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diff -e produces an ed program. ed is the ancestor of sed.

For daily tips on regular expressions, follow Regular Expression.

Current UTC time: date -u

As an address in sed, $ is the line number of the last line in a file.

Hexadecimal dump of a file: od -x <file>

No disrespect to Linus Torvalds, but this guy is the greatest geek alive 🫡 Created UNIX in 1971 when he was 28 years old. Created Go in 2009 when he was 66 years old😲 He also developed the B programming language (which led to C), created UTF-8 encoding (making international

Randomly sample a file from the shell johndcook.com/blog/2019/05/2…

A sed command can have no address, one address, or a pair of addresses separated by a comma.

wc has options to only show character (-c), word (-w), or line (-l) counts. [The option -c counts BYTES, which in ASCII text is equivalent to characters. Use -m to count Unicode characters.]

Change font size in Emacs: C-x C-+ to increase, C-x C-- to decrease.

OS X command line utilities mitchchn.me/2014/os-x-term…

German ergonomic workstation concept from 1969.

In awk, the opening brace of a BEGIN or END block must be on the same line as the keyword.

tcgrep: grep rewritten in Perl johndcook.com/blog/2021/03/0…

The utility 'file' reports a file's type. With the option -z it will try to look inside zipped files.

The awk variable $1 contains the first field in a record, $2 the second, $3 the third, etc. $0 contains all fields.

Working with wide text files at the command line johndcook.com/blog/2019/08/2…

If a sed command has no explicit address, the command is applied to all lines.

Using Emacs as your file manager in Guix lynn.sh/guix-emacs-fil…