your coworkers to find and share information. My actual script is a bit longer than this, but it seems to break when I add the If someone could explain how these file descriptors work and let me know if I am locking the file correctly that would be awesome!The above command tries to obtain an exclusive (write) lock for As soon as the lock can be obtained it executes the If you want to perform multiple commands while obtaining the lock, I suggest to use a lockfile different from the file you are writing to.

Discuss the workings and policies of this site As far as I understand, flock takes different flags (-x for exclusive, -w for timeout), then the file to lock, and then the command to run.

The solution was to use the bash function flock. I appreciate the help.This doesn't help if you want the lock held for the subsequent commands though. Using apps should be effortless. Anybody can ask a question Inside the sub shell flock tries to obtain a lock for file descriptor Thanks for contributing an answer to Stack Overflow! Detailed answers to any questions you might have It only takes a minute to sign up.My goal here is to create a somewhat atomic increment for a file by locking it each time a script tries to access the Note that any variable that you change is local to that shell instance. Free 30 Day Trial By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Learn more about hiring developers or posting ads with us Stack Exchange network consists of 177 Q&A communities including

This utility manages flock(2) locks from within shell scripts or the command line.. Private self-hosted questions and answers for your enterpriseProgramming and related technical career opportunitiesBecause I need to extract an ID from the response to use in the next request. See the examples below for how that can be used. I guess I could rewrite some stuff, it's just getting to be a really long line with the cURL request and whatnot. The third form uses an open file by its file descriptor number.

By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under Featured on Meta I'm AFK for a while. Stack Overflow for Teams is a private, secure spot for you and

Is there a reason I shouldn't do that, or a better way to accomplish the same thing? UNIX is a registered trademark of The Open Group. Flock apps not only provide slash commands for power users, but also a slick GUI interface for those of us who are command-line challenged. So, you can easily click your way through apps on Flock. flock(2) it’s used to apply advisory locks to open files. Linux is a registered trademark of Linus Torvalds. Start here for a quick overview of the site Basically I have a few requests that I need to get info from. flock -x -w 5 ~/counter.txt 'COUNTER=$(cat ~/counter.txt); echo $((COUNTER + 1)) > ~/counter.txt' How would I pass multiple commands to flock as in the example above?. By default, if the lock cannot be immediately acquired, flock waits until the lock is available. Can i use a So the issue is that you cannot read the request out of Yep, this is what I'm looking for. Example: functions/ myfunc/ f1.mcfunction f2.mcfunction f3.mcfunction f4.mcfunction all_fs.mcfunction then on each fx you put whatever you want and then call all of them in sequence on the all_fs.mcfunction one. @EtanReisner Yes, in the question was just a single command was executed. This utility manages flock(2) locks from within shell scripts or the command line. The first and second forms wraps the lock around the executing a command, in a manner similar to su(1) or newgrp(1).It locks a specified file or directory, which is created (assuming appropriate permissions), if it … The Overflow Blog Anybody can answer I have a bash script that makes a cURL request and writes the output to a file called Here is the code that I expect to lock the file, perform the request, and write to the text file:Is this the correct way to go about this? NAME flock - Manage locks from shell scripts SYNOPSIS flock [-sxon] [-w timeout] lockfile [-c] command.... flock [-sxun] [-w timeout] fd DESCRIPTION. it can be used to synchronize access to resources across multiple running processes. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under Stack Overflow works best with JavaScript enabled Featured on Meta You can do multiple functions, then make one calling each one in sequence, so then you can see it as "blocks" in one command in a block. By using our site, you acknowledge that you have read and understand our Flock apps are not just for power users. While flock(2) does solely act on files (actually, on file handles), the file itself need not be the resource to which access is being controlled. The explanation you provided definitely saved me from another hour of headaches Learn more about Stack Overflow the company

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