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assigning variables

 
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# 1  
Old 06-16-2005
assigning variables
Before I even attempt this, is it possible to grep for a pattern, maybe a partial sentence like "go to page 3", assign that to a variable and then use awk or something to pull out the 3 and assign it to a variable? So first I would have
Gotopg = "go to page 3"
then
page = 3
# 2  
Old 06-16-2005
Quote:
Originally Posted by k@ssidy
Before I even attempt this, is it possible to grep for a pattern, maybe a partial sentence like "go to page 3", assign that to a variable and then use awk or something to pull out the 3 and assign it to a variable? So first I would have
Gotopg = "go to page 3"
then
page = 3

Certainly, you can grep for strings having more than one word.

In your case, if you trying to find page numbers, you can sed for numbers and store it

Code:
grep -h -o 'go to page 3' *

will print only those instances of the above string.

You can collect the result, sed it for numbers and then get the numbers printed into the variable.


Vino
# 3  
Old 06-16-2005
How about this

Code:
grep -h -o 'go to page 3' kas.txt | sed -n -e 's/.*\([0-9]\).*/\1/p'


kas.txt contains

[~/temp]$ cat kas.txt
go to page 3
go to page 4
go to page 5
go to page 6


The above prints out 3

Vino.
# 4  
Old 06-16-2005
On second thoughts Smilie ,

why introduce grep and sed when you can do just with sed. Smilie

This is better

Code:
sed -n  -e 's/go to page.*\([0-9]*[^0-9]\)/\1/p' kas.txt

It will pick out numbers having more than 1 digit.

It prints out

sh-2.05b$ sed -n -e 's/go to page.*\([0-9]*[^0-9]\)/\1/p' kas.txt
3
4
5
16



Vino
# 5  
Old 06-16-2005
wouldn't this be easier and more efficient?

sed -n '/go to page [0-9]/s/.*go to page \([0-9][0-9]*\).*/\1/p' kas.txt

P.S. updated!
Last edited by vgersh99; 06-16-2005 at 11:08 AM..
# 6  
Old 06-16-2005
that is very interesting and helpful, thank you, I'm new to this and have been mainly working with grep and awk, the introduction to sed is welcomed, I'm trying to learn as much as I can. Thanks!
# 7  
Old 06-16-2005
Quote:
Originally Posted by vgersh99
wouldn't this be easier and more efficient?

sed '/go to page [0-9]/s/.*go to page \([0-9][0-9]*\).*/\1/' kas.txt

Interesting indeed! Our replies came about the same time.

Vino
 
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