Shell Variables passed to awk to return certain rows
Hi Forum.
I have the following test.txt file and need to extract certain rows based on "starting position", "length of string" and "string to search for":
Code:
1a2b3d
2a3c4d
.....
My script accepts 3 parameters: (starting col pos, length to search for, string to search for) and would like to pass these parameters for awk to extract the records.
Running the script as:
Code:
script 2 3 a2b test.txt
would return the first record from the file:
Code:
1a2b3d
Code:
awk -v search_col_pos=$search_col_pos search_str_len=$search_str_len string_to_search=$string_to_search 'substr($0, search_col_pos, search_str_len) == "string_to_search"' test.txt
where $search_col_pos, $search_str_len, $string_to_search are passed as input parameters to the script.
but code is not working and is returning the following error:
Code:
awk: fatal: cannot open file
Please help.
Thanks.
Moderator's Comments:
Please use CODE tags for all sample input, sample output, and sample code segments.
Last edited by Don Cragun; 06-29-2015 at 07:04 PM..
Reason: Add CODE tags.
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06-29-2015
