Question

I’m trying to do a loop in a make to exec a remote ssh command to optain the pid of a process to kill it.
Like this:

target:
  for node in 23 ; do \
    echo $$node ; \
    ssh user@pc$$node "~/jdk1.6.0_31/bin/jps | grep CassandraDaemon | awk  '{print \$$1}'" > $(PID); \
    ssh user@pc$$node "kill -9 $(PID); \
  done

But I get:

/bin/sh: 3: Syntax error: ";" unexpected

The issue I think is to store the pid that the remote ssh command returns (it woks well without the > $(PID) )

Answer 1

> redirects into files, not into variables. $() captures in a way you can assign to variables… but is also make syntax, so you need to escape it. You also need to escape it when you use it so that you don’t get the make variable instead (no, you can’t store it in a make variable).

for node in 23 ; do \
    echo $$node ; \
    PID=$$(ssh user@pc$$node "~/jdk1.6.0_31/bin/jps | grep CassandraDaemon | awk  '{print \$$1}'"); \
    ssh user@pc$$node "kill -9 $$PID; \
done

(assuming one of your many, many edits hasn’t changed things too much from when I copied and pasted that to fix it…)