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380.

The `if COMMANDS' list is executed. If its exit status is zero, then the
`then COMMANDS' list is executed. Otherwise, each `elif COMMANDS' list is
executed in turn, and if its exit status is zero, the corresponding
`then COMMANDS' list is executed and the if command completes. Otherwise,
the `else COMMANDS' list is executed, if present. The exit status of the
entire construct is the exit status of the last command executed, or zero
if no condition tested true.

381.

Expand and execute COMMANDS as long as the final command in the
`while' COMMANDS has an exit status of zero.

382.

Expand and execute COMMANDS as long as the final command in the
`until' COMMANDS has an exit status which is not zero.

384.

Run a set of commands in a group. This is one way to redirect an
entire set of commands.

385.

Equivalent to the JOB_SPEC argument to the `fg' command. Resume a
stopped or background job. JOB_SPEC can specify either a job name
or a job number. Following JOB_SPEC with a `&' places the job in
the background, as if the job specification had been supplied as an
argument to `bg'.

386.

The EXPRESSION is evaluated according to the rules for arithmetic
evaluation. Equivalent to "let EXPRESSION".

387.

Returns a status of 0 or 1 depending on the evaluation of the conditional
expression EXPRESSION. Expressions are composed of the same primaries used
by the `test' builtin, and may be combined using the following operators

[tab]( EXPRESSION )[tab]Returns the value of EXPRESSION
[tab]! EXPRESSION[tab]True if EXPRESSION is false; else false
[tab]EXPR1 && EXPR2[tab]True if both EXPR1 and EXPR2 are true; else false
[tab]EXPR1 || EXPR2[tab]True if either EXPR1 or EXPR2 is true; else false

When the `==' and `!=' operators are used, the string to the right of the
operator is used as a pattern and pattern matching is performed. The
&& and || operators do not evaluate EXPR2 if EXPR1 is sufficient to
determine the expression's value.

388.

BASH_VERSION[tab]Version information for this Bash.
CDPATH[tab]A colon-separated list of directories to search
[tab][tab]for directries given as arguments to `cd'.
GLOBIGNORE[tab]A colon-separated list of patterns describing filenames to
[tab][tab]be ignored by pathname expansion.
HISTFILE[tab]The name of the file where your command history is stored.
HISTFILESIZE[tab]The maximum number of lines this file can contain.
HISTSIZE[tab]The maximum number of history lines that a running
[tab][tab]shell can access.
HOME[tab]The complete pathname to your login directory.
HOSTNAME[tab]The name of the current host.
HOSTTYPE[tab]The type of CPU this version of Bash is running under.
IGNOREEOF[tab]Controls the action of the shell on receipt of an EOF
[tab][tab]character as the sole input. If set, then the value
[tab][tab]of it is the number of EOF characters that can be seen
[tab][tab]in a row on an empty line before the shell will exit
[tab][tab](default 10). When unset, EOF signifies the end of input.
MACHTYPE[tab]A string describing the current system Bash is running on.
MAILCHECK[tab]How often, in seconds, Bash checks for new mail.
MAILPATH[tab]A colon-separated list of filenames which Bash checks
[tab][tab]for new mail.
OSTYPE[tab]The version of Unix this version of Bash is running on.
PATH[tab]A colon-separated list of directories to search when
[tab][tab]looking for commands.
PROMPT_COMMAND[tab]A command to be executed before the printing of each
[tab][tab]primary prompt.
PS1[tab][tab]The primary prompt string.
PS2[tab][tab]The secondary prompt string.
PWD[tab][tab]The full pathname of the current directory.
SHELLOPTS[tab]A colon-separated list of enabled shell options.
TERM[tab]The name of the current terminal type.
TIMEFORMAT[tab]The output format for timing statistics displayed by the
[tab][tab]`time' reserved word.
auto_resume[tab]Non-null means a command word appearing on a line by
[tab][tab]itself is first looked for in the list of currently
[tab][tab]stopped jobs. If found there, that job is foregrounded.
[tab][tab]A value of `exact' means that the command word must
[tab][tab]exactly match a command in the list of stopped jobs. A
[tab][tab]value of `substring' means that the command word must
[tab][tab]match a substring of the job. Any other value means that
[tab][tab]the command must be a prefix of a stopped job.
histchars[tab]Characters controlling history expansion and quick
[tab][tab]substitution. The first character is the history
[tab][tab]substitution character, usually `!'. The second is
[tab][tab]the `quick substitution' character, usually `^'. The
[tab][tab]third is the `history comment' character, usually `#'.
HISTIGNORE[tab]A colon-separated list of patterns used to decide which
[tab][tab]commands should be saved on the history list.

389.

Adds a directory to the top of the directory stack, or rotates
the stack, making the new top of the stack the current working
directory. With no arguments, exchanges the top two directories.

+N[tab]Rotates the stack so that the Nth directory (counting
[tab]from the left of the list shown by `dirs', starting with
[tab]zero) is at the top.

-N[tab]Rotates the stack so that the Nth directory (counting
[tab]from the right of the list shown by `dirs', starting with
[tab]zero) is at the top.

-n[tab]suppress the normal change of directory when adding directories
[tab]to the stack, so only the stack is manipulated.

dir[tab]adds DIR to the directory stack at the top, making it the
[tab]new current working directory.

You can see the directory stack with the `dirs' command.

390.

Removes entries from the directory stack. With no arguments,
removes the top directory from the stack, and cd's to the new
top directory.

+N[tab]removes the Nth entry counting from the left of the list
[tab]shown by `dirs', starting with zero. For example: `popd +0'
[tab]removes the first directory, `popd +1' the second.

-N[tab]removes the Nth entry counting from the right of the list
[tab]shown by `dirs', starting with zero. For example: `popd -0'
[tab]removes the last directory, `popd -1' the next to last.

-n[tab]suppress the normal change of directory when removing directories
[tab]from the stack, so only the stack is manipulated.

You can see the directory stack with the `dirs' command.