Can i use awk in java?

Question

I tried the code below but it doesn't work. Nevertheless, if I try to cat the file, it works and prints the whole content of the file.

But the reason I tried using awk is that I don't need the whole content, I only need some parts of each line.

Runtime r = Runtime.getRuntime();
Process p = r.exec("awk -F\":\" '/in/ {print $3}' file.awk"); 
p.waitFor();
BufferedReader in=new BufferedReader(new InputStreamReader(p.getInputStream()));
System.out.println("esto es una \"prueba\"");
String valor = "";
while ((valor = in.readLine())!= null){
    System.out.println(valor);
}

It isn't really an alternative to `awk`, but you can use `Pattern` / regex matcher to only print matching characters. — Roland, Jan 24 '17 at 08:55
This topic is somewhat related : http://stackoverflow.com/questions/26211696/executing-awk-command-in-java — Arnaud, Jan 24 '17 at 08:57

score 2 · Answer 1 · answered Jan 24 '17 at 09:07

2

jawk

is the java implementation of awk. Please follow this link for an overview: http://jawk.sourceforge.net/

answered Jan 24 '17 at 09:07

Yeasir Arafat Majumder

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How do you suggest that JAWK be used to solve the problem? – Tom Fenech Jan 24 '17 at 10:01

score 2 · Accepted Answer · edited Jan 24 '17 at 14:50

2

Why would you want to run awk for a problem that is so trivial? If the line contains the string "in", split it on ":" and return the third field:

BufferedReader reader = new BufferedReader(new FileReader(filename));
while(String line = reader.readLine()) {
    if (line.indexOf("in") >= 0) {
        String[] fields = line.split(":");
        System.out.println(fields[2]);
    }
}

edited Jan 24 '17 at 14:50

fedorqui

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answered Jan 24 '17 at 13:41

Michael Vehrs

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it's not that simple, that code wouldn't work in my app, i could code my own "awk", but it would take a time i could spend coding more important things. – Jose María López Bonaque Jan 24 '17 at 14:12
I've been thinking and maybe you are right, maybe i overdid my code, thanks ^^ – Jose María López Bonaque Jan 24 '17 at 14:32

Can i use awk in java?

2 Answers2