case-insensitive search with AWK

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# 8  
Old 09-03-2009
Originally Posted by sam25
so how we can make a case-insensitive search for below command

awk '/str1/ && /str2/ && /str3/' filename
just like I outlined above.......
awk 'tolower(str1) ~ tolower($0)' filename

# 9  
Old 09-03-2009
thnx vgersh99

Here is the complete problem.

i want to perform logical AND operation for search. i am passing a space separated string to a variable from web application.

below is my code

KEY="space separated string from web application"
KEY1=`echo $KEY|sed -e 's/ /\/ \&\& \//g'`
awk "/$KEY1/" filename

it is working but not case insensitive.
Any help would be appreciated.


Last edited by vgersh99; 09-03-2009 at 04:31 PM.. Reason: code tags, PLEASE!
# 10  
Old 09-03-2009
If you are using GNU awk (gawk), set the IGNORECASE builtin variable to 1.

$ gawk 'BEGIN{print "ab" ~ /aB/}'
$ gawk 'BEGIN{IGNORECASE=1; print "ab" ~ /aB/}'

# 11  
Old 09-03-2009
no, you can not do it like this - there's no 'eval' in awk.

KEY="space separated string from web application"

nawk -v k="${KEY}" '
  BEGIN {n=split(k,kA)}
    { for(i=1;i<=n;i++) if (tolower($0) !~ tolower(kA[i])) next;print}' myFile.txt

# 12  
Old 09-03-2009
Thanks vgersh.

Its working..SmilieSmilie
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