Visit Our UNIX and Linux User Community


Removing Letters from Integer String


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Removing Letters from Integer String
# 1  
Old 06-12-2003
Removing Letters from Integer String

Hi all,

I have a variable, on some machines it is '1024', which is fine, but on others it is '1024Mb' etc. I need this variable to simply be '1024', does anyone know how I could ensure this is always the case? Perhaps a command to remove any letters/characters that aren't integers if there is one?

Thanks.
# 2  
Old 06-12-2003
Well, you could use
Code:
echo "1024MB" | awk '{print substr($1,0,4)}' # print first four numbers / chars
echo "1024MB" | sed 's/[A-Za-z]*//g'         # removes all letters
x=${x%%[A-Za-z]*}           # remove everything after (and including) any chars


Last edited by oombera; 06-12-2003 at 01:27 PM..
# 3  
Old 06-12-2003
Assuming sh, ksh, zsh (, bash?):
Code:
y=1024
z=1024Mb
sizey=`expr "$y" : '\([0-9][0-9]*\)'`
sizez=`expr "$z" : '\([0-9][0-9]*\)'`

$sizey and $sizez will now both be 1024.

Note that oombera's third solution depends on ksh.
# 4  
Old 06-13-2003
Try this:
echo 1245MB |tr -d [A-Z][a-z]

-Yeheya

Previous Thread | Next Thread
Test Your Knowledge in Computers #262
Difficulty: Easy
During the Second World War, Alan Turing worked for the Government Code and Cypher School (GC&CS) at Bletchley Park, Britain's codebreaking centre that produced Ultra intelligence.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Removing letters after a certain character within a range of columns

Hi there, I am trying to remove al letters after : character on specific columns from 10th column till 827. I used sed and cut to do so but I am sure there is better one liner someone can think of from unix community members. Huge file but it has this structure (Total number of Columns =... (10 Replies)
Discussion started by: daashti
10 Replies

2. Shell Programming and Scripting

String to integer

I am on HP-UX using ksh in the script. MaxSal=`sqlplus -silent /nolog <<EOF connect / as sysdba whenever sqlerror exit sql.sqlcode set pagesize 0 feedback off verify off heading off echo off select max(sal) from emp1; select max(sal) from emp2; select max(sal) from emp3; exit; EOF`... (3 Replies)
Discussion started by: bang_dba
3 Replies

3. Shell Programming and Scripting

awk : match only the pattern string , not letters or numbers after that.

Hi Experts, I am finding difficulty to get exact match: file OPERATING_SYSTEM=HP-UX LOOPBACK_ADDRESS=127.0.0.1 INTERFACE_NAME="lan3" IP_ADDRESS="10.53.52.241" SUBNET_MASK="255.255.255.192" BROADCAST_ADDRESS="" INTERFACE_STATE="" DHCP_ENABLE=0 INTERFACE_NAME="lan3:1"... (6 Replies)
Discussion started by: rveri
6 Replies

4. Shell Programming and Scripting

Checking subset and removing extra letters

In each line of file, I wish to check if word1 is a non-connected subset of any of the other words in the line. If yes, keep only the words that ward1 is a subset of. Else, remove the whole line. Also, I want to remove the letters that word1 doesn't match with, except for "_+" Example file:... (2 Replies)
Discussion started by: Viernes
2 Replies

5. Homework & Coursework Questions

passing letters from an array into a string for string comparison

attempting the hangman program. This was an optional assignment from the professor. I have completed the logical coding, debugging now. ##I have an array $wordString that initializes to a string of dashes ##reflecting the number of letters in $theWord ##every time the user enters a (valid)... (5 Replies)
Discussion started by: lotsofideas
5 Replies

6. Shell Programming and Scripting

how to compare string integer with an integer?

hi, how to I do this? i="4.000" if ; then echo "smaller" fi how do I convert the "4.000" to 4? Thanks! (4 Replies)
Discussion started by: h0ujun
4 Replies

7. UNIX for Dummies Questions & Answers

integer to string

Hi all, is there an easy way to convert integer to string in bash? I have numbers like 1, 2, ..., 112, ... and I would like to get 001 002 003 004 ... Thank you, Sarah (4 Replies)
Discussion started by: f_o_555
4 Replies

8. Shell Programming and Scripting

Comparing string and integer in IF

hi, I need to create an IF condition. I read a line from a file and get the 5 word using space as a delimited. This word can have only two values either '*' or '1-5' I need to write an IF condition for two cases. I can either compare it to * or 1-5(or even 1 by cutting and getting only the... (3 Replies)
Discussion started by: kaushys
3 Replies

9. Shell Programming and Scripting

Checking if string contains integer

G'day guys, first post so be gentle. I need help with some code to work out if a variable (string) contains any integers. The valid variable (string) must contain only letters. Also need to be able to work out if a variable contains only integers. Any help greatly appreciated. (7 Replies)
Discussion started by: haz
7 Replies

10. Programming

Integer to String

Which function should I use to convert an Integer to a String or Char format ? Thanx (2 Replies)
Discussion started by: psilva
2 Replies

Featured Tech Videos