>> nerdcafe Vetomat 19.7.2010        snufu/fuzzy speach, Zbog report
SHELL BASICS N°2

$ nmap 192.168.1.0

scan the local subnet to check for available hosts – nmap returns all IPs of running machines in the specified subnet. 192.168.1.0-100 scans IPs 1-100.

(you ll need to apt-get install nmap)

$ uptime

Shows when the pc started; how many users; load average; how many processes are running

$ date

gives you back a date and time

$ ncal

to call the calendar

#

Comment sign
to insert a not exacutable text, frequently used for human comunication instead of the normal typing in the terminal that is readed by default as a command to the computer

*

is a jolly to ask for existing files/Directory for example

$ echo D*

gave:
Desktop Dokumente…
(every file with the D as first letter in the directory where we are located)

?
$ fsdsf?

if you dont remember the last letter of a data
for example fsdfz
the command returns the possible files you are searching
like the asterisc but applies only on the last letter in doubt

$

the dollar $ itself
means a variable

|

the pipeline | between commands is to add multiple commands without writing multiple lines in the terminal

""

are to consider the string as text

$ rm filename

removes files – take care there is no restore the file will be deleted!

$ clear

clean the monitor terminal from previous output lines

$ iwlist wlan0 scan

scan for avalaible networks with network interface wlan0 (the 1. wlan card,usually)

$ ps

programs running by everybody

$ ps aux

more info about the running programs

$ ps aux | less

pipe the processes output into “less” – just for easy reading

>

to redirect and copy the command output to another program

>>

append
attach the output left of >> to the end of the file right off >>
for example

$ echo hiho > foobar
$ cat echo >> foobar

will give as output
foobar

foobar

<

\

(escape) to take out special meaning and read the value as text
example echo “mb\”r*” gives the output
mb”r

true is 0
and frequently in programming it is the opposite: true is 1 !!

$ wc

words count

$ wc -l

wordcount –lines

Report of Linux-works shell meeting in Vetomat 19.Juli.2010

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