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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 MOJAVE

tabify

textutil::tabify(n)				    Text and string utilities, macro processing 			       textutil::tabify(n)

__________________________________________________________________________________________________________________________________________________

NAME

       textutil::tabify - Procedures to (un)tabify strings

SYNOPSIS

       package require Tcl  8.2

       package require textutil::tabify  ?0.7?

       ::textutil::tabify::tabify string ?num?

       ::textutil::tabify::tabify2 string ?num?

       ::textutil::tabify::untabify string ?num?

       ::textutil::tabify::untabify2 string ?num?

_________________________________________________________________

DESCRIPTION

       The package textutil::tabify provides commands that convert between tabulation and ordinary whitespace in strings.

       The complete set of procedures is described below.

       ::textutil::tabify::tabify string ?num?
	      Tabify  the string by replacing any substring of num space chars by a tabulation and return the result as a new string. num defaults
	      to 8.

       ::textutil::tabify::tabify2 string ?num?
	      Similar to ::textutil::tabify this command tabifies the string and returns the result as a new string. A different algorithm is used
	      however. Instead of replacing any substring of num spaces this command works more like an editor. num defaults to 8.

	      Each line of the text in string is treated as if there are tabstops every num columns. Only sequences of space characters containing
	      more than one space character and found immediately before a tabstop are replaced with tabs.

       ::textutil::tabify::untabify string ?num?
	      Untabify the string by replacing any tabulation char by a substring of num space chars and return the result as a  new  string.  num
	      defaults to 8.

       ::textutil::tabify::untabify2 string ?num?
	      Untabify	the  string  by  replacing  any  tabulation  char by a substring of at most num space chars and return the result as a new
	      string. Unlike textutil::tabify::untabify each tab is not replaced by a fixed number of space characters.  The command overlays each
	      line  in	the  string  with tabstops every num columns instead and replaces tabs with just enough space characters to reach the next
	      tabstop. This is the complement of the actions taken by ::textutil::tabify::tabify2. num defaults to 8.

	      There is one asymmetry though: A tab can be replaced with a single space, but not the other way around.

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category textutil
       of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

SEE ALSO

       regexp(n), split(n), string(n)

KEYWORDS

       formatting, string, tabstops

CATEGORY

       Text processing

textutil								0.7						       textutil::tabify(n)