Using grep to check for character at fixed position


 
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# 1  
Using grep to check for character at fixed position

i have a file (test.txt) that contains:

Code:
20799510617900000928000000005403020110315V
20799510617900000928000000005403020110316
20799510617900000928000000005403020110317
20799510617900000928000000005403020110318V

Code:
grep V test.txt > /tmp/void.log

if [ -s /tmp/void.log ]
then
     mail -s "void" < test.txt
fi



V is sitting at position 42. how can i grep a blank space at position 42 ?

Last edited by pludi; 03-31-2011 at 12:31 PM.. Reason: title, code tags
# 2  
try this

Code:
 
grep "^.\{41\} " filename

# 3  
Code:
$ ruby -ne 'puts $_ if $_[41].chomp==""' file

 

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