[SOLVED] searching words with space

divyashree · 05-26-2011, 01:09 AM

I want to search lines with these stings with one or more spaces..

e.g

Code:

a b
a  b
a   b
a    b

How will I achieve this by egrep ?

Telengard · 05-26-2011, 01:20 AM

Code:

foo$ man egrep
foo$ cat infile
ab
a b
a  b
a--b
a   b
a    b
aaabbb
foo$ egrep 'a +b' infile
a b
a  b
a   b
a    b
foo$

divyashree · 05-26-2011, 01:44 AM

Quote:

Originally Posted by Telengard

Code:

foo$ man egrep
foo$ cat infile
ab
a b
a  b
a--b
a   b
a    b
aaabbb
foo$ egrep 'a +b' infile
a b
a  b
a   b
a    b
foo$

No not searching...

I have two variables a and b.

ad I want to search all the lines:
with '$a +$b'

Telengard · 05-26-2011, 01:52 AM

Quote:

Originally Posted by divyashree

I want to search lines

Quote:

Originally Posted by divyashree

No not searching...

Sorry, I don't understand what you mean.

Please provide example input and example output, and be more specific about exactly what you want to do.

divyashree · 05-26-2011, 03:45 AM

Quote:

Originally Posted by Telengard

Sorry, I don't understand what you mean.

Please provide example input and example output, and be more specific about exactly what you want to do.

I want like this:

I have two variables a and b.

I want to search all the lines containing the value of a and b with one or more space between them...

Code:

'$a +$b'

While doing

PHP Code:


			
egrep -i '$a +$b' <file>

it returns nothing..

grail · 05-26-2011, 05:43 AM

Well assuming you want the values of a and b to be expanded you will need to use double quotes.

divyashree · 05-26-2011, 06:11 AM

Quote:

Originally Posted by grail

Well assuming you want the values of a and b to be expanded you will need to use double quotes.

I tried with both single quotes and double quotes... yet no success

grail · 05-26-2011, 06:15 AM

Then I would need to see an example of an input file and the proposed values for a and b?

divyashree · 05-26-2011, 11:09 PM

Quote:

Originally Posted by grail

Then I would need to see an example of an input file and the proposed values for a and b?

lets the input is from "ls -l" where $a stores the month and $b stores the date, when date is single digit there are 2 spaces between $a and $b but one space while date is 2digit.

chrism01 · 05-27-2011, 12:10 AM

If(!) I understand you, a quick n dirty soln is

Code:

grep a file|grep b

grail · 05-27-2011, 01:09 AM

Well parsing ls values would not be my first suggestion for reasons shown here.
If you must though you could use awk as it will handle the spaces for you.

Lastly, your explanation is unclear as month is a part of date so a would already be a subset of b, ie they would not be beside each other.

divyashree · 05-27-2011, 03:03 AM

Quote:

Originally Posted by chrism01

If(!) I understand you, a quick n dirty soln is

Code:

grep a file|grep b

It can work in some situations but not in most of the cases in, my case also...

I want to search the combination ...

chrism01 · 05-27-2011, 11:48 PM

According to your OP, that would work; you only get lines that have both a and b in them, separated by any amt of space

grail · 05-28-2011, 12:42 AM

Quote:

you only get lines that have both a and b in them, separated by any amt of space

Unfortunately Chris I would have to disagree here. If the input is from ls -l being captured in a file:

Code:

-rw-r--r-- 1 grail grail 0 Jan 28/01/2011 May
-rw-r--r-- 1 grail grail 0 May 28/05/2011 October

If we assume that a and b have the following values:

Code:

a=May
b=28

By looking at the data, and knowing we want a and b separated by a space, only the October file should be returned, but using:

Code:

grep a file|grep b

the May file will also be returned.

@OP - have you tried my suggestion of either using awk or putting double quotes around your example:

Code:

egrep -i "$a +$b" <file>

divyashree · 05-28-2011, 01:28 AM

Quote:

Originally Posted by grail

Unfortunately Chris I would have to disagree here. If the input is from ls -l being captured in a file:

Code:

-rw-r--r-- 1 grail grail 0 Jan 28/01/2011 May
-rw-r--r-- 1 grail grail 0 May 28/05/2011 October

If we assume that a and b have the following values:

Code:

a=May
b=28

By looking at the data, and knowing we want a and b separated by a space, only the October file should be returned, but using:

Code:

grep a file|grep b

the May file will also be returned.

@OP - have you tried my suggestion of either using awk or putting double quotes around your example:

Code:

egrep -i "$a +$b" <file>

Yes I tried with doublequotes. Not worked.

Suppose my input contains:

Code:

drwxr-xr-x  2 root root 4096 Feb  2 11:23 79
drwxr-xr-x  2 root root 4096 Feb 12 11:11 8

In my case, in a script, the

Code:

ls -l | egrep -i "$a +$b"

is written.

If I use

Code:

grep $a file|grep $b

then..
let
a=Feb
b=2

I want lines with 2nd feb...
then the above both lines will return..