need script to replace "/" with "\"

[Stephen Kennedy_2]

All

I need to do the following I need a script that will change /aaaa/bbbb/cccc to \aaaa\bbbb\ccccc I have tried sed 's///\/g' and awk FS = / OFS = \ any suggestions, I need to keep away from perl so is there an easy way to perform this.....

[Pete Randall]

Your sed solution would most likely be the easiest, but I think you were missing one "/". Try sed 's////\/g'.


Pete

[Roberto Polli]

Well your sed script miss the \ protection!!

sed 's/\//\\/g'

will work for you. If you use gnu-sed (the linux one) you can do it clearly using any character instead of \

eg sed 's|\/|\\|g'


Peace, R.

[H.Merijn Brand (procura]

# man tr


# tr '\\' /
Enjoy, Have FUN! H.Merijn

[G. Vrijhoeven]

Hi,

echo /aaaa/bbbb/cccc | sed 's%\/%\\%g'

HTH,

Gideon

[john korterman]

Hi,

# STRING="/aaaa/bbbb/cccc"
# echo "$STRING" | tr "[\057]" "[\134]"
\aaaa\bbbb\cccc

regards,
John K.

[H.Merijn Brand (procura]

Sorry backwards is evenly easy:

# tr / '\\'
See that perl is not always the best tool?

Enjoy, Have FUN! H.Merijn [ using the right tool for the right problem ]

[KapilRaj]

cat filename |sed -e "s;/;\;g" works in Korh SHell

Regds,

Kaps

[H.Merijn Brand (procura]

Kapil: no it doesn't:

a5:/u/usr/merijn 101 > ksh
$ echo /aaa/bbb/ccc | sed -e "s;/;\;g"
sed: -e expression #1, char 7: Unterminated `s' command
$

Enjoy, Have FUN! H.Merijn [ who thinks sed is not the right tool here ]

[G. Vrijhoeven]

Merijn,

prc60b03:/root # timex echo aa/ss | sed 's%\/%\\%g'

real 0.00
user 0.00
sys 0.00

aa\ss
prc60b03:/root # timex echo aa/ss | tr / '\\'

real 0.01
user 0.00
sys 0.00

aa\ss

Who is just curious about why exactly tr is the better tool over sed.

Gideon ( 0 points please )

[G. Vrijhoeven]

Merijn,

Just did the same with the a large file on a slow server and tr was faster. So i must admit your are right.

Gideon

[H.Merijn Brand (procura]

Humbug! Cache is your enemy here. Watch:

lt09:/home/merijn 182 > > test.txt
lt09:/home/merijn 183 > repeat 5000 echo /what/if/there/are/more/lines >> test.txt
lt09:/home/merijn 184 > time tr / '\\' /dev/null
0.001u 0.000s 0:00.00 0.0% 0+0k 0+0io 127pf+0w
lt09:/home/merijn 185 > time tr / '\\' < test.txt > /dev/null
0.000u 0.002s 0:00.00 0.0% 0+0k 0+0io 127pf+0w
lt09:/home/merijn 186 > time sed 's:/:\\:g' /dev/null
0.059u 0.001s 0:00.05 100.0% 0+0k 0+0io 142pf+0w
lt09:/home/merijn 187 > time sed 's:/:\\:g' < test.txt > /dev/null
0.060u 0.001s 0:00.06 100.0% 0+0k 0+0io 142pf+0w
lt09:/home/merijn 188 >

Plainly shows that tr is faster

Enjoy, Have FUN! H.Merijn

[Elmar P. Kolkman]

Other solution, and quite as fast as tr on large input:
awk '{gsub("/","\\");print}'

For the performance freaks, do it like this:
timex awk '{gsub("/","\\");print}' /tmp/tmpf

This gives better info as in Gideon's post, because in those you're only timing the echo or cat, not the command doing the substitions.

[Nicolas Dumeige]

(
To keep the substitute code clear and readable, use another symbol :
s@pattern@substitute@
rather than
s/pattern/substitute/
)

My 2 cents

[KapilRaj]

Merijn,

It works for me in AIX , just tried the same in BASH and KSH of Linux it gave me the same error !

That means there are diffrences in every Vendor's implementation of shells ?

Regds,

Kaps

[H.Merijn Brand (procura]

Kapil, you are serious with that question? :) :)

Of course there are. IBM think they are the only truth, and so do M$.

Standards = multiple versions of the truth

I'm not surprised at all. Try all machines in HP/Compaq's test park. And Solaris, Primos, FreeBSD, OS/2, ...
I et they all act different

Enjoy, Have FUN! H.Merijn [ whose job in the Perl community is to know about these differences ]

[KapilRaj]

Seriously ? Yes. I thought Korn shell is korn shell every where and so on with C

So that means if I have to migrate a script which I have on AIX to HPUX I would need to break by head looking at each shell command !!!

Thanks alot.

Regds,

Kaps

[Elmar P. Kolkman]

And to make matters worse, take a look at tools like awk, which are not even compatible across OS's (use nawk on Solaris, to make it compatible with awk on HP-UX, for instance).

[Nicolas Dumeige]

Kapil,

To get the ksh to print his revision number, try [ESC] then [CTRL]V .

Version M-12/28/93d

Cheers,

Nicolas

[Nicolas Dumeige]

On Linux or other free unix like implementation wich use pdksh (public domain ksh), there is one very odd difference.

If you type :
echo value | read var
var will be empty, no value has been assigned to it.

[Keith Bevan_1]

Stephen,

Problems can arise with the '/' as sed will treat this as a seperator in your sed statement.

Change the '/' to a ',' :-

sed ,/,\,g


Keith

[Sathish C]

Hi
The easiest is via the most powerfull editior vi ,

vi the file you wanna change
in the Esc mode

:%s/\/..../\\..../g

....=> can be the length of the string you wanna replace .