awk script to search output for a value and print


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# 1  
awk script to search output for a value and print

Code:
GOODNUMBERS="1 2 3 4 5 6 3 3 34 34 5 66 12"
BADNUMBERS="7 3 12 5 66"

for eachnum in `echo ${GOODNUMBERS}`
do
        echo ${BADNUMBERS} | gawk -v threshold=${eachnum} '$1 != threshold'
done

what im trying to do with the above is, i want to print numbers that are in the GOODNUMBERS variable IF AND ONLY IF they are not in the BADNUMBERS variable.

how can i do this in awk?
# 2  
Why awk? Try:

Code:
for i in $GOODNUMBERS
do
  for j in $BADNUMBERS
  do
    if [ $i = $j ]; then
      continue 2
    fi
  done
  echo $i
done

This User Gave Thanks to Scrutinizer For This Post:
# 3  
Quote:
Originally Posted by Scrutinizer
Why awk? Try:

Code:
for i in $GOODNUMBERS
do
  for j in $BADNUMBERS
  do
    if [ $i = $j ]; then
      continue 2
    fi
  done
  echo $i
done


the list of numbers in the GOODNUMBERS variable have the potential to be very big.. so i was worried using a for loop can be very slow.
# 4  
How big could that list in the GOODNUMBERS variable become then?
# 5  
Code:
awk -vg="${GOODNUMBERS}" -vb="${BADNUMBERS}" 'BEGIN{n=split(g, a); for(i=1; i<=n; i++) {if(b !~ "(^| )" a[i] "($| )") print a[i]}}'

---------- Post updated at 04:28 AM ---------- Previous update was at 04:08 AM ----------

I dont know about the variable limitation in awk, but if it cannot hold as much data as shell does, you could use below
Code:
awk -vb="${BADNUMBERS}" '{n=split($0, a); for(i=1; i<=n; i++) {if(b !~ "(^| )" a[i] "($| )") print a[i]}}' <<<${GOODNUMBERS}

This User Gave Thanks to SriniShoo For This Post:
# 6  
This will reduce the number of elements to be searched by every hit:
Code:
G=($GOODNUMBERS)
for i in $BADNUMBERS
   do for j in ${!G[@]}
      do [ $i -eq 0"${G[j]}" ] && unset G[j]
      done
   done
echo ${G[@]}
1 2 4 6 34 34

This User Gave Thanks to RudiC For This Post:
# 7  
@Srinishoo:
The variable limitation is not in awk, nor is it a limitation of the shell, but rather an OS limitation determined by the configuration variable ARG_MAX ( getconf ARG_MAX ) .
This User Gave Thanks to Scrutinizer For This Post:
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