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Full Discussion: delete spaces in the variable in unix script?
Top Forums Shell Programming and Scripting delete spaces in the variable in unix script? Post 302103194 by Perderabo on Wednesday 17th of January 2007 02:35:52 AM
Old 01-17-2007
Quote:
Originally Posted by tayyabq8
With bash or ksh93:
Code:
$var="Test String"
$var=${var/ /}
$echo $var
TestString

That syntax only removes one space. But you could loop:
Code:
bash-3.00$ v="one two three"
bash-3.00$ v=${v/ /}
bash-3.00$ echo $v
onetwo three
bash-3.00$ v="one two three"
bash-3.00$ while [[ $v == *\ * ]] ; do v=${v/ /} ; done
bash-3.00$ echo $v
onetwothree
bash-3.00$

In any version of ksh you can use some ugly syntax to remove the first or last space. And again you can loop to remove all spaces...
Code:
$ v="one two three"
$ v=${v%${v##+([! ])}}${v#${v%${v##+([! ])}} }
$ echo $v
onetwo three
$ v="one two three"
$ v=${v% ${v#${v%%+([! ])}}}${v#${v%%+([! ])}}
$ echo $v
one twothree
$
$
$ v="one two three"
$ while [[ $v == *\ * ]] ; do v=${v%${v##+([! ])}}${v#${v%${v##+([! ])}} } ; done
$ echo $v
onetwothree
$

 

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LEARN ABOUT X11R4

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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