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Full Discussion: find and replace and keep
Top Forums Shell Programming and Scripting find and replace and keep Post 302303780 by dariyoosh on Friday 3rd of April 2009 12:17:02 PM
Old 04-03-2009
Quote:
Originally Posted by Celvin VK
Hi All

I've file in which has these lines in it

create fil23456 read on 3345
create fil23456_1 read on 34567
create fil23456_2 read on 36789

I'm trying to replace the lines in such a way that in the end the file will look like

create fil23456 read on 3345
alter fil23456 read on 34567
alter fil23456 read on 36789

I would like to replace the occurrences of _1, _2 (this can be many so i cant hardcode saying _1 and _2)

I tried some of the sed, but couldnt succed (it is removing _ but not the 1s and 2s, then other one is reomving everything before _)

Can someone please help.

Hello there,

I think that the following KornShell script does the job

Code:
#!/bin/ksh

function substring
{
    TOKEN=$1
    LENGTH=${#TOKEN}
    COUNTER=0
    typeset -L1 CURRENT_CHARACTER
    RESULT=""
    
    while (( COUNTER < LENGTH ))
    do
        CURRENT_CHARACTER=$TOKEN
        if [[ $CURRENT_CHARACTER = "_" ]]
        then
            if (( (COUNTER + 1) < LENGTH ))
            then
                if [[ ${TOKEN#?} = [0-9] ]]
                then
                    print "$RESULT"
                fi
            else
                RESULT="$RESULT$CURRENT_CHARACTER"
            fi
        else
            RESULT="$RESULT$CURRENT_CHARACTER"
        fi
        (( COUNTER = COUNTER + 1 ))
        TOKEN=${TOKEN#?}
    done
}

INPUT_FILE=$1
OUTPUT_FILE=$1_temp

if [[ -a $OUTPUT_FILE ]]
then
    rm $OUTPUT_FILE
fi

cat $INPUT_FILE > $OUTPUT_FILE


while read LINE
do
    for TOKEN in $LINE
    do
        if [[ $TOKEN = *_[0-9] ]]
        then
            print -n "$(substring $TOKEN) "
        else
            print -n "$TOKEN "
        fi
    done
    print ""
done < $INPUT_FILE > $OUTPUT_FILE


I tested it with the following input file:

Code:
create fil23456 read on 3345
create fil23456_1 read on 34567
create fil23456_2 read on 36789
create fil11111_ read on 36789
create fil22222_5 read on 36789

Which provided the following putput

Code:
create fil23456 read on 3345 
create fil23456 read on 34567 
create fil23456 read on 36789 
create fil11111_ read on 36789 
create fil22222 read on 36789


Regards,
Smilie
 

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LEARN ABOUT POSIX

ip-token

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

NAME

       ip-token - tokenized interface identifier support

SYNOPSIS

       ip token { COMMAND | help }

       ip token set TOKEN dev DEV

       ip token del dev DEV

       ip token get [ dev DEV ]

       ip token [ list ]

DESCRIPTION

       IPv6 tokenized interface identifier 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.

       TOKEN  the interface identifier token address.

       dev DEV
	      the networking interface.

   ip token del - delete an interface token
       delete the interface token from the kernel.

       dev DEV
	      the networking interface.

   ip token get - get the interface token from the kernel
       show a tokenized interface identifier 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 identifiers 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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