Need explanation for multiple I/O redirection operators.

anindyameister · 01-18-2016, 05:18 AM

Ok, so I'm obviously a shell newbie, so please forgive me if this is a stupid question. As it goes, I've understood the basic I/O redirection but need some explanation about 2 or 3 operators grouped together that I've seen people use. I'll try to explain my level of understanding this way-

1. ">" = Redirect Output
2. "<" = Redirect Input
3. "<<" = Here document used in conjunction with a label
4. ">>" = ???
5. "<<<" = ???
6. ">>>" = ???

Please understand my ignorance and explain the situation to me.

pan64 · 01-18-2016, 05:34 AM

have you checked man bash already (look for redirection)
http://www.tldp.org/LDP/abs/html/io-redirection.html
http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-3.html

anindyameister · 01-18-2016, 05:44 AM

Quote:

Originally Posted by pan64

have you checked man bash already (look for redirection)
http://www.tldp.org/LDP/abs/html/io-redirection.html
http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-3.html

So I figured out the ">>" operator to be "append output", but the "<<<" and ">>>" are not mentioned. I'll keep reading. Thanks.

pan64 · 01-18-2016, 06:26 AM

<<< is a here string (see man page)
>>> does not exist