Truncate string variable

Shell Programming and Scripting
1

Hi,

I want to truncate a string variable, returned in the script. In perl I used the below and it worked.

BRNo=BR12345
$BR = substr($BRNo, 2, 7)

How can I do it in sh.

Thanks !

2 
echo 'BR12345' | sed 's/^..\(.....\).*/\1/'
3 
$ expr $BRNo : '..\(.....\)'
12345
$ expr $BRNo : '..\(.\{5\}\)'
12345
4

Two other ways for substrings :

$ Str=123456789
$ s1=$(expr substr "${Str}" 2 3)
$ echo $s1
234
$ s2=${Str:1:3}    # bash
$ echo $s2
234
$

Jean-Pierre.

5 
brno=br12345
br=`echo $brno|cut -c3-7`
6

Jean, You missed the assignment statement to s1 variable

7

in ksh, just use a variable declaration:

typeset -L5 x

x=aslkdhflaalkshdlkhasd
echo $x
aslkd
8

Thanks everyone, I got it to work !

9

Oups!

Missing statement added, was :

$ s1=$(expr substr "${Str}" 2 3)

Jean-Pierre.