awk if else condition when string is not present in the file - awk

Question

I am trying to use awk to convert a multi-line block to a single record and then trying to run a search operation on it. I am running lspci -v as the input command, but to I have mock the data for this question.
Input data:
name: foobar
data: 123 bad
name: foozoo
data: 123 good
name: foozoo
data: 123 bad
name: zoobar
data: 123 good
name: barzpp
data: 123 bad
First I converted the input data that was in blocks into single-line records.
awk -v RS='' '{$1=$1}1' xx
name: foobar data: 123 bad
name: foozoo data: 123 good
name: foozoo data: 123 bad
name: zoobar data: 123 good
name: barzpp data: 123 bad
Now I am searching for a string "foozoo" and this gives me desired results. Here, I am first checking if foozoo is present on the line, and then I am checking if .*good is present in the same line. This works fine.
awk -v RS='' -v var=foozoo '{$1=$1}; {if(match($0,var)) if(match($0,var ".*good")) print var " is good"; else print var " is missing"}' xx
foozoo is good
foozoo is missing
Now, when I supply a non-existing string the awk will return nothing, which make sense as there is no else block.
awk -v RS='' -v var=THIS_DOES_NOT_EXIST '{$1=$1}; {if(match($0,var)) if(match($0,var ".*good")) print var " is good"; else print var " is missing"}' xx
When I put else block and search for an existing, string in the input. I get this, I do not want this. I only want the foozoo is good and foozoo is bad lines.
awk -v RS='' -v var=foozoo '{$1=$1}; {if(match($0,var)) {if(match($0,var ".*good")) print var " is good"; else print var " is missing"} else {print "NON-EXISTING_DATA_REQUESTED"}}' xx
NON-EXISTING_DATA_REQUESTED
foozoo is good
foozoo is missing
NON-EXISTING_DATA_REQUESTED
NON-EXISTING_DATA_REQUESTED
Similarly, when I run for non-existing data, I get the line NON-EXISTING_DATA_REQUESTED for each, record, how to print just one line saying data does not exist.
awk -v RS='' -v var=monkistrying '{$1=$1}; {if(match($0,var)) {if(match($0,var ".*good")) print var " is good"; else print var " is missing"} else {print "NON-EXISTING_DATA_REQUESTED"}}' xx
NON-EXISTING_DATA_REQUESTED
NON-EXISTING_DATA_REQUESTED
NON-EXISTING_DATA_REQUESTED
NON-EXISTING_DATA_REQUESTED
NON-EXISTING_DATA_REQUESTED
Here's that last script above formatted legibly by gawk -o-:
{
$1 = $1
}
{
if (match($0, var)) {
if (match($0, var ".*good")) {
print var " is good"
} else {
print var " is missing"
}
} else {
print "NON-EXISTING_DATA_REQUESTED"
}
}

Answer 1

It sounds to me that you only want to print NON-EXISTING_DATA_REQUESTED if no matches (foozoo and good) are found and then only print one occurrence of NON-EXISTING_DATA_REQUESTED; if this is correct, one idea would be to keep track of the number of matches and in an END{...} block if that count is zero then print the single occurrence of NON-EXISTING_DATA_REQUESTED ...
Found a match:
awk -v RS='' -v var=foozoo '
{ $1=$1 }
{ if(match($0,var)) {
# found++ # uncomment if both "is good" AND "is missing" should be considered as "found"
if(match($0,var ".*good"))
{ print var " is good"; found++ } # remove "found++" if the previous line is uncommented
else
{ print var " is missing" }
}
}
END { if (!found) print "NON-EXISTING_DATA_REQUESTED" }
' xx
foozoo is good
foozoo is missing
Found no matches:
awk -v RS='' -v var=monkistrying '
{ $1=$1 }
{ if(match($0,var)) {
# found++
if(match($0,var ".*good"))
{ print var " is good"; found++ }
else
{ print var " is missing" }
}
}
END { if (!found) print "NON-EXISTING_DATA_REQUESTED" }
' xx
NON-EXISTING_DATA_REQUESTED

Answer 2

There's no need to compress your records onto individual lines, that's just wasting time and potentially making the comparisons harder, and by using match() you're treating var as a regexp and doing a partial record comparison when it looks like you just want a string full-field comparison. Try match($0,var) when the input contains badfoozoohere and foozoo given -v var=foozoo to see one way in which the way you're using match() will fail (there are several others). Also since you aren't using RSTART or RLENGTH, using match($0,var) instead of $0 ~ var was inefficient anyway.
$ cat tst.awk
BEGIN { RS="" }
$2 == var {
print var, "is", ( $NF == "good" ? "good" : "missing" )
found = 1
}
END {
if ( !found ) {
print "NON-EXISTING_DATA_REQUESTED"
}
}
$ awk -v var='foozoo' -f tst.awk file
foozoo is good
foozoo is missing
$ awk -v var='monkistrying' -f tst.awk file
NON-EXISTING_DATA_REQUESTED

Answer 3

single-pass awk based solution w/o needing to transform the data:
bytes xC0 \300, xC1 \301, and xF9 \371 aren't UTF-8 valid,
so chances of them appearing in input data are absolutely minuscule
INPUT
name: foobar
data: 123 bad
name: foozoo
data: 123 good
name: foozoo
data: 123 bad
name: zoobar
data: 123 good
name: barzpp
data: 123 bad
CODE (gawk, mawk 1/2, or LC_ALL=C nawk)
{m,n~,g}awk '
BEGIN {
______ = "NON-EXISTING_DATA_REQUESTED\n"
FS = "((data|name): ([0-9]+ )?|\n)+"
RS = "^$" (ORS = _)
___ = "\300"
____ = "\371"
_____ =(_="\301")(__="foozoo")(\
OFS = _)
} ! ( NF *= /name: foozoo[ \n]/) ? $NF = ______\
: gsub(_____ "bad"_, (_)(___)_) + \
gsub(_____ "good"_,(_)(____)_) + gsub("[\1-~]+","")+\
gsub( ___, __ " is missing\n") + \
gsub(____, __ " is " "good\n") + gsub((___)"|"(_)("|")____,"")'
OUTPUT
foozoo is good
foozoo is missing