Unix tool tip
@UnixToolTip
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Tips on Unix utilities and related topics from @JohnDCook.
Joined August 2011
'The enjoyment of one's tools is an essential ingredient of successful work.' -- Donald E. Knuth.
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'It is easier to port a shell than a shell script.' -- Larry Wall.
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The comm utility lets you compute set differences and intersections.
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The sed command p prints. For example, print lines 3 through 7 of a file: sed -n '3,7p' somefile.
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Sort a file in case-insensitive order: sort -f. 'f' for 'fold,' i.e. fold upper and lower case together.
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Kill a line in Emacs from anywhere on that line: M-shift-backspace.
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Output a file, displaying non-printing characters: cat -v.
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The name 'awk' comes from the initials of its creators: Aho, Weinberger, and Kernighan.
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Using `make` to compile C programs (for non-C-programmers).
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The option -E or --ignore-tab-expansion tells diff to ignore the distinction between tabs and spaces.
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Split a text file into files with 50 lines each: split --lines=50 foo.txt.
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