Save / Log "Print Message" to file

#!/bin/bash

## writes a log based upon gcode calls to M120 n
## where n = the occurence to be logged

if [ ! $# -ge 1 ]; then
echo "Usage: M120 n - where n log entry type num"
exit 1
fi

float=$1
int=${float/\.*}

case $int in

1 ) echo "Started machining" > ~/emc2/logfile
date >> ~/emc2/logfile;;


2 ) echo "Toolchange started" >> ~/emc2/logfile
date >> ~/emc2/logfile;;


3 ) echo "Toolchange ended" >> ~/emc2/logfile
date >> ~/emc2/logfile;;


4 ) echo "Stopped machining" >> ~/emc2/logfile
date >> ~/emc2/logfile;;

esac

exit 0

(print,job name 123)

%
(LOGAPPEND,/path/to/your/logfile.log)
(LOG,job name 123)
(LOGCLOSE)
M30
%

The file axis (the function task_run) can be changed like this:...

    def task_run(*event):
        if run_warn(): return

        global program_start_line, program_start_line_last
        program_start_line_last = program_start_line;
        ensure_mode(linuxcnc.MODE_AUTO)
        c.auto(linuxcnc.AUTO_RUN, program_start_line)
        program_start_line = 0
        t.tag_remove("ignored", "0.0", "end")
        o.set_highlight_line(None)
        
        try:
            fl = open('/home/cnc/linuxcnc/logfile', "a")
            fl.write(s.file)
            fl.write(" Cycle Start ")
            fl.write(time.ctime() + "\n")        
            fl.close()        
        except :
            print "nkplogerror"

    def task_stop(*event):
        if s.task_mode == linuxcnc.MODE_AUTO and vars.running_line.get() != 0:
            o.set_highlight_line(vars.running_line.get())
        comp["abort"] = True
        c.abort()
        c.wait_complete()
        time.sleep(0.3)
        comp["abort"] = False
        try:
            fl = open('/home/cnc/linuxcnc/logfile', "a")
            fl.write(s.file)
            fl.write(" Cycle aborted ")
            fl.write(time.ctime() + "\n")        
            fl.close()        
        except :
            print "nkplogerror"