Very Computer

by **Mats Larss** » Tue, 16 Nov 1999 04:00:00

Only one problem with this. If the string is shorter than 3 characters this
statement returns nothing. Maybe You want the the whole string to be returned
in these cases.

>> [ This is a repost of an article that didn't make it beyond the local
>> network. Sorry if the topic is a bit out of date. ]

>> >>how can i extract the 3 last characters of a string ?

>> >If you're using ksh, bash, POSIX shell etc, try using:

>> >typeset -R3 fred=${jim}

>> POSIX shells are not required to support "typeset". Those that do
>> are probably just ksh in disguise.

>How about this?
>expr $string : '.*$...$'

by **Ken Pizzi** » Wed, 17 Nov 1999 04:00:00

Quote:>>> >>how can i extract the 3 last characters of a string ?
>>> >If you're using ksh, bash, POSIX shell etc, try using:
>>> >typeset -R3 fred=${jim}
>>> POSIX shells are not required to support "typeset". Those that do
>>> are probably just ksh in disguise.
>>How about this?
>>expr $string : '.*$...$'
>Only one problem with this. If the string is shorter than 3 characters this
>statement returns nothing. Maybe You want the the whole string to be returned
>in these cases.

This should be highly portable:
case $string in
???*) expr "$string" : '.*$...$' ;;
*) cat <<END ;;
$string
END
esac

--Ken Pizzini

Very Computer

Substring in sh

Substring in sh

Substring in sh