Awk – awk concatenate string variable

awkstring

I would like to awk concatenate string variable in awk. How can I do that?
I tried:

BEGIN{
t="."
r=";"
w=t+r
print w}

But I does't work.
Output:

Or I want to add variable and result of function.
Input:

t t t t
a t a ta
ata ta a a

Script:

{
key="t"
print gsub(key,"")#<-it's work
b=b+gsub(key,"")#<- it's something wrong
}
END{
print b}#<-so this is 0

Output:

4
2
2
0#<-the last print

No operator is needed (or used). Your example would be something like

BEGIN{
t="."
r=";"
w=t r
print w}

For related discussion

I would suggest doing all the house-keeping inside awk, this works here with GNU awk:

BEGIN { file = "1" }

{ print | "gzip -9 > " file ".gz" }

NR % 10000 == 0 {
  close("gzip -9 > " file ".gz")
  file = file + 1
}

This will save 10000 lines to 1.gz, the next 10000 to 2.gz, etc. Use sprintf if you want more flexibility in filename generation.

Test data used are primes up to 300k, found here.

wc -lc primes; md5sum primes

Output:

25997 196958 primes
547d527ec50c2799fa6ce96dba3c26c0  primes

Now, if the awk program above was saved into split.awk and run like this (with GNU awk):

awk -f split.awk primes

Three files (1.gz, 2.gz and 3.gz) are produced. Testing these files:

for f in {1..3}; do gzip -dc $f.gz >> foo; done

Test:

diff source.file foo

Output should be nothing if the files are the same.

And the same tests as above:

gzip -dc [1-3].gz | tee >(wc -lc) >(md5sum) > /dev/null

Output:

25997  196958
547d527ec50c2799fa6ce96dba3c26c0  -

This shows that the contents are the same and that the files are split as expected.