I'm curious about the specific case of a csh script I have that batch runs a bunch of different build flavors and runs all night. If something occurs to me mid operation, I'd like to go in and add additional commands, or comment out un-executed ones.
That demonstrates that bash is, indeed, interpreting the script "as you go". Indeed, editing a long-running script has unpredictable results, inserting random characters etc. Why? Because bash reads from the last byte position, so editing shifts the location of the current character being read.
Bash is, in a word, very, very unsafe because of this "feature". svn and rsync when used with bash scripts are particularly troubling, because by default they "merge" the results... editing in place. rsync has a mode that fixes this. svn and git do not.
Break your script into functions, and each time a function is called you source it from a separate file. Then you could edit the files at any time and your running script will pick up the changes next time it gets sourced.
An interesting side note - if you are running a Python script it does not change. (This is probably blatantly obvious to anyone who understands how shell runs Python scripts, but thought it might be a useful reminder for someone looking for this functionality.)
If this is all in a single script, then no it will not work. However, if you set it up as a driver script calling sub-scripts, then you might be able to change a sub-script before it's called, or before it's called again if you're looping, and in that case I believe those changes would be reflected in the execution.
usually, it uncommon to edit your script while its running. All you have to do is to put in control check for your operations. Use if/else statements to check for conditions. If something fail, then do this, else do that. That's the way to go.
Scripts don't work that way; the executing copy is independent from the source file that you are editing. Next time the script is run, it will be based on the most recently saved version of the source file.
It might be wise to break out this script into multiple files, and run them individually. This will reduce the execution time to failure. (ie, split the batch into one build flavor scripts, running each one individually to see which one is causing the trouble).
I tried the solution described by Rae: Uninstalling "Visual Studio Tools for Applications 2015" and subsequently repairing "Visual Studio Tools for Applications 2012". This solution worked for VS 2013, after that, all scripts are opened in VS 2012. But after that, in VS 2015 SSIS Projects, I could no longer edit Script Tasks. (Error message "Could not load file or assembly 'Microsoft.VisualStudio.Tools.Applications, Version=14.0.0.0,...")
My SSIS project in VS2012 would try opening scripts in a VS2015 instance. After uninstalling VSTA 2015, VS2012 now successfully opens the scripts in a VS2012 instance.
I install Debian a lot. To do this I have a fully-automated preseed.cfg; at the end of the preseed, it downloads and runs a postinstall.sh script from my TFTP server, which does some additional customization.
This works great, and I'd like to automate this process by adding it to the postinstall.sh script. However, I can't figure out how to pass the file contents to systemctl edit via a bash script. How can I do this?
Since I have not found how to use systemctl edit in a script yet, best practice would be to simulate the systemctl edit sddm command and place the override in the /etc/systemd/system directory, as service units in /usr/lib/systemd/system could be changed when packages are upgraded:
I have a series of scripts that call each other in tandem. For simplicity's sake I'll call them scripts A, B, and C. Script A carries out a series of statements and then pauses, it then executes script B, then it pauses, then it executes script C. In other words, the series of steps is something like this:
I know from experience that if I run script A until the first pause, then make edits in script B, those edits are reflected in the execution of the code when I allow it to resume. Likewise if I make edits to script C while script A is still paused, then allow it to continue after saving changes, those changes are reflected in the execution of the code.
I don't know of any wording in the Posix standard which actually requires the possibility of appending to a script file while the file is being executed, so it might not work with every Posix compliant shell, much less with the current offering of almost- and sometimes-posix-compliant shells. So YMMV. But as far as I know, it does work reliably with bash.
The shell will read the script by blocks, so likely read both commands, interpret the first one and then seek back to the end of cmd1 in the script and read the script again to read cmd2 and execute it.
The shell will have to read up to the closing }, store that in memory and execute it. Because of the exit, the shell will not read from the script again so you can edit it safely while the shell is interpreting it.
