about command:tr

[iambluegary]

i cant understand the function of the command tr,for example
there is a file:one
in it:
ie
iei
ieie
i am a boy

when a use command:
tr "[=e=]" "[e*]" two
then i look at file:two
it is the same as one,i dont know what happened

[Paula J Frazer-Campbell]

HI

This may help:-

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x061672106351d5118fef0090279cd0f9,00.html



Paula

[Stefan Schulz]

Hi,

could you please tell us what you tried to accomplishe?

I can't figure out what result you tried to get.

Regards Stefan

[Ralph Grothe]

Have you read the manpage of tr?

It translates (or in Perl-Lingo transliterates) each character of the first character set exactly with the one from the second character set.

[Deepak Extross]

The output is identical to the input because there is *nothing* to translate.
Your input does not have any accented variants of the charcter 'e' (e-umlaut, e-ascent, e-grave', etc).

[Shannon Petry]

May be worth reading on regular expressions for a better understanding. I have the O'Reilly book on sed/ed and it has lots of good info on reg-expressions. I think tr will make much more sense when you see how they work.

Regards!
Shannon

> echo "Mjdsptpgt Sudlt"|tr "[b-t]" "[a-s]"

[SHABU KHAN]

Hi,

tr gets its input through a pipe, try:

cat filename | tr "[=e=]" "[e*]" > test.out


I usually use "tr" to trim the spaces/tabs, It is a very handy command ...

To parse files with uneven spaces between fields

cat filename | tr -s " "

will trim the spaces to just one space between the fields...

cat filename | tr -s "\t" " "

will trim tabs and spaces between fields to just one space ...



Thanks,
Shabu