bash: combine arrays with weird substitution/references

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Old 10-13-2009
bash: combine arrays with weird substitution/references

Hi all.

I'm trying to finish a bash script with the following elements:
ARRAY[0]="blah $ITEM blah blah"
ARRAY[1]="blah blah $ITEM blah bluh"
# ...the ARRAY elements represent a variable but defined
#    syntax and they're all hard-coded in the script.


ITEMS='1.0 2.3 -4.0'
#ITEMS=' .... '
# ...the ITEMS 'vector' comes from the command line

ARRAY[@] and ITEMS should have to get finally combined into NEWARRAY as detailed:

NEWARRAY[0]=blah 1.0 blah blah"
#(as ARRAY[0], but substituted with 1st item)
NEWARRAY[1]="blah 2.3 blah blah"
#(as ARRAY[0], but substituted with 2nd item)
NEWARRAY[2]="blah -4.0 blah blah"
#(as ARRAY[0], but substituted with 3rd item)
NEWARRAY[3]="blah  blah 1.0 blah bluh"
NEWARRAY[4]="blah blah 2.3 blah bluh"
NEWARRAY[5]="blah blah -4.0 blah bluh"
# (as ARRAY[1], but substituted)
# (...)

I think that the combination issue is not a mayor problem as it could be (naively?) resolved with 2 loops:

 c0=0; while [ $c0 -lt ${#ARRAY[@]} ]; do
    for elem in $ITEM; do
    let "c0+=1"

Nevertheless the main problem to me is to get the $ITEMS values correctly referenced (if possible) within NEWARRAY during execution time. Anyway, I'm not sure if the whole stuff is well set...

Any help will be (desperately) welcome...


Last edited by yomaya; 10-13-2009 at 08:42 PM..
# 2  
Old 10-13-2009
me@tinybird:~$ ARRAY[0]="blah $ITEM blah blah"
me@tinybird:~$ echo ${ARRAY[0]}
blah blah blah
me@tinybird:~$ ARRAY[0]='blah $ITEM blah blah'
me@tinybird:~$ echo ${ARRAY[0]}
blah $ITEM blah blah
me@tinybird:~$ ITEM=1.0
me@tinybird:~$ echo ${ARRAY[0]}
blah $ITEM blah blah
me@tinybird:~$ eval echo ${ARRAY[0]}
blah 1.0 blah blah
me@tinybird:~$ eval 'NEWARRAY[5]=${ARRAY[0]}'
me@tinybird:~$ eval echo ${NEWARRAY[5]}
blah 1.0 blah blah

Last edited by Scrutinizer; 10-14-2009 at 04:33 AM..
# 3  
Old 10-14-2009

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