The real explanation: stackoverflow.com/questions/1780599/what-is-the-meaning-of-posix/31865755#31865755
Overview by Ciro Santilli at: superuser.com/questions/284342/what-are-path-and-other-environment-variables-and-how-can-i-set-or-use-them/1864687#1864687
This section is about POSIX environment variable that have special effects.
They are documented by POSIX at: pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08
Some mentions by Ciro Santilli at: superuser.com/questions/284342/what-are-path-and-other-environment-variables-and-how-can-i-set-or-use-them/1864687#1864687
Non-POSIX only here.
If you are a programmer,
grep becomes a verb: "to grep" means "to search text files", much like "to Google" means "to search random stuff online".This is a weak point of grep, it can't handle large lines that don't fit fully into memory:
- superuser.com/questions/1703029/is-there-a-limit-for-a-line-length-for-grep-command-to-process-correctly what is the grep line limit?
- unix.stackexchange.com/questions/223078/best-way-to-grep-big-binary-file/758528#758528 Ciro's
bgrepcanon - large not required but mentioning bgrep anyways:
- superuser.com/questions/1368263/use-grep-for-a-long-line-to-get-the-part-of-the-line/1811969#1811969
- unix.stackexchange.com/questions/217936/equivalent-command-to-grep-binary-files/758544#758544
- stackoverflow.com/questions/2034799/how-to-truncate-long-matching-lines-returned-by-grep-or-ack/77263826#77263826
- stackoverflow.com/questions/9988379/how-to-grep-a-text-file-which-contains-some-binary-data leaving this one alone for now
- stackoverflow.com/questions/65674717/how-to-check-if-a-binary-file-is-contained-inside-another-binary-from-the-linux search pattern from file
Getting started tutorial: unix.stackexchange.com/questions/223078/best-way-to-grep-a-big-binary-file/758528#758528
Articles by others on the same topic
An operating-system family with process, file and pipe abstractions. The traditional discretionary file-permission model separates owner, group and other users and read, write and execute rights. Individual Unix systems can add richer access control lists and other protection mechanisms.
// Destination: computer-science.bigb