Extracting nth length of character from a variable to another variable

hayloiuy · 05-02-2011, 10:13 AM

Example, I want to extract the first four character from serial and store it into version.

Code:

serial= 10001100
version=...(codes)....
echo $version

output in the terminal:
1000

Just to show you guys i havent been lazy...

Code:

#!/bin/bash

serial=10110011
echo $serial> serial.txt

version= cut -c1-4  serial.txt

echo $version

but this code saves the value into a text file. I want a code that does not save into any file whatsoever. Help? Thanks.

Nylex · 05-02-2011, 10:17 AM

http://tldp.org/LDP/abs/html/string-manipulation.html.

cepheus11 · 05-02-2011, 10:17 AM

The "cut" man page says: "With no FILE, or when FILE is -, read standard input."

Code:

version=$(echo $serial | cut -c1-4)
echo $version

Telengard · 05-02-2011, 11:01 AM

Quote:

Originally Posted by hayloiuy

Example, I want to extract the first four character from serial and store it into version.

Code:

serial=10001100
version=...(codes)....
echo $version

output in the terminal:
1000

Code:

foo$ serial=10001100
foo$ version=${serial:0:4}
foo$ echo $version
1000

http://www.gnu.org/software/bash/man...eter-Expansion

HTH

speedy64 · 05-02-2011, 03:47 PM

I've had some success using typeset with ksh, does not work with bash.

Code:

typeset -L4 version

serial=10001100
version=$serial

echo $version