windows: executeable > filename.txt

tatoosh · 07-29-2009, 04:24 AM

How to do so in linux (centos):

In dos-console i can write output to a file with this example:

dir > filename.txt

when i do this in linux:

postmap filename > filename.txt

the filename.txt will be created but with 0 bytes (=empty)

jdkaye · 07-29-2009, 04:35 AM

No problem for me.

Code:

@Attila:~/Catfon$ ls
catfon35  estel04.gif  src  TIRP.TTF
jdkaye@Attila:~/Catfon$ ls > dir.txt
jdkaye@Attila:~/Catfon$ cat dir.txt
catfon35
dir.txt
estel04.gif
src
TIRP.TTF

I assume you meant something like this.
Did you really mean to type postmap? I have portmap (must be run as root) but not postmap.
cheers,
jdk

Tinkster · 07-29-2009, 04:39 AM

Quote:

Originally Posted by tatoosh

How to do so in linux (centos):

In dos-console i can write output to a file with this example:

dir > filename.txt

Works in Linux to, Linux is just way more powerful and
versatile, but that comes at a price/cost: learning.

Quote:

Originally Posted by tatoosh

when i do this in linux:

postmap filename > filename.txt

the filename.txt will be created but with 0 bytes (=empty)

Depends on what postmap does. Do you see anything when
you run it w/o redirection? If you run it with the re-direct,
do you still see something?

In that case it's probably debug/error output, and that's
not on STDOUT but on STDERR. Try postmap filename 2> filename.txt

Cheers,
Tink

Guttorm · 07-29-2009, 04:44 AM

Some programs write output to "stderr" instead of regular "stdout". These are different, since there then is a way to display error messages even if the output is redirected.

So for example:

java -version >javaversion.txt

This does not work, at least with Sun Java, since it's outputting to stderr.

java -version &>javaversion.txt

This means send both regular output and error output to the file. This works as expected.

tatoosh · 07-29-2009, 04:48 AM

yes i meant postmap

ok that works with "2>".

thanks alot.

now my output file looks like:
postmap: warning: mymails_allowed.db: duplicate entry: "mymail@test.com"

how can i remove all content execpt the mail address, so my output file will be:

mymail@test.com
othermail@here.com
...

Tinkster · 07-29-2009, 04:59 AM

Untested (no postfix here):

Code:

postmap filename 2>| sed -r 's/^.*"(.*@.*)"$/\1/' > filename.txt

tatoosh · 07-29-2009, 05:10 AM

got it with:
| awk '{print $6}' | tr -d "\""

thx for helping !!

Tinkster · 07-29-2009, 05:17 AM

Quote:

Originally Posted by tatoosh

got it with:
| awk '{print $6}' | tr -d "\""

thx for helping !!

Welcome :}

With awk you could save yourself the extra tr ...

Code:

awk -F"[ \"]" '{print $7}'

Admittedly hardly shorter, but it saves you one
extra process ...

tatoosh · 07-29-2009, 05:45 AM

ok thanks!
now i need only the first line and did it with 'head'

how to write the head output in a variable?
example:
$myvar=head -1 1.txt

doesnt work

vonbiber · 07-29-2009, 06:31 AM

Quote:

Originally Posted by tatoosh

ok thanks!
now i need only the first line and did it with 'head'

how to write the head output in a variable?
example:
$myvar=head -1 1.txt

doesnt work

1. to assign a value to a variable:
myvar=...
(and not $myvar=...)

2. to store the contents of 1st line into the 'myvar' variable:
myvar="$(head -n1 1.txt)"

then to display the value of myvar variable:

echo "$myvar"

tatoosh · 07-29-2009, 06:51 AM

ok thx again