Java processbuilder - how to execute xargs command

Question

I'm trying to execute the following command using java processbuilder

ls | xargs cat > pathtonewFile

Currently my code is

 String command="ls | xargs cat >t"

 ProcessBuilder probuilder = new ProcessBuilder(command);
 probuilder.start()

Currently this executes without an error but a new file is not created.

I've tried below based on another post here: Problem Using Java ProcessBuilder to Execute a Piped Command

   ProcessBuilder probuilder = new ProcessBuilder("sh", "-c", "ls  | xargs cat >        pathtonewfile");

The command executes but creates a 0 byte file.

It strikes me that this problem is most likely to be in the command that you are executing. Try running the same command from a shell prompt. One possibility is that the command is being run with the wrong current directory. — Stephen C
– Stephen C, Commented Aug 16, 2012 at 2:44

Bl H · Accepted Answer · 2012-08-16 02:40:13Z

0

Try adding the file extension to the path, or adding the file extension to the name of the file.

answered Aug 16, 2012 at 2:40

Bl H

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2 Comments

user1127081 Over a year ago

Stephen C - if I execute from the command line it works as expected

user1127081 Over a year ago

I figured out the problem the command ProcessBuilder probuilder = new ProcessBuilder("sh", "-c", "ls | xargs cat > pathtonewfile"); works the problem was the folder where ls was executed contained a folder which was causing an error. The fix was to add a filter to ls (ls *.txt")

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