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ulimit is trying to increase the the maximum usage of those resources above that configured for the entire system by sysctl. Furthermore it's not actually possible to configure Linux with an unlimited number of some resources, such as open files. Note that unlimiting all resources is not a good idea -- do you really want a few gigabytes of core dump should ...


See the csh man page, which documents the limit and unlimit builtins. The unlimit is to remove all limit, and the limit is the print the current limits. I'm guessing whoever wrote this ran into some sort of resource limit issue at some point and put these in as a defensive means to ensure there were no limits and print what they were if there were any.

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