May 2005
Intermediate to advanced
666 pages
21h 5m
English
book
SSH, The Secure Shell: The Definitive Guide, 2nd Edition
by Daniel J. Barrett, Richard E. Silverman, Robert G. Byrnes
Content preview from SSH, The Secure Shell: The Definitive Guide, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Character Sets for Egrep and ZSH_FILEGLOB
A character set starts with [ and ends at non-escaped ] that is not part of a POSIX character set
specifier and that does not follow immediately after [.
The following characters have a special meaning and need to be escaped if meant literally:
-(minus sign)A range operator, except immediately after
[where it loses its special meaning.^or!(latter applies to ZSH_FILEGLOB)If immediately after the starting
[, denotes a complement: the whole character set will be complemented. Otherwise, literal.[:alnum:]Characters for which
isalnumreturnstrue(see ctype.h).[:alpha:]Characters for which
isalphareturnstrue(see ctype.h).[:cntrl:]Characters for which
iscntrlreturnstrue(see ctype.h).[:digit:]Characters for which
isdigitreturnstrue(see ctype.h).[:graph:]Characters for which
isgraphreturnstrue(see ctype.h).[:lower:]Characters for which
islowerreturnstrue(see ctype.h).[:print:]Characters for which
isprintreturnstrue(see ctype.h).[:punct:]Characters for which
ispunctreturnstrue(see ctype.h).[:space:]Characters for which
isspacereturnstrue(see ctype.h).[:upper:]Characters for which
isupperreturnstrue(see ctype.h).[:xdigit:]Characters for which
isxdigitreturnstrue(see ctype.h).
Example
[[:xdigit:]XY]
is typically equivalent to:
[0123456789ABCDEFabcdefXY] .
It is also possible to include the predefined escaped character sets into a newly defined one, so:
[\d\s]
matches digits and whitespace characters.
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.