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Shell Programming and Scripting

Loop with multiple delimited variables

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Top Forums Shell Programming and Scripting Loop with multiple delimited variables
# 8  
Old 03-09-2016
${#A[@]} is array A's element count, ${!A[@]} lists all the indices into array A.

For the quoting of string variables, try

Code:
QUS() { FMT="%s"; [[ $1 =~ [^[:digit:]] ]] && FMT="'%s'"; printf $FMT $1; }
for i in ${!A[@]}; do echo "insert into table ($(QUS ${A[$i]}), $(QUS ${B[$i]}), $(QUS ${C[$i]}));" ; done
insert into table (1, 'a', 0);
insert into table (23, 'ab', 0);
insert into table (234, 'xyz', '1a2b');

# 9  
Old 03-09-2016
Quote:
Originally Posted by rdrtx1
try something like:
Code:
var1=1,23,234
var2=a,ab,xyz
var3=0,0,0

IFS="," arr1=($var1)
IFS="," arr2=($var2)
IFS="," arr3=($var3)

IFS cannot be set local to an array assignment. So you would need to set it globally and use something like:
Code:
oldIFS=$IFS
IFS=,
arr1=($var1) arr2=($var2) arr3=($var3)
IFS=$oldIFS

Quote:
Code:
seq 0 2 | while read i
do
   echo " insert into table (${arr1[$i]}, '${arr2[$i]}', ${arr3[$i]});"
done

Why use an (outdated) external program (seq) and a pipe when we can use shell syntax
Code:
for i in 0 1 2
do

In bash, zsh and ksh93 you can use:
Code:
for i in {0..2}
do

or
Code:
for (( i=0; i<=2; i++))
do


Not important, but perhaps interesting is that there is no need to use a $ sign for a variable reference used as an index to an array:

Code:
echo "insert into table (${arr1[i]}, '${arr2[i]}', ${arr3[i]});"

Last edited by Scrutinizer; 03-09-2016 at 04:33 PM..
# 10  
Old 03-09-2016
thank you all for your valuable inputs. i can incorporate this now:

code

Code:
#!/bin/sh

var1=1,23,234,1
var2=a,ab,xyz,z
var3=0,0,0,1
var4=0,0,0,1


len=`echo $var1 | awk -F '[,]' '{print  NF-1}'`
echo "$len"

oldIFS=$IFS
IFS=,
arr1=($var1) arr2=($var2) arr3=($var3)  arr4=($var4)
IFS=$oldIFS

for (( i=0; i<=3; i++))
do
  echo " insert into table (${arr1[$i]},${arr2[$i]},${arr3[$i]},${arr4[$i]});"
done

Last edited by Scrutinizer; 03-09-2016 at 03:01 PM.. Reason: code tags
# 11  
Old 03-09-2016
You are welcome. To add, instead of
Code:
len=`echo $var1 | awk -F '[,]' '{print  NF-1}'`

one could also use plain shell, without external programs:
Code:
len=${#arr1[@]}

after arr1 is set...

--
=> Please use code tags next time for code and data <=
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