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Full Discussion: Birthday Calculation
Top Forums Shell Programming and Scripting Birthday Calculation Post 302272381 by cfajohnson on Tuesday 30th of December 2008 12:17:42 PM
Old 12-30-2008
Quote:
Originally Posted by fpmurphy
]
Afraid it is supported by IEEE 1003.1:2004.

No, It is neither supported nor required. In fact, it's behaviour is not even specified.
Quote:
Under shell command language reserved words section:

Reserved words are words that have special meaning to the shell
.....
The following words may be recognized as reserved words on some implementations (when none of the characters are quoted), causing unspecified results:

[[ ]] function select
......

A POSIX shell is not required to support it, and if it does, it could do anything at all, including erase the contents of you hard drive.
 

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MAN(7)							 Miscellaneous Information Manual						    MAN(7)

NAME
man - macros to typeset manual SYNOPSIS
nroff -man file ... troff -man file ... DESCRIPTION
These macros are used to lay out pages of this manual. A skeleton page may be found in the file /usr/man/man.template. Any text argument t may be zero to six words. Quotes may be used to include blanks in a `word'. If text is empty, special treatment is applied to the next input line with text to be printed. In this way .I may be used to italicize a whole line, or .SM may be followed by .B to make small bold letters. A prevailing indent distance is remembered between successive indented paragraphs, and is reset to default value upon reaching a non- indented paragraph. Default units for indents i are ens. Type font and size are reset to default values before each paragraph, and after processing font and size setting macros. These strings are predefined by -man: *R `(Reg)', trademark symbol in troff. *S Change to default type size. FILES
/usr/share/tmac/tmac.an /usr/man/man.template SEE ALSO
troff(1), man(1) BUGS
Relative indents don't nest. REQUESTS
Request Cause If no Explanation Break Argument .B t no t=n.t.l.*Text t is bold. .BI t no t=n.t.l. Join words of t alternating bold and italic. .BR t no t=n.t.l. Join words of t alternating bold and Roman. .DT no .5i 1i...Restore default tabs. .HP i yes i=p.i.* Set pre- vailing indent to i. Begin paragraph with hanging indent. .I t no t=n.t.l. Text t is italic. .IB t no t=n.t.l. Join words of t alternating italic and bold. .IP x i yes x="" Same as .TP with tag x. .IR t no t=n.t.l. Join words of t alternating italic and Roman. .LP yes - Same as .PP. .PD d no d=.4v Interparagraph distance is d. .PP yes - Begin paragraph. Set prevailing indent to .5i. .RE yes - End of relative indent. Set prevailing indent to amount of starting .RS. .RB t no t=n.t.l. Join words of t alternating Roman and bold. .RI t no t=n.t.l. Join words of t alternating Roman and italic. .RS i yes i=p.i. Start relative indent, move left margin in distance i. Set prevailing indent to .5i for nested indents. .SH t yes t=n.t.l. Subhead. .SM t no t=n.t.l. Text t is small. .TH n c x v m yes -Begin page named n of chapter c; x is extra commentary, e.g. `local', for page foot center; v alters page foot left, e.g. `4th Berkeley Distribution'; m alters page head center, e.g. `Brand X Programmer's Manual'. Set prevailing indent and tabs to .5i. .TP i yes i=p.i. Set prevailing indent to i. Begin indented paragraph with hanging tag given by next text line. If tag doesn't fit, place it on separate line. * n.t.l. = next text line; p.i. = prevailing indent 7th Edition October 22, 1996 MAN(7)
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