need a script!

rgistered · 11-06-2007, 12:19 AM

greetings, i need a script which can automatically does the following and yes this script exists:

"anything anything anything to anything\ anything\ anything"

like i want to add " \ " whenever there is space.

hope am clear in explaining my point.
Thx

checkmate3001 · 11-06-2007, 12:28 AM

This sounds like homework.

rgistered · 11-06-2007, 12:32 AM

hmmmmm, am here for help. If you can plz as am new to linux.
thx

syg00 · 11-06-2007, 12:47 AM

"man sed" ...

frenchn00b · 11-06-2007, 01:09 AM

http://www.grymoire.com/Unix/Awk.html

kind of working one:

Code:

cat myfile | awk '  { gsub("/","whateveriwant") ; print $0 }'

Simon Bridge · 11-06-2007, 03:09 AM

checkmate3001 comments: "This sounds like homework."
rgistered replies, "hmmmmm, am here for help."
... that's not a denial man.
I suggest you look over your course-notes again.

If this is not homework, you can prove it by telling us the purpose of the script. What does this task achieve that is useful to you?

Note: this is "help". It won't help anyone if we do your homework for you. Encouraging (forcing) you to do your own homework is the best help we can offer. OTOH: you could show that you have genuinely tried... show the reasoning you have used... then, perhaps we can tell you where you are going wrong. That way you learn more, see.

arub · 11-06-2007, 04:05 AM

try this.
if u want to have the \ before any character place it between that "[" and "]" in the following command

------------------------------------------------------------------

echo "anything anything anything to anything\ anything\ anything" |sed 's/[\ ]/\\\0 /g'

-------------------------------------------------------------------

now i am placing \ before two character's
first is : \
second id: SPACE

frenchn00b · 11-06-2007, 04:22 PM

Quote:

Originally Posted by Simon Bridge

checkmate3001 comments: "This sounds like homework."
rgistered replies, "hmmmmm, am here for help."
... that's not a denial man.
I suggest you look over your course-notes again.

If this is not homework, you can prove it by telling us the purpose of the script. What does this task achieve that is useful to you?

Note: this is "help". It won't help anyone if we do your homework for you. Encouraging (forcing) you to do your own homework is the best help we can offer. OTOH: you could show that you have genuinely tried... show the reasoning you have used... then, perhaps we can tell you where you are going wrong. That way you learn more, see.

It might be.
awk is my favourite, put down the code, we can correct/fix it.

( Good luck with sed, I never understood anything after one year with all the bar stuffs. )

ghostdog74 · 11-06-2007, 05:24 PM

Quote:

Originally Posted by frenchn00b

http://www.grymoire.com/Unix/Awk.html

kind of working one:

Code:

cat myfile | awk '  { gsub("/","whateveriwant") ; print $0 }'

No need cat

Code:

 awk '{ gsub("/","whateveriwant");print}' myfile

archtoad6 · 12-19-2007, 02:33 PM

If using sed,

Code:

echo "anything anything anything"  | sed 's, ,\\ ,g'

would be a cleaner, prettier, & more accurate solution to the stated problem.

RT

M sed

unSpawn · 12-19-2007, 05:16 PM

No sed, no awk, no cat with 's="anything anything anything"; echo "${s// /\\ }"'

archtoad6 · 12-20-2007, 07:51 AM

Elegant, ticks me off that it slipped my mind. Tnx for the reminder.
How well does it scale up -- i.e. process a whole file?

Simon Bridge · 12-20-2007, 11:02 PM

"Remember Alexander -- you don't have to untie the knot to solve the puzzle."
... though it does help if you have the worlds largest standing army outside...

Alexander: There, it's untied.
Official: Um, that's sort of, cheati...
Alexander: Look out that window would you...
Official: But a brilliant workaround anyway, Sire!

What happened to OP?

ghostdog74 · 12-21-2007, 12:28 AM

Quote:

Originally Posted by archtoad6

Elegant, ticks me off that it slipped my mind. Tnx for the reminder.
How well does it scale up -- i.e. process a whole file?

Code:

 # head -10 file
anything anything anything
anything anything anything
anything anything anything
anything anything anything
anything anything anything
anything anything anything
anything anything anything
anything anything anything
anything anything anything
anything anything anything
# wc -l file
1000000 file
# time sed 's, ,\\ ,g' file > sedtest

real    0m12.156s
user    0m11.945s
sys     0m0.160s

# time while read s;do echo ${s// /\\ };done < file > whilelooptest

real    2m8.980s
user    1m55.195s
sys     0m11.181s

# time awk 'BEGIN{OFS="\\ "}{$1=$1}1' file > awktest

real    0m2.018s
user    0m1.840s
sys     0m0.176s

#ls -l *test | awk '{print $5,$9}'
29000000 awktest
29000000 sedtest
29000000 whilelooptest

shell loops are the slowest compared to sed/awk, at least from my experiences. For processing large files with text manipulations, its still better to use awk. (or sed...)

unSpawn · 12-21-2007, 04:22 AM

Uhmmm. No. You're right. It's kinda slow.