CODEWITHSUNDEEP
linuxawk
CS1999
CS1999

Reputation: 429

How to use awk for multiple character delimiter?

I have a log file with lines like :

Insert request received from system 1
Modify request received from system 2

I want to get the text after "received from" from the log. The equivalent grep and cut command would be (if it supported multiple character delimiter)

grep "received from" mylogfile.log | cut -d"received from" -f1

How can I recreate this with awk

Upvotes: 0

Views: 341

Answers (4)

RARE Kpop Manifesto
RARE Kpop Manifesto

Reputation: 2819

mawk NF=NF OFS='' FS='^.+ received from ' 

system 1
system 2

Upvotes: -2

Barmar
Barmar

Reputation: 780724

FS can be a string or regular expression in awk.

awk -F' received from ' 'NF > 1 {print $2}' mylogfile.log

You could also use sed to delete everything up to received from:

sed -n 's/.*received from //p' mylogfile.log

Upvotes: 2

The fourth bird
The fourth bird

Reputation: 163207

You could set the field separator to received from and then print the second field if it is there:

awk -F' received from ' 'NF > 1 {print $2}' mylogfile.log

Or using split and check if there is a second field:

awk '{
  n = split($0,a," received from ")
  if (n > 1) print a[2]
}' mylogfile.log

Output

system 1
system 2

Upvotes: 0

Daweo
Daweo

Reputation: 36370

You might do it following way, let file.txt content be

Insert request received from system 1
Modify request received from system 2

then

awk 'sub(/.*received from /,"")' file.txt

gives output

system 1
system 2

Explanation: I use sub string function with 2 arguments: regular expression and empty string, so it does alter current line in-place and return 1 if change made else 0, this value is then used for selection - only lines when change was made are printed. Warning: this solution assumes each line has at most 1 received from , if this does not hold true rightmost one is treated as delimiter.

(tested in GNU Awk 5.0.1)

Upvotes: 1

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