omit white spaces for pattern matching in shell script

bharatbsharma · 09-18-2008, 06:09 AM

Hello

In shell script i am searching for a pattern like this

----------------------------------
value={ip = 10.10.10.10 }

if [[ $value == {ip* ]]
-----------------------------------

but if i have n no. of white spaces between "{" and "ip"

for example

value={ ip = 10.10.10.10 }

my pattern matching does not work.

How do i have have a general pattern matching in which i can have n no. of white spaces or no white spaces between "{" and "ip"?

Can somebody help me?

matthewg42 · 09-18-2008, 06:31 AM

To match spaces, use quotes:

Code:

if [[ "aa" == " aa" ]]; then 
  echo match
else 
  echo no match
fi

Should output "no match" because of the leading space on the second operand. You can still use variables, e.g.

Code:

v=" aa"
if [[ "$v" == " aa" ]]; then 
  echo match
else 
  echo no match
fi

Should output "match".

chrism01 · 09-18-2008, 07:43 PM

Do you really need to match on the '{' as well ?
Try a regex: http://www.tldp.org/LDP/abs/html/bas...#REGEXMATCHREF

ghostdog74 · 09-18-2008, 07:50 PM

you can use simple case/esac

Code:

# s="value={ip = 10.10.10.10 }"
# case $s in
> value={*ip* ) echo $s;;
> esac
value={ip = 10.10.10.10 }
# s="value={ ip = 10.10.10.10 }"
# case $s in  value={*ip* ) echo $s;; esac
value={ ip = 10.10.10.10 }

pixellany · 09-18-2008, 08:25 PM

To match on particular characters separated by any number of "whitespace" bytes:

abc[[:space:]]*def

matches all of the following:

Code:

abcdef
abc def
abc  def
abc   def

The whitespace can be tabs or spaces