compare two fields from two different files using awk - unix

Question

I have two files where I want to compare certain fields and produce the output
I have a variable as well
echo ${CURR_SNAP}
123
File1
DOMAIN1|USER1|LE1|ORG1|ACCES1|RSCTYPE1|RSCNAME1
DOMAIN2|USER2|LE2|ORG2|ACCES2|RSCTYPE2|RSCNAME2
DOMAIN3|USER3|LE3|ORG3|ACCES3|RSCTYPE3|RSCNAME3
DOMAIN4|USER4|LE4|ORG4|ACCES4|RSCTYPE4|RSCNAME4
File2
ORG1|PRGPATH1
ORG3|PRGPATH3
ORG5|PRGPATH5
ORG6|PRGPATH6
ORG7|PRGPATH7
The output I am expecting as below where the last column is CURR_SNAP value and the matching will be 4th column of File1 should be matched with 1st column of File2
DOMAIN1|USER1|LE1|ORG1|ACCES1|RSCTYPE1|123
DOMAIN3|USER3|LE3|ORG3|ACCES3|RSCTYPE3|123
I tried with the below code piece but looks like I am not doing it correctly
awk -v CURRSNAP="${CURR_SNAP}" '{FS="|"} NR==FNR {x[$0];next} {if(x[$1]==$4) print $1"|"$2"|"$3"|"$4"|"$5"|"$6"|"CURRSNAP}' File2 File1

Answer 1

With awk:
#! /bin/bash
CURR_SNAP="123"
awk -F'|' -v OFS='|' -v curr_snap="$CURR_SNAP" '{
if (FNR == NR)
{
# this stores the ORG* as an index
# here you can store other values if needed
orgs_arr[$1]=1
}
else if (orgs_arr[$4] == 1)
{
# overwrite $7 to contain CURR_SNAP value
$7=curr_snap
print
}
}' file2 file1
As in your expected output, you didn't output RSCNAME*, so I have overwritten $7(which is column for RSCNAME*) with $CURR_SNAP. If you want to display RSCNAME* column aswell, remove $7=curr_snap and change print statement to print $0, curr_snap.

Answer 2

I wouldn't use awk at all. This is what join(1) is meant for (Plus sed to append the extra column:
$ join -14 -21 -t'|' -o 1.1,1.2,1.3,1.4,1.5,1.6 File1 File2 | sed "s/$/|${CURR_SNAP}/"
DOMAIN1|USER1|LE1|ORG1|ACCES1|RSCTYPE1|123
DOMAIN3|USER3|LE3|ORG3|ACCES3|RSCTYPE3|123
It does require that the files be sorted based on the common field, like your examples are.

Answer 3

You can do this with awk with two-rules. For the first file (where NR==FNR), simply use string concatenation to append the fields 1 - (NF-1) assigning the concatenated result to an array indexed by $4. Then for the second file (where NR>FNR) in rule two test if array[$1] has content and if so, output the array and append "|"CURR_SNAP (with CURR_SNAP shortened to c in the example below and array being a), e.g.
CURR_SNAP=123
awk -F'|' -v c="$CURR_SNAP" '
NR==FNR {
for (i=1;i<NF;i++)
a[$4]=i>1?a[$4]"|"$i:a[$4]$1
}
NR>FNR {
if(a[$1])
print a[$1]"|"c
}
' file1 file2
Example Use/Output
After setting the filenames to match yours, you can simply copy/middle-mouse-paste in your console to test, e.g.
$ awk -F'|' -v c="$CURR_SNAP" '
> NR==FNR {
> for (i=1;i<NF;i++)
> a[$4]=i>1?a[$4]"|"$i:a[$4]$1
> }
> NR>FNR {
> if(a[$1])
> print a[$1]"|"c
> }
> ' file1 file2
DOMAIN1|USER1|LE1|ORG1|ACCES1|RSCTYPE1|123
DOMAIN3|USER3|LE3|ORG3|ACCES3|RSCTYPE3|123
Look things over and let me know if you have further questions.