Linux shell: Introduction to Flock
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Recently a colleague of mine should run multiple parallel jobs on a server (around 20 in our specific case), every job does “an elaboration” and this can take a time longer or shorter in respect of the others, once a job finishes its task it must read from a text file the first line that indicate the ID of a new job, it removes that ID from the top of the text file and starts to elaborate it. Problem: On a long run (a run of 50K+ jobs) it happens “frequently” that 2 jobs finish at the same time and so both take the same ID causing problems to the whole process. The solution was to use the bash function flock.
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