So I have a file containing data of a marathon. Here's an example what it looks like including the given key:
Code:
# key: sex, time, athlete, athlete's nationality, date, city, country
M, 2:30:57.6, Harry Payne, GBR, 1929-07-05, Stamford Bridge, England
M, 2:5:42, Khalid Khannouchi, MAR, 1999-10-24, Chicago, USA
M, 2:5:37.8, Khalid Khannouchi, USA, 2002-04-14, London, USA
My task is to extract all lines that feature a runner's last name starting with a C.
What I did was; I sorted the file according to key 4 and redirected the output to a new file, which gave me the list sorted in alphabetical order according to their last name. I used this command to do this;
Code:
sort -k 4 marathon > t21a
.
Does anyone know if there is a command that allows me to grep all entries which have the last name starting with C from the key position these terms are in?
Any help would be much appreciated.
I have tried to grep from a key position but the option I used(from sort) does not exist for grep;
Code:
grep -k 4 '^[C,c]' t21b > t21c
Thank you
Last edited by Scrutinizer; 05-21-2018 at 08:59 AM..
Reason: code tags
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LEARN ABOUT DEBIAN
ldns_key_list_key_count
ldns(3) Library Functions Manual ldns(3)NAME
ldns_key_list_key_count, ldns_key_list_key, ldns_key_rsa_key, ldns_key_dsa_key, ldns_key_algorithm, ldns_key_hmac_key, ldns_key_origttl,
ldns_key_inception, ldns_key_expiration, ldns_key_keytag, ldns_key_pubkey_owner, ldns_key_flags-
SYNOPSIS
#include <stdint.h>
#include <stdbool.h>
#include <ldns/ldns.h>
size_t ldns_key_list_key_count(const ldns_key_list *key_list);
ldns_key* ldns_key_list_key(const ldns_key_list *key, size_t nr);
RSA* ldns_key_rsa_key(const ldns_key *k);
DSA* ldns_key_dsa_key(const ldns_key *k);
ldns_signing_algorithm ldns_key_algorithm(const ldns_key *k);
unsigned char* ldns_key_hmac_key(const ldns_key *k);
uint32_t ldns_key_origttl(const ldns_key *k);
uint32_t ldns_key_inception(const ldns_key *k);
uint32_t ldns_key_expiration(const ldns_key *k);
uint16_t ldns_key_keytag(const ldns_key *k);
ldns_rdf* ldns_key_pubkey_owner(const ldns_key *k);
uint16_t ldns_key_flags(const ldns_key *k);
DESCRIPTION
ldns_key_list_key_count() returns the number of keys in the key list
key_list: the key_list
Returns the numbers of keys in the list
ldns_key_list_key() returns a pointer to the key in the list at the given position
key: the key
nr: the position in the list
Returns the key
ldns_key_rsa_key() returns the (openssl) RSA struct contained in the key
k: the key to look in
Returns the RSA * structure in the key
ldns_key_dsa_key() returns the (openssl) DSA struct contained in the key
ldns_key_algorithm() return the signing alg of the key
k: the key
Returns the algorithm
ldns_key_hmac_key() return the hmac key data
k: the key
Returns the hmac key data
ldns_key_origttl() return the original ttl of the key
k: the key
Returns the original ttl
ldns_key_inception() return the key's inception date
k: the key
Returns the inception date
ldns_key_expiration() return the key's expiration date
k: the key
Returns the experiration date
ldns_key_keytag() return the keytag
k: the key
Returns the keytag
ldns_key_pubkey_owner() return the public key's owner
k: the key
Returns the owner
ldns_key_flags() return the flag of the key
k: the key
Returns the flag
AUTHOR
The ldns team at NLnet Labs. Which consists out of Jelte Jansen and Miek Gieben.
REPORTING BUGS
Please report bugs to ldns-team@nlnetlabs.nl or in our bugzilla at http://www.nlnetlabs.nl/bugs/index.html
COPYRIGHT
Copyright (c) 2004 - 2006 NLnet Labs.
Licensed under the BSD License. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
SEE ALSO
ldns_key. And perldoc Net::DNS, RFC1034, RFC1035, RFC4033, RFC4034 and RFC4035.
REMARKS
This manpage was automaticly generated from the ldns source code by use of Doxygen and some perl.
30 May 2006 ldns(3)
05-21-2018
Grep a pattern in a key position a file
