Update cheatsheets

osx/split

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+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# split
+
+> Split a file into pieces.
+> More information: <https://keith.github.io/xcode-man-pages/split.1.html>.
+
+- Split a file, each split having 10 lines (except the last split):
+
+`split -l {{10}} {{filename}}`
+
+- Split a file by a regular expression. The matching line will be the first line of the next output file:
+
+`split -p {{cat|^[dh]og}} {{filename}}`
+
+- Split a file with 512 bytes in each split (except the last split; use 512k for kilobytes and 512m for megabytes):
+
+`split -b {{512}} {{filename}}`
+
+- Split a file into 5 files. File is split such that each split has same size (except the last split):
+
+`split -n {{5}} {{filename}}`