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Top Forums Shell Programming and Scripting Use of { } in scripting - Need help Post 302156125 by Sathy153 on Monday 7th of January 2008 10:57:49 AM
Old 01-07-2008
Use of { } in scripting - Need help

Would like to know how the below command works..in scripting

t1=${1:?"$str"}

If I pass one argument with script, t1 will be assigned with that argument irrespective of $str. I am not sure of this entire syntax.

Please anyone explain the above syntax.
 

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curs_addstr(3CURSES)					     Curses Library Functions					      curs_addstr(3CURSES)

NAME
curs_addstr, addstr, addnstr, waddstr, waddnstr, mvaddstr, mvaddnstr, mvwaddstr, mvwaddnstr - add a string of characters to a curses window and advance cursor SYNOPSIS
cc [ flag ... ] file ... -lcurses [ library ... ] #include <curses.h> int addstr(char *str); int addnstr(char *str, int n); int waddstr(WINDOW *win, char *str); int waddnstr(WINDOW *win, char *str, int n); int mvaddstr(int y, int x, char *str); int mvaddnstr(int y, int x, char *str, int n); int mvwaddstr(WINDOW *win, int y, int x, char *str); int mvwaddnstr(WINDOW *win, int y, int x, char *str, int n); DESCRIPTION
All of these routines write all the characters of the null terminated character string str on the given window. It is similar to calling waddch() once for each character in the string. The four routines with n as the last argument write at most n characters. If n is negative, then the entire string will be added. RETURN VALUES
All routines return the integer ERR upon failure and an integer value other than ERR upon successful completion. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
curs_addch(3CURSES), curses(3CURSES), attributes(5) NOTES
The header <curses.h> automatically includes the headers <stdio.h> and <unctrl.h>. Note that all routines except waddstr() and waddnstr() may not be macros. SunOS 5.11 31 Dec 1996 curs_addstr(3CURSES)
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