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printf(1): Add EXAMPLES section

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* Small addition with four simple examples
 * While here, remove three obsolete .Tn macros

Approved by:	manpages (gbe)
Differential Revision:	https://reviews.freebsd.org/D25462
This commit is contained in:
fernape 2020-07-01 16:33:32 +00:00
parent 22822c3e20
commit cb97646e80
1 changed files with 42 additions and 9 deletions
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51
usr.bin/printf/printf.1
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@ -31,7 +31,7 @@
.\" @(#)printf.1 8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd July 29, 2019
.Dd July 1, 2020
.Dt PRINTF 1
.Os
.Sh NAME
@ -316,12 +316,48 @@ Consult the
manual page.
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
Print the string
.Qq hello :
.Bd -literal -offset indent
$ printf "%s\en" hello
hello
.Ed
.Pp
Same as above, but notice that the format string is not quoted and hence we
do not get the expected behavior:
.Bd -literal -offset indent
$ printf %s\en hello
hellon$
.Ed
.Pp
Print arguments forcing sign only for the first argument:
.Bd -literal -offset indent
$ printf "%+d\en%d\en%d\en" 1 -2 13
+1
-2
13
.Ed
.Pp
Same as above, but the single format string will be applied to the three
arguments:
.Bd -literal -offset indent
$ printf "%+d\en" 1 -2 13
+1
-2
+13
.Ed
.Pp
Print number using only two digits after the decimal point:
.Bd -literal -offset indent
$ printf "%.2f\en" 31.7456
31.75
.Ed
.Sh COMPATIBILITY
The traditional
.Bx
behavior of converting arguments of numeric formats not beginning
with a digit to the
.Tn ASCII
with a digit to the ASCII
code of the first character is not supported.
.Sh SEE ALSO
.Xr builtin 1 ,
@ -343,8 +379,7 @@ It is modeled
after the standard library function,
.Xr printf 3 .
.Sh CAVEATS
.Tn ANSI
hexadecimal character constants were deliberately not provided.
ANSI hexadecimal character constants were deliberately not provided.
.Pp
Trying to print a dash ("-") as the first character causes
.Nm
@ -364,10 +399,8 @@ and
formats with a precision
may not operate as expected.
.Sh BUGS
Since the floating point numbers are translated from
.Tn ASCII
to floating-point and
then back again, floating-point precision may be lost.
Since the floating point numbers are translated from ASCII
to floating-point and then back again, floating-point precision may be lost.
(By default, the number is translated to an IEEE-754 double-precision
value before being printed.
The