There is really no safe way to modify the script while it is running because the shell can use buffering to read the file. In addition, if the script is modified by replacing it with a new file, shells will typically only read the new file after performing certain operations.
Often, when a script is changed while executing, the shell ends up reporting syntax errors. This is due to the fact that, when the shell closes and reopens the script file, it uses the byte offset into the file to reposition itself on return.
You could get around this by setting a trap on your script, and then using exec to pick up the new script contents. Note however, the exec call starts the script from scratch and not from where it has reached in the running process, and so script B will get called (on so forth).
This will continue to display the date on the screen. I could then edit my script andchange date to echo "Date: $(date)". On writing that out the running script still just displays the date. How ever if I send the signal that I set the trap to capture, the script will exec (replaces the current running process with the command specified) which is the command $CMD and the arguments $@. You can do this by issuing kill -1 PID - where PID is the PID of the running script - and the output changes to show Date: before the date command output.
You could store the "state" of your script in an external file (in say /tmp), and read the contents to know where to "resume" on the when the program is re-exec'ed. You could then add an additional traps termination (SIGINT/SIGQUIT/SIGKILL/SIGTERM) to clear up that tmp file so when you restart after interrupting the "Script A" it will start from the beginning. A stateful version would be something like:
I have created a new toolbox (the new .atbx format, not the older .tbx) that contains a script that references a .py file that is stored in the same directory as the toolbox. For some reason, I cannot edit the metadata of the script like I can in the older .tbx format. This means I cannot update the tool tips that show in the actual tool interface.
I encountered this recently and opened a support issue. They told me it's a known bug. (They've not yet given me an ETA on a patch or fix yet.) #BUG-000146430
This is a really serious issue, as it prevents you from publishing GP services or sharing in a GP package from tools in an atbx. You're not allowed to publish tools without metadata, and you can't add metadata to the tools. This is how I found out about the bug. Luckily the logic of the tools were in Python scripts, so recreating the toolbox portion in the legacy format wasn't too difficult. I'd hate to be the person that had to recreate all their model builder models because of this bug.
I am having trouble at a client site where I am unable to start the script editor. Whenever I try (Ctrl E, or File, Edit Script or click on the icon), QlikView just freezes. The only thing I can do is end the application in Task Manager.
I did as you suggested and deleted the registry Windowpos folder. Restarted QlikView and my problem was resolved. It would seem that the script editor window must have been positioned behind the QlikView window instead of in front.
I have an application that's been working, but I want to tweak the script I'm using as my detection method, but I can't edit the script. I open the script editor, and type but nothing happens. I've verified permissions (Full disclosure: I've verified permissions to things before and they still end up being permissions issues).
AWS Glue ETL scripts are coded in Python or Scala. While all job types can be written in Python, AWS Glue for Spark jobs can be written in Scala as well. When you automatically generate the source code logic for your job in AWS Glue Studio, a script is created. You can edit this script, or you can provide your own script to process your ETL work.
For the .urp inside the VM, what is the accessory that we used to see the file other than opening that with Polyscope.
In connection to this after running the .script file will that also generates the .txt .urp files.?
Yeah its hard to edit a saved .script file that was straight from the pendant. What I have been doing is Uploading the .script file in chunks the same way Nrivas described. What error are you getting when trying to use your .script file? You might be duplicating the code the initializes the cobot.
In my case, after I change the .script to create a different program and put it back to UR with the original .urp file.
the program will still be the same program as the original .urp file, not the .script program I created.
So, just having a little UR program that just runs a .script is the easiest way for now.
This .script you can edit it directly if you have any remote client active on your controller, or you can copy-paste it back and forth with a usb or through ssh.
The Edit Script dialog uses autocomplete, so when typing, the program predicts what is wanted to type without having to type it completely. The predictions include words that are part of the script syntax. The script is also color coded by syntax components. It may be customized by choosing Tools and Editor Preferences.
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