variable substitution in ksh

aoussenko · #1 (**permalink**) 06-11-2009

Hi
I have a variable BIT1 which holds some value. Is there a way to retrieve the value of this variable indirectly via another variable, lets say SUBSET_BIT_NUM=1, so the call will look something like this:

sundev1 $ echo ${BIT${SUBSET_BIT_NUM}}
ksh: ${BIT${SUBSET_BIT_NUM}}: bad substitution

Thanks a lot for any advice -A

vgersh99 · #2 (**permalink**) 06-11-2009

Code:

#!/bin/ksh

BIT1=aoussenko
BIT2=foo

SUBSET_BIT_NUM=1

eval echo \${BIT${SUBSET_BIT_NUM}}

fpmurphy · #3 (**permalink**) 06-11-2009

The following also works

Code:

eval echo '${BIT'${SUBSET_BIT_NUM}'}'

cfajohnson · #4 (**permalink**) 06-11-2009

Quote:

Originally Posted by fpmurphy

The following also works

Code:

eval echo '${BIT'${SUBSET_BIT_NUM}'}'

That's not very reliable:

Code:

  BITTER=qwerty
  SUBSET_BIT_NUM=TER
  IFS=E
  eval echo '$BIT'$SUBSET_BIT_NUM  ## unreliable
  eval echo "\$BIT$SUBSET_BIT_NUM" ## correct

The output is:

Code:

R
qwerty

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