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Extracting substring from variable


 
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# 1  
Old 05-18-2016
Extracting substring from variable

Hi All,

I'm facing issue wherein I have 2 character string like 'CR' and 'DR' and I want to extract just 1st character but am unable to do it. I tried below options but they are returning me 2nd character only,

Code:
var="CR"

Code:
echo ${var:1}

returns just "R"

Code:
echo ${var:0}

returns "CR"

Code:
expr substr $var 1 1

doesn't work at my end it.

Any suggestions please.

Thanks,
Arvind.
# 2  
Old 05-18-2016
Code:
${var:0:1}

# 3  
Old 05-18-2016
What shell are you working in?

If it's ksh (and possibly bash too) you can do this sort of thing:-
Code:
echo ${var%?}

It looks shocking, but it is slicing the variable up a little. It is called variable substitution and you should be able to get a fuller explanation if you search for that. It would probably not be best if I try to re-write existing documentation.



I hope that this helps,
Robin
# 4  
Old 05-18-2016
The one below should work irrespective of shell version...
Code:
export var="DR"
echo ${var%"${var#[A-Z]}"}
D

# 5  
Old 05-18-2016
Code:
typeset -L1 var

# 6  
Old 05-19-2016
Thanks alot to all, all the solution mentioned worked.

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