sed extracting numbers

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting sed extracting numbers
# 1  
Old 10-11-2013
sed extracting numbers

I have number

I want to extract from this number with sed 21 and 8 to variables a and b. Any Ideas?

I did like 's/\(192.168.\)/ /' but its wrong Smilie

Last edited by Natalie; 10-11-2013 at 07:53 PM..
# 2  
Old 10-11-2013
Longhand using OSX 10.7.5, default bash terminal, without the use of sed...
Last login: Fri Oct 11 23:52:49 on ttys000
AMIGA:barrywalker~> IFS="."
AMIGA:barrywalker~> num=""
AMIGA:barrywalker~> arr=($num)
AMIGA:barrywalker~> x="${arr[2]}"
AMIGA:barrywalker~> y="${arr[3]}"
AMIGA:barrywalker~> echo "$x"
AMIGA:barrywalker~> echo "$y"
AMIGA:barrywalker~> _

# 3  
Old 10-12-2013
a=$(awk -F. '{print $3}' <<< "$var")
b=$(awk -F. '{print $4}' <<< "$var")
echo $a $b
21 8

# 4  
Old 10-12-2013
Just to show how to use a regex with creation of pseudo-index to get a field:
$ echo '' | sed 's/\([0-9]*\.\)\{0\}\([0-9]*\).*/\2/'
$ echo '' | sed 's/\([0-9]*\.\)\{1\}\([0-9]*\).*/\2/'
$ echo '' | sed 's/\([0-9]*\.\)\{2\}\([0-9]*\).*/\2/'
$ echo '' | sed 's/\([0-9]*\.\)\{3\}\([0-9]*\).*/\2/'

# 5  
Old 10-12-2013
IFS=. read _ _ a b << EOF


bash or ksh93:
IFS=. read _ _ a b <<< "$var"

@wisecracker, $IFS would need to be saved and restored afterwards

Last edited by Scrutinizer; 10-12-2013 at 01:34 PM..
This User Gave Thanks to Scrutinizer For This Post:
# 6  
Old 10-12-2013
Hi Scrutinizer...

I was aware of saving and restoring IFS as I use it in the AudioScope code but was merely showing how to extract the two variables in simple and understandable terms...

I will remember to do it longhand fully next time... ;o)
# 7  
Old 10-12-2013
Originally Posted by Scrutinizer
IFS=. read _ _ a b << EOF

Since you are not interested in keeping the 2 first number you could also
IFS=. read a a a b << EOF

(would save the _ )
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Extracting numbers

Hi I am part of a academic organization and I want to send a fax to the students however there must be a quicker way to get the fax numbers extracted from the online forms they sent me. The file looks like this (numbers are fake in order to protect identity): Biochemistry Major Michael... (3 Replies)
Discussion started by: phil_heath
3 Replies

2. Shell Programming and Scripting

Help extracting single instance of numbers which repeat

Hi, the title isn't very descriptive but it'll be easier to explain what I need if I write out the coordinates from which I need to extract certain information: ATOM 2521 C MAM X 61 44.622 49.357 12.584 1.00 0.00 C ATOM 2522 H MAM X 61 43.644 49.102 12.205 ... (10 Replies)
Discussion started by: crunchgargoyle
10 Replies

3. Shell Programming and Scripting

extracting non-zero pairs of numbers from each row

Hi all, I do have a tab delimited file a1 a2 b1 b2 c1 c2 d1 d2 e1 e2 f1 f2 0 0 123 546 0 0 0 0 0 0 0 0 0 0 345 456 765 890 902 1003 0 0 0 0 534 768 0 0 0 0 0 0 0 0 0 0 0 0 0 0 456 765 0 0 0 0 0 0 0 0 0 0 0 0 12 102 0 0 0 0 456 578 789 1003 678 765 345 400 801 1003 134 765... (5 Replies)
Discussion started by: Lucky Ali
5 Replies

4. Shell Programming and Scripting

[Solved] Help on extracting the numbers out of top command

Hi guys, Any easy way to generate a CSV file that contains only the numbers out of the following lines? load averages: 15.09, 12.89, 11.76 03:39:22 999 processes: 854 sleeping, 2 running, 122 zombie, 5 stopped, 16 on cpu Memory: 32G real, 17G free, 18G swap in use, 15G swap free ... (6 Replies)
Discussion started by: ejianu
6 Replies

5. UNIX for Dummies Questions & Answers

Extracting numbers from a String

Hi all, I'm a new programmer to shell script... and I have no idea how to use substring. I want to extract the numbers from the following string and place it into a variable: "170 unique conformations found" The numbers can be more than three digits depending on the case. I just want to... (10 Replies)
Discussion started by: ah7391
10 Replies

6. Shell Programming and Scripting

Extracting formatted text and numbers

Hello, I have a file of text and numbers from which I want to extract certain fields and write it to a new file. I would use awk but unfortunately the input data isn't always formatted into the correct columns. I am using tcsh. For example, given the following data I want to extract: and... (3 Replies)
Discussion started by: DFr0st
3 Replies

7. Shell Programming and Scripting

Extracting numbers from a string

Hello Everyone, i have quick question. I have file names like: bin_map300.asc and I would like to extract grid300. My approach so far: name=bin_map300.asc echo ${name%%.*} echo ${name##*_} I am stuck combining the two. Any help would be appreciated. (3 Replies)
Discussion started by: creamcheese
3 Replies

8. UNIX for Dummies Questions & Answers

Extracting numbers and multipling

Hi All, I have searched the forum but couldn't find exactly what I need. Hopefully someone may be able to help. I'm trying to put a script together that will extract numbers from a text file and multiply them by, for example 1.5 or 1.2 Sample file looks like this...... (1 Reply)
Discussion started by: speedfreak
1 Replies

9. Shell Programming and Scripting

Error extracting 1 or more numbers with expr command

Need help with the following, I want to extract the digits from the following file pattern using the expr command. digits are in the range 1-99 Tried two different methods, not sure what I am doing wrong. file1=file1.dbf file10=file10.dbf Works for expr "$file10" : '.*\(\)' 10 ... (2 Replies)
Discussion started by: fire!
2 Replies

10. Shell Programming and Scripting

extracting numbers from strings

Hello all, I am being dumb with this and I know there is a simple solution. I have a file with the follwing lines bc stuff (more)...............123 bc stuffagain (moretoo)............0 bc stuffyetagain (morehere)......34 failed L3 thing..............1 failed this... (2 Replies)
Discussion started by: gobi
2 Replies
Login or Register to Ask a Question