Guide to LaTeX (4th Edition) (Tools and Techniques

572 Appendix H. Command Summary
\ProvidesPackage{class}[version] [p] . . . . . . . . . (D.2.1) – 441
At the beginning of a package file, this statement declares the name
of the package and its version, to be checked against the name and
version in the \usepackage or \RequirePackage command that
input it. The version specification, if present, consists of three parts:
date, version number, and additional information. Example:
\ProvidesPackage{notes}[1995/02/13 1.2 G. Smith]
\ProvideTextCommand{\cmd}{code}[narg][opt]{def } [p]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . (A.3.7) – 379
Defines \cmd in the same way as \providecommand except the definition
is only valid when encoding code is active. If the command
\cmd is already defined for that encoding, it is not redefined.
\ProvideTextCommandDefault{\cmd}{code}[narg][opt]{def } [p]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . (A.3.7) – 380
Is the same as \DeclareTextCommandDefault except that if a default
encoding definition already exists for \cmd, then no redefinition
occurs and the previous definition is retained.
\ps text . . . . . . . . . . . . . . . . . . . . . . . . (16.1) – 353
Adds a postscript to a letter in the letter document class.
\Psi [m] produces Ψ . . . . . . . . . . . . . . . . . . (5.3.1) – 125
\psi [m] produces ψ . . . . . . . . . . . . . . . . . . (5.3.1) – 125
\pushtabs . . . . . . . . . . . . . . . . . . . . . . . . (4.6.4) – 83
Saves the current set of tabulator stops in the tabbing environment.
It may be recalled with the \poptabs command.
\put(x,y){pic elem} . . . . . . . . . . . . . . . . . (13.1.3) – 289
The positioning command within a picture environment. The picture
element pic elem is placed with its reference point at the location
(x, y).
\qbezier[num](x1,y1)(x2,y2)(x3,y3) . . . . . . (13.1.4) – 299
This command can be given within the picture environment to
draw a quadratic Bézier curve from point (x1,y1) to (x3,y3), using
(x2,y2) as the extra Bézier point. The curve is drawn as num +
1 dots if the optional argument num is given, otherwise num is
calculated automatically to produce a solid line. It is the same as
\bezier except that num is optional.
\quad . . . . . . . . . . . . . . . . . . . . . . . . . . (2.7.1) – 30
Inserts horizontal spacing of size 1 em.
\qquad . . . . . . . . . . . . . . . . . . . . . . . . . . (2.7.1) – 30
Inserts horizontal spacing of size 2 em.