http://www.kfirlavi.com/blog/2012/11/14/defensive-bash-programming/
A Collection of Less Commonly Used Commands
Over at Hacker News there are often threads about less-traveled UNIX and Linux commands. One particular comment collected a few of the posts, and I decided to parse all of those threads’ commands, plus my own favorite list of obscure entries, and put them in one place. column: create columns from text input tr: translate/substitute/delete input join: like a database join but for text comm: file co
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Why does the C preprocessor interpret the word "linux" as the constant "1"?
Why does the C preprocessor in GCC interpret the word linux (small letters) as the constant 1? test.c: #include <stdio.h> int main(void) { int linux = 5; return 0; } Result of $ gcc -E test.c (stop after the preprocessing stage): .... int main(void) { int 1 = 5; return 0; } Which of course yields an error. (BTW: There is no #define linux in the stdio.h file.)
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