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variable substitution in ksh

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# 1  
Old 06-11-2009
variable substitution in ksh
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
# 2  
Old 06-11-2009
Code:
#!/bin/ksh

BIT1=aoussenko
BIT2=foo

SUBSET_BIT_NUM=1

eval echo \${BIT${SUBSET_BIT_NUM}}

# 3  
Old 06-11-2009
The following also works
Code:
eval echo '${BIT'${SUBSET_BIT_NUM}'}'

# 4  
Old 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

This User Gave Thanks to cfajohnson For This Post:
arun_maffy
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