Merge pull request #517 from Cvetomird91/ulimit

pages/linux/ulimit.md

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+# ulimit
+
+> Get and set user limits
+
+- get the properties of all the user limits
+
+`ulimit -a`
+
+- get hard limit for the number of simultaneously opened files 
+
+`ulimit -H -n`
+
+- get soft limit for the number of simultaneously opened files 
+
+`ulimit -S -n` 
+
+- set max per-user process limit 
+
+`ulimit -u 30`