Unix Power Tools Study Notes Ch1

Unix Power Tools Study Notes Ch2

Sally posted @ Mon, 02 Nov 2015 23:34:47 -0700 in Unix Study Notes , 1280 readers
// How to read manpages in Unix
 
more — a pager, which allows you to page through the results. 
 
man 
-s section
-k  equi to apropos command. this option searches database files for matches of a given keyword
 
Your system may have a config file for man named /etc/man.config
 
MANPATH    —environment variable
 
…………..
whatis
whatis cat 
equi to man -f on most systems.
 
whereis
finding where a command is located
 
-b only report the executable name
-m only report the location of the manual page
-s only search for source files
-u only issue a report if any of the requested info is missing
 
cd /usr/man/man1
egrep -i ‘colum|chop’ *
 
awk, cut both handle columns 
 
if a file is compressed, use grep -Z 
 
sed command adds the name to the start of every line grep outputs. 
 
less - see the output a screenful at a time and quit (with q) when you’re done. 
 
col -b removes the overstriking (for formatted manpages)
 
Each computer on a network needs a name. uname -n shows you this name. 
 
type sort (which version of sort am I using?)
type -all sort 
 
whence — similar to type
type and whence are built into shell
 
which —external command, it works everywhere. Because it isn’t built in shell, it can’t always ind out about aliases defined in your current shell.
 
ls -li `which man` `which apropos` `which whatis`
apropos, man and whatis are just one executable file that has three hard links. (in Darwin, they are separate entities; on my system, they are also separate)
 
………tty…………….
tty — a Unix device file that handles input and output for your terminal, window, etc. Each tty has its own filename. 
run tty command at shell tells which tty you are on. 
 
$ tty
/dev/tty01
you can tell other users to type write your-username tty01
 
a system file like /etc/ttys lists which ttys are used for that. 
 
……………who…………….
who — lists the users logged on to the system now. 
search the output of who with grep 
 
who | grep “^hal “       ….where is hal logged on? 
 
 
A tty is a native terminal device, the backend is either hardware or kernel emulated. A pty (pseudo terminal device) is a terminal device which is emulated by an other program (example: xterm , screen , or ssh are such programs). A pts is the slave part of a pty.
 
……..info……..
info is based on a hypertext link linkage between topic components.
info info

 
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