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finding the last substring...

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# 1  
Old 11-03-2006
finding the last substring...
hii,
i want to know the shell command for finding the last occurance of a substring in string..
i can use grep command or sed to find out the occurance of a substring in a string but how do i find out the last occurance.shud i use grep amd and cut the string everytime and store it in a new variable until i get null for the grep..?

Thanks!
# 2  
Old 11-03-2006
One way :
Code:
STRING="aaa;bbb;ccc"
SUBSTRING=';'
last_position=$(echo "$STRING" | awk -v str=$SUBSTRING '
   {
      while (match(substr($0, pos+1), str)) pos += RSTART;
      print pos;
      exit;
   } ')


Jean-Pierre.
# 3  
Old 11-03-2006
This code doesnot work...itz giving me the following error..
STRING="aaa;bbb;ccc"
SUBSTRING=';'
last_position=$(echo "$STRING" | awk -v str=$SUBSTRING '
{
while (match(substr($0, pos+1), str)) pos += RSTART;
print pos;
exit;
} ')

Errors:
awk: syntax error near line 1
awk: bailing out near line 1
# 4  
Old 11-03-2006
Try with nawk instead of awk.


Jean-Pierre.
# 5  
Old 11-03-2006
even this doesnot work...i had previously written similarly..it doesnot work...
# 6  
Old 11-04-2006
Does thie help ?
Code:
STRING="aaa;bbb;ccc"
SUBSTRING=';'
echo ${STRING##*$SUBSTRING}

# 7  
Old 11-04-2006
This is what you are looking for

use this command

Code:
awk '{print $NF}' file_name

Thanks
srikanth
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