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Full Discussion: Reversing and trim a String through SHELL script
Top Forums Shell Programming and Scripting Reversing and trim a String through SHELL script Post 84530 by vino on Tuesday 27th of September 2005 12:48:17 AM
Old 09-27-2005
Use the search facility.

Here is a result - transposing letters.

It talks about the command rev. It should do the reversing for you.

If rev is not available on your machine try this script below.

Code:
[~/temp]$ cat deepak.sh 
#! /bin/sh

# reverse a string

[[ -z "$@" ]] && STR=" a b c d e f g h i j k l m n o p q r s t u v w x y z " || STR="$@"

len=${#STR}

REV=""
for (( i=$len ; i>0 ; i-- ))
do
        REV=$REV""${STR:$i-1:$i}
        STR=${STR%${STR:$i-1:$i}}
done

echo "Reversed string"
echo $REV

Code:
[~/temp]$ ./deepak.sh
Reversed string
z y x w v u t s r q p o n m l k j i h g f e d c b a

As for trimming, you can trim the leading and trailing white spaces.

Use this constuct within the script.

Code:
# remove leading white spaces
REV=${REV## }
# remove trailing white spaces
REV=${REV%% }

vino
 

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mac::types

Types(3)						User Contributed Perl Documentation						  Types(3)

NAME

       Mac::Types - Macintosh Toolbox Types and conversions.

DESCRIPTION

       Access to Inside Macintosh is essential for proper use of these functions.  Explanations of terms, processes and procedures are provided
       there.  Any attempt to use these functions without guidance can cause severe errors in your machine, including corruption of data. You have
       been warned.

   Functions
       MacPack [ CONVERTERS ...] CODE, DATA ...
	   Convert a perl value into a Mac toolbox type. Predefined codes are:

	   TEXT
	       Text (an identity operation).

	   enum
	   type
	   keyw
	       A 4-byte string.

	   bool
	       A boolean.

	   shor
	       A short integer.

	   long
	       A long integer.

	   sing
	       A single precision float.

	   doub
	       A double precision float.

	   magn
	       An unsigned long.

	   qdrt
	       A QuickDraw "Rect".

	   'STR '
	       A pascal style string.

	   'STR#'
	       A string list.

	   'fss '
	       A file specification record.

	   You can pass further code mappings as hash references.

       MacUnpack [ CONVERTERS ...] CODE, DATA
	   Convert a Mac toolbox type into a perl value. Predefined codes are as for "MacPack". You can pass further code mappings as hash
	   references.

   XS Functions
       Debugger [ MSG ]
	   Break into MacsBug. Don't use this if you don't know what MacsBug is.

AUTHOR

       Written by Matthias Ulrich Neeracher <neeracher@mac.com>.  Currently maintained by Chris Nandor <pudge@pobox.com>.

perl v5.18.2							    2017-10-06								  Types(3)
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