sed replacement, challenge one!!!!

summer_cherry · #1 (**permalink**) 04-07-2008

Hi all,

Thanks in advanced.

This question really bothered me much. What i want is to replace any times of repeated 'TB' to 'T', below is example.
It can be fullfil by AWK and perl, but my desire is using SED to realize it.

So here means we treat TB as a whole part, which means 's/TB*/T/' and
's/[TB]*/t/' can not fullfill it.

Code:

aTBb              -> aTb
aTBTBc           -> aTc
aTBTBTBd        -> aTd
aTBTTBTBe      -> aTBTTBTBe

fpmurphy · #2 (**permalink**) 04-07-2008

Maybe it is too early in the morning but what is different about the last line i.e. 'aTBTTBTBe' ? It has the pattern 'TB' in it. Surely it should change to 'aTTTe"

V3l0 · #3 (**permalink**) 04-07-2008

Try this:
File atd

Code:

#!/bin/ksh

for i in $*
do
        z=$(echo $i | grep TT)
        if [ x"$z" = x ]
        then
                z=$(echo $i | sed -e 's/TB/T/g')
                while [ 1 ]
                do
                        z=$(echo $z | sed -e 's/TT/T/g')
                        if [ x"$(echo $z | grep TT)" = x ]
                        then
                                break
                        fi
                done
                echo $i/$z
        else
                echo $i/$i
        fi
done

Run it:

Code:

./atd aTBb aTBTBc aTBTBTBd aTBTTBTe
aTBb/aTb
aTBTBc/aTc
aTBTBTBd/aTd
aTBTTBTe/aTBTTBTe

chella · #4 (**permalink**) 04-07-2008

Hi,

How about the below one,

Code:

sed 's/TT/#T#T/g;s/BB/#B#B/g;/#/!s/TB.*TB/T/g;/#/!s/TB/T/g;s/#//g' inp.txt

does it help?

Regards,
Chella

V3l0 · #5 (**permalink**) 04-07-2008

NICE !!!

Quote:

Originally Posted by chella

Hi,

How about the below one,

Code:

sed 's/TT/#T#T/g;s/BB/#B#B/g;/#/!s/TB.*TB/T/g;/#/!s/TB/T/g;s/#//g' inp.txt

does it help?

Regards,
Chella

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
sed xml challenge	katrvu	Shell Programming and Scripting	2	04-10-2008 07:50 PM
AWK Challenge	netmedic	Shell Programming and Scripting	9	02-18-2008 04:08 AM
camma challenge (in ksh)	Amresh Dubey	Shell Programming and Scripting	3	10-31-2007 05:10 AM
A challenge for you sed/awk wizards...	th3g0bl1n	UNIX for Dummies Questions & Answers	2	10-24-2007 10:37 AM
safeword challenge	blowtorch	UNIX for Advanced & Expert Users	2	10-10-2006 10:44 PM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by