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Remove box like special character from end of string

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Top Forums Shell Programming and Scripting Remove box like special character from end of string
# 8  
Old 02-02-2009
Quote:
Originally Posted by Qwerty123
Hi,

My requirement is that I store this string in suppose say $string...and compare it with a parameter that is input say $param ...
like

if [ $string = $param ]
then
echo 'True'
else
echo 'False'
fi

This $string is part of header (i.e another big string) which can be treated as a record (line) and this $string appears at the end of line. I fetch it based on positions...for ex: 30 to 60. In case the $string is of length 10 only, 11th character i.e, at position 41 there'll be this box like character (since I'm fetching 30 to 60 into $string). This character doesn't get trimmed. And since this box like character is present my comparision returns 'False' even when it's 'True'.

I have tried things like

string=`echo $string|tr -d '\n'`
and \t, \r, \222,\221---Ascii equivalents...and all that and then thought its not Ascii at all.

Still I couldn't solve this. Please helpSmilie
Well, read the file using:

Code:
sed -e 's/[^ -~]//g'

For sure, that'll remove the non-ascii boxes.
Then your comparisons will work.
# 9  
Old 02-02-2009
If you would like to send the 'string' (a variable) to the 'sed' you could use pipe from echo:
Code:
echo "$string"|sed -e 's/[^ -~]//g'

(although I am not sure what that sed-substitution does.)
# 10  
Old 02-02-2009
Quote:
Originally Posted by alex_5161
If you would like to send the 'string' (a variable) to the 'sed' you could use pipe from echo:
Code:
echo "$string"|sed -e 's/[^ -~]//g'

(although I am not sure what that sed-substitution does.)
the sed removes everything not in the range from blank to tilde.

blank is the first ASCII printable.... tilde is the last ASCII printable,
numerically speaking.
# 11  
Old 02-02-2009
I see, range from space to tilda. Thanks!
But what '^' is doing there?
I think there is no reason to specify the 'beginning of string'. Or there is some?
# 12  
Old 02-02-2009
Quote:
Originally Posted by alex_5161
I see, range from space to tilda. Thanks!
But what '^' is doing there?
I think there is no reason to specify the 'beginning of string'. Or there is some?
'man regexp'
Code:
     1.4   A non-empty string of characters  enclosed  in  square
           brackets  ([])  is a one-character RE that matches any
           one character in that string. If, however,  the  first
           character  of the string is a circumflex (^), the one-
           character RE matches any character except new-line and
           the remaining characters in the string. The ^ has this
           special meaning only if it occurs first in the string.
           The  minus (-) may be used to indicate a range of con-
           secutive characters; for example, [0-9] is  equivalent
           to  [0123456789].  The - loses this special meaning if
           it occurs first (after an initial ^, if any)  or  last
           in  the  string. The right square bracket (]) does not
           terminate such a string when it is the first character
           within  it  (after an initial ^, if any); for example,
           []a-f] matches either a right square  bracket  (])  or
           one  of  the  ASCII letters a through f inclusive. The
           four characters listed in 1.2.a above stand for  them-
           selves within such a string of characters.

# 13  
Old 02-02-2009
Quote:
Originally Posted by alex_5161
I see, range from space to tilda. Thanks!
But what '^' is doing there?
I think there is no reason to specify the 'beginning of string'. Or there is some?

When tilde is the first character inside of brackets,
it means "NOT in this range".
# 14  
Old 02-02-2009
Oh!! Right! - it is negotiation in brackets!
Sure!
Thanks!
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