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Full Discussion: Bash INKEY$ function...
Top Forums UNIX for Dummies Questions & Answers Bash INKEY$ function... Post 302785495 by wisecracker on Monday 25th of March 2013 05:51:01 PM
Old 03-25-2013
Bash INKEY$ function...
This is probably common knowledge to the professionals but not so much for amateurs like
myself.

This is a code snippet for the equivalent of BASIC's...

LET char$=INKEY$

As the timeout parameter cannot be less than 1 second then this is the only limitation...

It is a single line function which has a variable "char"...

Read the code for more information...

Issued as Public Domain...

Code:
#!/bin/bash

# An INKEY$ function for bash!
inkey() { char="" ; read -p "" -n1 -s -t1 char ; }
# Similar to BASIC's LET char$=INKEY$

# Do you remember INKEY$ in BASIC programming?
# Example:-
#
# PRINT "Some prompt:- "
# some_label:
# LET char$=INKEY$
# IF char$="<some_character>" THEN <do_something>
# IF char$="" THEN <do_something_else>
# GOTO some_label

# This is just a test piece only...
while true
do
	printf "Some prompt:- "
	# This is LET char$=INKEY$...
	inkey
	printf "Key pressed:- '$char'...\n"
	if [ "$char" == "q" ]
	then
		printf "Quitting... \n"
		break
	fi
	if [ "$char" == "" ]
	then
		printf "Timeout works OK...\n"
	fi
	if [ "$char" == "b" ]
	then
		printf "Barry Walker...\n"
	fi
done

 

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LEARN ABOUT MOJAVE

dxprintf

XPRINTF(3)						   BSD Library Functions Manual 						XPRINTF(3)

NAME

     asxprintf, dxprintf, fxprintf, sxprintf, xprintf, vasxprintf, vdxprintf, vfxprintf, vsxprintf, vxprintf -- extensible printf

SYNOPSIS

     #include <printf.h>

     int
     asxprintf(char ** restrict ret, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     int
     dxprintf(int fd, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     int
     fxprintf(FILE * restrict stream, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     int
     sxprintf(char * restrict str, size_t size, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     int
     xprintf(printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, ...);

     #include <stdarg.h>

     int
     vasxprintf(char ** restrict ret, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap);

     int
     vdxprintf(int fd, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap);

     int
     vfxprintf(FILE * restrict stream, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap);

     int
     vsxprintf(char * restrict str, size_t size, printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format,
	 va_list ap);

     int
     vxprintf(printf_domain_t restrict domain, locale_t restrict loc, const char * restrict format, va_list ap);

DESCRIPTION

     These extensible printf (see xprintf(5)) variants behave like their normal printf counterparts (see printf(3)) without 'x' in the name
     (except sxprintf() and vsxprintf() behave like snprintf() and vsnprintf(), respectively).

     The domain argument must be a pointer to a printf domain structure, as returned by one of the functions described in xprintf_domain(3).  The
     loc argument should be an extended locale (see xlocale(3)) or NULL, which means to use the current locale in effect (either the per-thread
     locale if set, or the global locale by default).

SEE ALSO

     printf(3), xlocale(3), xprintf_domain(3), xprintf(5)

Darwin								   Aug 19, 2012 							    Darwin
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