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Unix-like operating systems provide a rich set of command-line tools according to various standards that allow solving very many general problems on the command line, particularly well suited to filte...

If you’re at a terminal or writing a script and need to do some quick integer calculations, Bash offers arithmetic expansion with the $((...)) syntax. The usual arithmetic operations of addition, subt...

This entry is part 1 of 7 in the series Unix as IDE. This series has been independently translated into Chinese, Russian, Turkish, and Korean, and formatted as an ebook. Newbies and experienced profes...

TERM environment variable from within the shell, doing something like this: $ TERM=xterm-256color This misinformation sometimes extends to suggesting that users put the forced TERM change into their...