sh-posix.1 (2010 09)

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sh-posix(1) sh-posix(1)

LC_ALL The overriding value for LANG and the

LC_* variables. See environ (5).

LC_COLLATE The collating sequence to use when sorting names and when character ranges occur in

patterns. See environ (5).

LC_CTYPE The character classiﬁcation information to use. Changing the value of

LC_CTYPE after

the shell has started does not affect the lexical processing of shell commands in the

current shell execution environment or its subshells. See environ (5).

The shell uses

LC_CTYPE to detect nonprintable characters in the input and tries to han-

dle them when the emacs, gmacs,or

vi editing mode is selected. Not starting a new

shell session after setting

LC_CTYPE may affect the display of nonprintable input char-

acters in the emacs, gmacs,or

vi editing mode.

LC_MESSAGES

The language in which system messages appear, and the language that the system

expects for user input of yes and no

strings. See environ (5).

LC_MONETARY

The currency symbol and monetary value format. See environ (5).

LC_NUMERIC The numeric format. See environ (5).

LC_TIME The date and time format. See environ (5).

LINES If this variable is set, the value is used to determine the column length for printing

select lists. select lists print vertically until about two-thirds of LINES lines are

ﬁlled.

MAIL If this parameter is set to the name of a mail ﬁle and the

MAILPATH parameter is not

set, the shell informs the user of arrival of mail in the speciﬁed ﬁle.

MAILCHECK How often (in seconds) the shell checks for changes in the modiﬁcation time of any of the

ﬁles speciﬁed by the

MAILPATH or MAIL parameters. The default value is 600 seconds.

When the time has elapsed, the shell checks before issuing the next prompt.

MAILPATH A list of ﬁle names separated by colons. If this parameter is set, the shell informs the

user of any modiﬁcations to the speciﬁed ﬁles that have occurred within the last

MAIL-

CHECK seconds. Each ﬁle name can be followed by a ? and a message to be printed, in

which case the message will undergo parameter and command substitution with the

parameter $_ deﬁned as the name of the changed ﬁle. The default message is

you

have mail in $_.

NLSPATH The search path for message catalogs, a list of directories separated by colons.

PATH The search path for commands, a list of directories separated by colons. See the Execu-

tion subsection.

PS1 The value of this parameter is expanded for parameter substitution, to deﬁne the pri-

mary prompt string. The default value is "$ ". The character ! in the primary prompt

string is replaced by the command number. See the Command Reentry subsection.

PS2 Secondary prompt string for command completion. The default value is "> ".

PS3 Selection prompt string used within a select loop. If unset, it defaults to "#? ".

PS4 Execution trace string that precedes each line of an execution trace. See the set -x

special command. If unset, it defaults to "+ ".

SHELL The path name of the shell is kept in the environment. When invoked, the shell is res-

tricted if the value of this variable contains an r in the base name.

TMOUT If set to a value greater than zero, the shell will terminate if a command is not entered

within the prescribed number of seconds after issuing the PS1 prompt. (Note that the

shell can be compiled with a maximum bound for this value which cannot be exceeded.)

VISUAL Invokes the corresponding option when the value of this variable ends in emacs, gmacs,

or vi. See the set -o special command.

The shell gives default values to

IFS, MAILCHECK, PATH, PS1, PS2, and TMOUT. On the other hand,

MAIL, ENV, HOME, and SHELL are never set automatically by the shell (although HOME, MAIL, and

SHELL are set by login; see login (1)).

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