1BASH_BUILTINS(1) General Commands Manual BASH_BUILTINS(1)
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6 bash, :, ., [, alias, bg, bind, break, builtin, caller, cd, command,
7 compgen, complete, compopt, continue, declare, dirs, disown, echo,
8 enable, eval, exec, exit, export, false, fc, fg, getopts, hash, help,
9 history, jobs, kill, let, local, logout, mapfile, popd, printf, pushd,
10 pwd, read, readonly, return, set, shift, shopt, source, suspend, test,
11 times, trap, true, type, typeset, ulimit, umask, unalias, unset, wait -
12 bash built-in commands, see bash(1)
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15 Unless otherwise noted, each builtin command documented in this section
16 as accepting options preceded by - accepts -- to signify the end of the
17 options. The :, true, false, and test/[ builtins do not accept options
18 and do not treat -- specially. The exit, logout, return, break, con‐
19 tinue, let, and shift builtins accept and process arguments beginning
20 with - without requiring --. Other builtins that accept arguments but
21 are not specified as accepting options interpret arguments beginning
22 with - as invalid options and require -- to prevent this interpreta‐
23 tion.
24 : [arguments]
25 No effect; the command does nothing beyond expanding arguments
26 and performing any specified redirections. The return status is
27 zero.
28 . filename [arguments]
30 source filename [arguments]
31 Read and execute commands from filename in the current shell
32 environment and return the exit status of the last command exe‐
33 cuted from filename. If filename does not contain a slash,
34 filenames in PATH are used to find the directory containing
35 filename. The file searched for in PATH need not be executable.
36 When bash is not in posix mode, the current directory is
37 searched if no file is found in PATH. If the sourcepath option
38 to the shopt builtin command is turned off, the PATH is not
39 searched. If any arguments are supplied, they become the posi‐
40 tional parameters when filename is executed. Otherwise the
41 positional parameters are unchanged. If the -T option is
42 enabled, source inherits any trap on DEBUG; if it is not, any
43 DEBUG trap string is saved and restored around the call to
44 source, and source unsets the DEBUG trap while it executes. If
45 -T is not set, and the sourced file changes the DEBUG trap, the
46 new value is retained when source completes. The return status
47 is the status of the last command exited within the script (0 if
48 no commands are executed), and false if filename is not found or
49 cannot be read.
50 alias [-p] [name[=value] ...]
52 Alias with no arguments or with the