[Solved]Writing a file in a rule

[milo (M)]

Hello,
i tried to write a file in a rule with this command:

executeCommandLine("echo t >/home/pi/t.txt",1000) 

But it is not working…?? how can i do this???

[mhilbush (Mark)]

@milo

echo t >/home/pi/t.txt

Are you sure the owner of the openhab process has permissions to write to that directory?

[milo (M)]

No not really…

but i changed it to one openhab user can write and even there nothing happend

[rlkoshak (Rich Koshak)]

How to solve Exec binding problems

One of the most common problems I help people with on this forum is dealing with the Exec binding. So I’m writing this post so I can reference it later. Background When openHAB is installed in the automated way (i.e. via apt-get) an openhab user is created and the service runs under that user. The openhab user has the following attributes: no shell so one cannot log in or su to this user limited rights not a member of sudoers has a home directory in /var/lib/openhab (or /var/lib/openhab2) has…

[milo (M)]

@rlkoshak i read Your Post created the Eule

val results = executeCommandLine("/bin/echo@@'The quick brown fox jumped over the lazy dog.'@@>/etc/openhab2/services/t.txt"

And this ist the Output in the Log

2019-06-19 22:15:00.151 [INFO ] [ipse.smarthome.model.script.execTest] - 'The quick brown fox jumped over the lazy dog.' >/etc/openhab2/services/t.txt

But No File created…whats wrong?

[rlkoshak (Rich Koshak)]

Add a space after the > and experiment with using double quotes and escapes. The echo command is treating everything after the String as part of the text to echo so it isn’t getting piped into the file.

[milo (M)]

Ist ther No better way May bei using Java io writer? Ist there any example available?

Thanks

[noppes123 (Ron)]

@milo

bin/echo@@‘The quick brown fox jumped over the lazy dog.’@@>/etc/openhab2/services/t.txt"

Try ‘|’ instead of ‘>’ (without the quotes).

[mhilbush (Mark)]

@milo

executeCommandLine(“echo t >/home/pi/t.txt”,1000)

I know it doesn’t solve the root cause of the problem, but can you put the command in a shell script and then invoke the shell script from executeCommandLine?

Problem with executeCommandLine() and redirect >

Hello maybe someone can help me with an executeCommandLine() that includes a redirect to store the scanned picture in a file and not the terminal This is my rule: when Item Scanning changed to ON then var String print = "/usr/bin/sudo@@/usr/bin/scanimage@@--resolution=150@@--format=tiff@@>/media/scan/scan_$(/bin/date +%Y%m%d_%H%M%S).tiff" logInfo("debug",print) var String answer = executeCommandLine(print,30000) logInfo("debug",answer) postUpdate(Scanning, OFF) end…

[rlkoshak (Rich Koshak)]

You can use Java IO writer of course. It’s going to be about 20 lines of code or so so whether that’s better than this one line of code is I suppose left up to the coder.

[rossko57]

@mhilbush

can you put the command in a shell script

I can’t remember why (user permissions, path?) but I ended up doing essentially that with little .bat files in a Windows environment; can pass parameters with filename etc., limited skills just could not make it work directly.

[milo (M)]

@rossko57 @rlkoshak
There are 2 ways doing it in an extra batch file or with one command

val String echoResult = executeCommandLine("/bin/sh@@-c@@(echo Alarm Test > /etc/openhab2/services/totalusage.txt) >/dev/null 2>&1; echo $?", 5000)
        logInfo("execTest", echoResult)

But how to I write 2 lines becuase “\n” is not ok for this. Any idea???

[mhilbush (Mark)]

@milo

val String echoResult = executeCommandLine(“/bin/sh@@-c@@(echo Alarm Test > /etc/openhab2/services/totalusage.txt) >/dev/null 2>&1; echo $?”, 5000) logInfo(“execTest”, echoResult)

Did you try echo -e ‘Alarm\nTest’

Hmm. I just tried that and it didn’t work. I got

-e Alarm
Test

But, I tried echo ‘Alarm\nTest’ and got this

Alarm
Test

Odd…

[mhilbush (Mark)]

So, this is the whole line that worked for me.

val String echoResult = executeCommandLine("/bin/sh@@-c@@(echo 'Multi\nLine\nTest' > /tmp/junk.txt) >/dev/null 2>&1; echo $?", 5000)

[milo (M)]

@mhilbush Thanks i forget the high comma

[NCO (E. Gerland)]

For those (like me) who would like to write an item’s state into a separate file:
val String echoResult = executeCommandLine("/bin/sh@@-c@@(echo '" + Loc_Work_N_Dur.state.format("%1$tH:%1$tM") + "\n' >> /var/log/openhab2/workhours.csv)", 5000)

[milty456 (Rich Smith)]

Hrm, what am I doing wrong comparatively speaking. val String echoResult = executeCommandLine(“/bin/sh@@-c@@(echo '” + ZWaveNode_DSB29DoorWindowSensorGen2FrontDoor_BinarySensor.state + now.getMonthOfYear + “/” + now.getDayOfMonth + " | " + now.getHourOfDay + “:” + now.getMinuteOfHour"\n’ >> /var/log/openhab2/FrontDoor.csv)", 5000)

[rpwong (Russ)]

@milty456

Hrm, what am I doing wrong comparatively speaking.

If you’re using OH3, the syntax for executeCommandLine changed. Best to assume that older posts like this are for legacy versions.

Rule issue

The parameters of executeCommandLine have changed. The timeout is now the first parameter and has changed from integer in milliseconds to Duration type. Then are following the command string(s). Before it was one string, now it has to be splitted at every space delimiter or at the @@ delimiter. Your old command: val String results1 = executeCommandLine("ssh root@10.10.10.13 shutdown -r 2>/dev/null", 5000) New command: val String results1 = executeCommandLine(Duration.ofSeconds(5), “ssh”, …

[milty456 (Rich Smith)]

No, I’m using the old OH 2.5.11; thats why i replied to this older thread. Sorry should have specified it though.