sed programming

[benny_toto]

i have problem like:

sample input:

s123 s3
s32532 s88888888
s3
s56
s23@hotmail.com
abcd@hotmail.com

i need a sed script to make the output like

s00000123 s00000003
s00032532 s88888888
s00000003
s00000056
s00000023@msn.com
abcd@msn.com


it means if the work start with 's' than make it 8 digit(add 0s)
and also change the hotmail.com to msn.com

[lakerdonald]

# foo.sed
s/s/s00000000/g
s/hotmail/msn/g

Then:

cat input | sed -f foo.sed

[benny_toto]

it not replace by s0000000
it is if the digit follow s not 8 digit than add 0s to make it 8 digits

[valan]

Try reading the sed man page and doing your own homework.

[anomie]

it not replace by s0000000

Well, sed is a stream editor. So it replaces things.

In order to do this you're going to need to have a double expression to match every possibility up until eight digits. For example:

sed -e 's/^s[0-9]\{2\}$/s000000&/g' -e 's/s//2' some-file

This will match a value like 's91' and turn it into 's00000091'. You will need a double expression likewise to match 's1', 's391', s'0391', etc. etc. (To break this down into little details: the first expression matches a line that starts with s and then has two digits and nothing else on the line; then it replaces it with s, a series of zeroes, and the expression it matched; then the second expression replaces the second s with nothing.)

Pretty complicated, eh? Maybe sed is not the right tool for this. You should look into awk as well, and maybe python.

"When all you have is a hammer, everything looks like a nail." - as they say.

[benny_toto]

i still got the problem in the line like:
s1 s2 s3

i can replace like
s00000001 s2 s0000003

but i can not do any thing with the s2

[scm]

Why have you chosen to use sed for this task?

[lordnothing]

is this homework or are you teaching yourself out of a book?

if you're teaching yourself, re-read about count arguments to sed commands and such.

if it's homework, stop asking us to do *your* homework.