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how to check if a string consist of any space?

 
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Top Forums UNIX for Dummies Questions & Answers how to check if a string consist of any space?
# 8  
Old 07-30-2008
test -z $username expands to test -z a b which is a syntax error, because test -z only expects one argument. By adding double quotes, like test -z "$username", the expansion becomes test -z "a b" which has only a single, double-quoted argument. That will fix the syntax error.

However, test -z only checks for an empty string, but will treat a string with characters in it (even if they are blanks) as non-empty. I would recommend that you try the case approach instead. If it doesn't work, perhaps you can follow up here.

Not to sound too harsh, but I already explained this in https://www.unix.com/unix-dummies-que...#post302219402
 
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LEARN ABOUT OPENDARWIN

tcl_getint

Tcl_GetInt(3)						      Tcl Library Procedures						     Tcl_GetInt(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_GetInt, Tcl_GetDouble, Tcl_GetBoolean - convert from string to integer, double, or boolean

SYNOPSIS

       #include <tcl.h>

       int
       Tcl_GetInt(interp, string, intPtr)

       int
       Tcl_GetDouble(interp, string, doublePtr)

       int
       Tcl_GetBoolean(interp, string, boolPtr)

ARGUMENTS

       Tcl_Interp   *interp	 (in)	   Interpreter to use for error reporting.

       CONST char   *string	 (in)	   Textual value to be converted.

       int	    *intPtr	 (out)	   Points to place to store integer value converted from string.

       double	    *doublePtr	 (out)	   Points to place to store double-precision floating-point value converted from string.

       int	    *boolPtr	 (out)	   Points to place to store boolean value (0 or 1) converted from string.
_________________________________________________________________

DESCRIPTION

       These  procedures  convert  from  strings  to integers or double-precision floating-point values or booleans (represented as 0- or 1-valued
       integers).  Each of the procedures takes a string argument, converts it to an internal form of a particular type, and stores the  converted
       value  at  the  location  indicated by the procedure's third argument.  If all goes well, each of the procedures returns TCL_OK.  If string
       doesn't have the proper syntax for the desired type then TCL_ERROR is returned, an error message is left in the interpreter's  result,  and
       nothing is stored at *intPtr or *doublePtr or *boolPtr.

       Tcl_GetInt  expects  string to consist of a collection of integer digits, optionally signed and optionally preceded by white space.  If the
       first two characters of string are ``0x'' then string is expected to be in hexadecimal form;  otherwise, if the first character	of  string
       is ``0'' then string is expected to be in octal form;  otherwise, string is expected to be in decimal form.

       Tcl_GetDouble  expects  string  to  consist  of	a floating-point number, which is:  white space;  a sign; a sequence of digits;  a decimal
       point;  a sequence of digits;  the letter ``e'';  and a signed decimal exponent.  Any of the fields may be omitted, except that the  digits
       either before or after the decimal point must be present and if the ``e'' is present then it must be followed by the exponent number.

       Tcl_GetBoolean  expects	string	to  specify  a boolean value.  If string is any of 0, false, no, or off, then Tcl_GetBoolean stores a zero
       value at *boolPtr.  If string is any of 1, true, yes, or on, then 1 is stored at *boolPtr.  Any of these values	may  be  abbreviated,  and
       upper-case spellings are also acceptable.

KEYWORDS

       boolean, conversion, double, floating-point, integer

Tcl																     Tcl_GetInt(3)