remove a line of a file

03-04-08, 11:15 AM

ABSOLUT

Hi,

I have the variable Line=adios.
If I have this file (palabras)

hola
adios
ahora

And I want to remove the line "adios" and the file will be:

hola
ahora

How could I remove the line adios?

I'm trying:

sed '/"$Line"/d' < palabras > palabras2

But doesn't work. Any help?
Thanks a lot and sorry for my english

03-04-08, 11:43 AM

ABSOLUT wrote:
[..]
> hola
> ahora
>> How could I remove the line adios?
>
> I'm trying:
>
> sed '/"$Line"/d' < palabras > palabras2
>

sed "/$Line/d" < palabras > palabras2

03-04-08, 12:12 PM

Michael Tosch

PM wrote:
> ABSOLUT wrote:
>> sed "/$Line/d" < palabras > palabras2

or

sed '/'"$Line"'/d' palabras > palabras2

or

grep -v "$Line" palabras > palabras2

03-04-08, 12:21 PM

Thomas Maier-Komor

PM schrieb:
> ABSOLUT wrote:
>> sed "/$Line/d" < palabras > palabras2

what if $Line happens to contain a slash character '/'?

03-04-08, 12:23 PM

Andrew Gabriel

In article <fqjeah$8nm$1>,
Michael Tosch <eedmit> writes:
>
> or
>
> sed '/'"$Line"'/d' palabras > palabras2

The single quotes aren't necessary, e.g.

sed /"$Line"/d palabras > palabras2

This doesn't cope with certain characters in $Line, such as /

> or
>
> grep -v "$Line" palabras > palabras2

or better,

grep -vx "$Line" palabras > palabras2

to avoid partial matches.

03-04-08, 02:11 PM

Richard Skelton

Andrew Gabriel wrote:
> In article <fqjeahnm>,
> Michael Tosch <eedmit> writes:
>
> The single quotes aren't necessary, e.g.
>
> sed /"$Line"/d palabras > palabras2
>
> This doesn't cope with certain characters in $Line, such as /
>> or better,
>
> grep -vx "$Line" palabras > palabras2
>
> to avoid partial matches.
>
I note that this is /usr/xpg4/bin/grep not /usr/bin/grep :-)

Cheers
Richard.

03-04-08, 04:48 PM

Chris Mattern

On 2008-03-04, ABSOLUT <davidtuti> wrote:
[..]
>
> How could I remove the line adios?
>
> I'm trying:
>
> sed '/"$Line"/d' < palabras > palabras2
>
> But doesn't work. Any help?
> Thanks a lot and sorry for my english
>
Using the single quotes prevents the shell from interpolating $line.
As you don't have any special characters in the sed command, you don't
need quotes for it anywas. $line should remain quoted as it may have
spaces in it. Also, sed can take a input file name instead of using
standard input. This should work:

sed /"$Line"/d palabras > palabras2

If you want to remove all lines that contain "adios", you'd have
to set Line to that value first, of course.

03-04-08, 06:09 PM

usenetpersongerryt

On Mar 4, 3:15 am, ABSOLUT <davidt> wrote:
>
> I have the variable Line=adios.
> If I have this file (palabras)
> hola
> adios
> ahora
> And I want to remove the line "adios" and the file will be:
> hola
> ahora
> How could I remove the line adios?

Use ed.
r FILE
/REGEX/d
w
q
<<EOF kind of construct would likely do

> I'm trying:
> sed '/"$Line"/d' < palabras > palabras2

Which would seemingly evaluate to
sed '//d'

> But doesn't work. Any help?
> Thanks a lot and sorry for my english

Nothing to do with English. You are
using single quotes and double quotes in a shell environment,
evidently inside some script. Buy a book on shell scripting maybe.

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