[=value] ... alias [-p] [name[=value] ... ] logout [n] bg [job_spec ...] mapfile [-n count] [-O origin] [-s c> bind [-lpvsPVS] [-m keymap] [-f filen> 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]...)> read [-ers] [-a array] [-d delim] [-> cd [-L|-P] [dir] readarray [-n count] [-O origin] [-s> command [-pVv] command [arg ...] readonly [-af] [name[=value] ...] or> compgen [-abcdefgjksuv] [-o option] > return [n] complete [-abcdefgjksuv] [-pr] [-DE] > select NAME [in WORDS ... ;] do COMM> compopt [-o|+o option] [-DE] [name ..> set [--abefhkmnptuvxBCHP] [-o option> continue [n] shift [n] coproc [NAME] command [redirections] shopt [-pqsu] [-o] [optname ...] declare [-aAfFilrtux] [-p] [name[=val> 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] [na> times eval [arg ...] trap [-lp] [[arg] signal_spec ...] exec [-cl] [-a name] [command [argume> true exit [n] type [-afptP] name [name ...] export [-fn] [name[=value] ...] or ex> typeset [-aAfFilrtux] [-p] name[=val> false ulimit [-SHacdefilmnpqrstuvx] [limit> fc [-e ename] [-lnr] [first] [last] o> umask [-p] [-S] [mode] fg [job_spec] unalias [-a] name [name ...] for NAME [in WORDS ... ] ; do COMMAND> unset [-f] [-v] [name ...] for (( exp1; exp2; exp3 )); do COMMAN> until COMMANDS; do COMMANDS; done function name { COMMANDS ; } or name > variables - Names and meanings of so> getopts optstring name [arg] wait [id] hash [-lr] [-p pathname] [-dt] [name > while COMMANDS; do COMMANDS; done help [-dms] [pattern ...] { COMMANDS ; }
另外一种选择是使用下列命令：
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compgen -b compgen -b | more
查看 Bash 的内置命令信息
运行以下得到详细信息：
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helpcommand helpread
要仅得到所有带简短描述的内置命令的列表，执行如下:
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$ help -d
查找内置命令的语法和其他选项
使用下列语法去找出更多的相关内置命令：
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help name helpcd helpfg helpfor helpread help :
样例输出：
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:: : Null command. No effect; the command does nothing. Exit Status: Always succeeds
找出一个命令是内部的（内置）还是外部的
使用 type 命令或 command 命令：
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type-a command-name-here type-a cd type-a uname type-a : type-a ls
或者：
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type -a cduname : lsuname
样例输出：
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cd is a shell builtin uname is /bin/uname : is a shell builtin ls isaliased to `ls --color=auto' ls is /bin/ls l is a function l () { ls --color=auto }
