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Full Discussion: Counting number of single quotes in a string
Top Forums Shell Programming and Scripting Counting number of single quotes in a string Post 302931175 by bakunin on Sunday 11th of January 2015 12:00:54 PM
Old 01-11-2015
Quote:
Originally Posted by wisecracker
Longhand using builtins only and no pipes:-
(OSX 10.7.5 default bash terminal.)
Code:
	subtext=$(printf "%02X" "'${txt:$char:1}")

I hate to bring the bad news but this is a subshell, not a builtin. This way your script takes perhaps eons more than any single pipeline (which is pretty similar to a subshell call).

Your idea can be realized using builtins only, like this (the following uses ksh88, but should work in bash the same way):

Code:
#! /bin/ksh

typeset chString="\"description\":\"DevOps- Test VM\'s, System Admins Test VM\'s \""
typeset chBuffer=""
typeset chRemainder
typeset -i iCnt=0

while [ -n "$chString" ] ; do
     chRemainder="${chString#?}"               # "abc" -> "bc"
     chBuffer="${chString%${chRemainder}}"     # "abc" -> "a"
     chString="$chRemainder"                   # "abc" -> "bc"

     if [ "$chBuffer" == "'" ] ; then
          (( iCnt += 1 ))                      # in bash use (( iCnt++ ))
     fi
done

echo "$iCnt"

exit 0

I hope this helps.

bakunin
These 2 Users Gave Thanks to bakunin For This Post:
jim mcnamara wisecracker
 

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LEARN ABOUT V7

let

let(1)                                                             User Commands                                                            let(1)

NAME

       let - shell built-in function to evaluate one or more arithmetic expressions

SYNOPSIS

   ksh
       let arg...

DESCRIPTION

   ksh
       Each arg is a separate "arithmetic expression" to be evaluated.

EXIT STATUS

       The following exit values are returned:

       0        The value of the last expression is non-zero.

       1        The value of the last expression is zero.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), set(1), typeset(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                             let(1)
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