sed - searching token in certain order Post: 302854079

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Top Forums Shell Programming and Scripting sed - searching token in certain order Post 302854079 by jcdole on Monday 16th of September 2013 05:30:59 PM

09-16-2013

Registered User

My last post show what I have tried before I post my question.

And the pseudo code show exactly the problem:
1�) There is one parameter ($1) for the file name : "/root/Documents/file_text.txt" in the example
2�) There is one parameter ($2) for the first token : "In the Linux startup process" in the example
So we can ignore the begin of the text file
3�) There is one parameter ($3) for the second token : "Like init"
So we can search safely from this second token because we are protected by the first token and because we know that the second token appear only once after the first token. So we can ignore all the text until this second token after having found the first token.
4�) There is one parameter ($5) for the last token : "ways" in the example
So we stop searching beyond this token.
As I have no idea how to pass the character " \ " or " } " or " ' " or " . " as token, I have make my test with a single word.
5�) There is one parameter ($4) for the token to search for : "manage" in the example.
This token could start at the very beginning of a line, after a blank or after a tab ( some thing like [ ^ | \t | ]).
As I don't know how to represent this ORed expression, I give my example with a simple word.

As you can see, my pseudo code is unchanged.

What I would like is :
1�) make simpler

Code:

my_function () {
CMD="COUNT=\$(sed -n '/^$1/,\$p'  $2 | sed -n '/^$3/,\$p' | sed '/$5/ q'  | sed -n '1p' | grep -c '$4'   )"
eval $CMD
if [[ $COUNT -gt 0 ]] ; then
    return 0
else
    return 1
fi
}

2�) how to pass a \, a }, a ' as $5
3�) how to pass [^ | \t | space ]token_to_pass as $4

jcdole

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LEARN ABOUT CENTOS

ip-token

IP-TOKEN(8)							       Linux							       IP-TOKEN(8)

NAME

       ip-token - tokenized interface identifer support

SYNOPSIS

       ip token  { COMMAND | help }

       ip token { set } TOKEN dev DEV

       ip token { get } dev DEV

       ip token { list }

DESCRIPTION

       IPv6 tokenized interface identifer support is used for assigning well-known host-part addresses to nodes whilst still obtaining a global
       network prefix from Router advertisements. The primary target for tokenized identifiers are server platforms where addresses are usually
       manually configured, rather than using DHCPv6 or SLAAC. By using tokenized identifiers, hosts can still determine their network prefix by
       use of SLAAC, but more readily be automatically renumbered should their network prefix change [1]. Tokenized IPv6 Identifiers are described
       in the draft [1]: <draft-chown-6man-tokenised-ipv6-identifiers-02>.

   ip token set - set an interface token
       set the interface token to the kernel. Once a token is set, it cannot be removed from the interface, only overwritten.

       TOKEN  the interface identifer token address.

       dev DEV
	      the networking interface.

   ip token get - get the interface token from the kernel
       show a tokenized interface identifer of a particular networking device.	Arguments: coincide with the arguments of ip token set but the
       TOKEN must be left out.

   ip token list - list all interface tokens
       list all tokenized interface identifers for the networking interfaces from the kernel.

SEE ALSO

       ip(8)

AUTHOR

       Manpage by Daniel Borkmann

iproute2							    28 Mar 2013 						       IP-TOKEN(8)

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