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Top Forums Shell Programming and Scripting allow only alphnumeric entry and an underscore Post 302323878 by panyam on Tuesday 9th of June 2009 09:09:19 AM
Old 06-09-2009
Code:
https://www.unix.com/shell-programming-scripting/44098-ksh-test-if-string-contains-alphanumeric.html

even this u can try :

Code:
echo 's$' | awk '$0 ~ /[^a-zA-Z0-9]/ { print "fail" }'


Last edited by panyam; 06-09-2009 at 10:21 AM..
 

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CURSES_UNDERSCORE(3)					   BSD Library Functions Manual 				      CURSES_UNDERSCORE(3)

NAME
curses_underscore, underscore, underend, wunderscore, wunderend -- curses underscore attribute manipulation routines LIBRARY
Curses Library (libcurses, -lcurses) SYNOPSIS
#include <curses.h> int underscore(void); int underend(void); int wunderscore(void); int wunderend(void); DESCRIPTION
These functions manipulate the underscore attribute on stdscr or on the specified window. The underscore() function turns on the underscore attribute on stdscr. The underend() function turns off the underscore attribute on stdscr. The wunderscore() and wunderend() functions are equivalent to underscore() and underend(), respectively, excepting that the attribute is manipulated on the window specified by win. The underscore() and underend() functions are equivalent to wattron(A_UNDERLINE) and wattroff(A_UNDERLINE), respectively. RETURN VALUES
These functions always return 1. SEE ALSO
curses_attributes(3), curses_standout(3) STANDARDS
The NetBSD Curses library complies with the X/Open Curses specification, part of the Single Unix Specification. HISTORY
These functions first appeared in NetBSD 1.5. BSD
October 13, 2002 BSD
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