one more time about sed...

orgazmo · 05-18-2005, 07:56 AM

Oh F***

Could someone tell me what's wrong:

This line works perfectly: sudo sed -n "1p" ls_mpg

but this one: sudo sed -n "${i}p" ls_mpg

gives me one message: 'ed: -e expression n°1, caractère 2: commande inconnue: `

Which mean : unknown command

i=1

So it should give the same result no?

orgazmo · 05-18-2005, 08:40 AM

i'm really losst this time... if someone can help me... i've

long but i don't find what's wrong

keefaz · 05-18-2005, 10:09 AM

I not tested but try (in bash) :

Code:

sudo eval "sed -n ${i}p ls_mpg"

orgazmo · 05-18-2005, 10:16 AM

What is it done for? what should i see?

keefaz · 05-18-2005, 10:20 AM

What do you expect with your sed command ? What do you want to do ?

orgazmo · 05-18-2005, 10:23 AM

lol that's right i should be more precise:

There is a file that contain name of files, like that:

File1
File2
File5
File4

And the first line print:

File1

And want the line that don't work to do the same work as the first one

keefaz · 05-18-2005, 10:29 AM

Ok, what I understand is you want to extract line that matches a certain number

you could try :

Code:

eval "sed -n -e /$i/p ls_mpg"

or more simple with grep :

Code:

grep $i ls_mpg

orgazmo · 05-18-2005, 10:31 AM

No i want to esxtract the line number five for example... but files have random names that could be 542859662521 or zfefge44g41erg7eeggg...

It can not refer to the content of the line

keefaz · 05-18-2005, 10:35 AM

So those lines don't work ?

Code:

sed -n -e ${i}p ls_mpg
# or
eval "sed -n -e ${i}p ls_mpg"

orgazmo · 05-18-2005, 10:38 AM

i reboot under debian and i tell you that

orgazmo · 05-18-2005, 10:55 AM

No it don't work

, i get the same result as before...

must be a problem with the variable, but i do echo ${i} just before and i get "1"

keefaz · 05-18-2005, 11:03 AM

Weird the code works perfectly on my system :

Code:

#!/bin/bash

i=1
sed -n -e ${i}p /etc/passwd

It outputs the first line of passwd file as expected

orgazmo · 05-18-2005, 11:12 AM

Oh shit

So what could the problem be?

Any idea?

orgazmo · 05-18-2005, 11:21 AM

#!/bin/bash

i=1
sed -n -e '${i}p' ls_mpg

i created essai that contains only these 3 lines...

and i get that : sed: -e expression n°1, caractère 0: `{' non refermée

Means '{' unclosed

druuna · 05-18-2005, 11:28 AM

Hi,

Quoting is wrong.

From within a shell script you need to use " instead of '

This works (tried it):

Code:

#!/bin/bash

i=1
sed -n -e "${i}p" ls_mpg

Hope this helps.