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Full Discussion: awk : search last index in specific column
Top Forums Shell Programming and Scripting awk : search last index in specific column Post 302868951 by tarun.trehan on Tuesday 29th of October 2013 10:25:10 AM
Old 10-29-2013
awk : search last index in specific column
I am trying to search a given text in a file and find its last occurrence index. The task is to append the searched index in the same file but in a separate column. I am able to accomplish the task partially and looking for a solution.

Following is the detailed description:

names_file.txt
Code:
111|lkasjdfaaa|555|tarun trehan
111|aaa|55765|vikram batra
111|aaa|555|allzhere blog
65876111|aaa|555|allzhere android apps
111|hhhaaa|555|allzhere on facebook
111|aaa|555|contact updater utility
111|aaa|444555|help me

Assuming, i am trying to search last occurrence index of "n" in the name i.e. my last column of file. So, the output file should be as following where the last column is representing the last index of "n" in the name column:

Output File :
Code:
111|lkasjdfaaa|555|tarun trehan|12
65876111|aaa|555|allzhere android apps|11
111|hhhaaa|555|allzhere on facebook|11
111|aaa|555|contact updater utility|3

I tried the following command:

Code:
cat names_file.txt | awk -F"|" '{print $4}' | awk -F"n" 'NF>1{print $0"|"length($0) - length($NF)}'

It gives me the following results:
Code:
tarun trehan|12
allzhere android apps|11
allzhere on facebook|11
contact updater utility|3

How can i fetch the rest of the columns first awk and still scan the 4th column only. I want the desired output described above.
Last edited by vbe; 10-29-2013 at 11:28 AM.. Reason: code tags... also for data!
 

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LEARN ABOUT OSF1

hostid

hostid(1)						      General Commands Manual							 hostid(1)

NAME

       hostid - Sets or displays the identifier of the local host

SYNOPSIS

       /usr/sbin/hostid [hostname | hexadecimal_number | internet_address]

DESCRIPTION

       The  hostid  command displays the 32-bit identifier of the host as a hexadecimal number in host standard byte order. The identifier must be
       unique across all hosts and is commonly set to the Internet address of the specified host.  The superuser can set the host ID by specifying
       a hostname, internet_address, or hexadecimal_number argument.  The identifier is stored in network standard byte order.

EXAMPLES

       To display the identifier of the local host, enter: $ hostid

       0xc009c803

	      The  hostid  command displays the identifier of the host as a hexadecimal number in host standard byte order.  To set the identifier
	      of the local host to the local Internet address, enter: $ hostid 555.5.55.555

	      The hostid command converts the Internet address to its hexadecimal equivalent, and then sets the local host to this address.

	      Note that the sample Internet address in this example, 555.5.55.555, is not a valid Internet  address  and  would  cause	hostid	to
	      return an error.

SEE ALSO

       Commands:  hostname(1)

       Functions:  gethostid(2), sethostid(2)

																	 hostid(1)
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