GLOBBING

ls *         deixnei ola ta arxeia
ls a*        deixnei ola ta arxeia pou 3ekinan me a
ls [1-9]*    deixnei ola ta arxeia pou 3ekinan me ena psifio apo to 1 eos to 9
ls [!1-3]*   deixnei ola ta arxeia pou den 3kinane me psifia apo to 1 eos to 3
ls [a-z].txt deixnei ola ta arxeia pou 3ekinan apo mikro gramma kai teleionoun se .txt
ls ?.txt     deixnei ola ta arxeia pou 3ekinan apo enan xaraktira kai teleionun se .txt

PERMISSIONS

ls -l
drwxr-xr-x 27 michael michael  192512 May 10 16:32  Pictures/


einai arxeio (-) i fakelos (d)
|                              megethos
| Permissions                    |
V                                V    
drwxr-xr-x 27 michael michael  192512 May 10 16:32  Pictures/
                                                      ^
                                                      |
                                                    onoma


PERMISSIONS (ADEIES)

idioktiti
    omadas
        ypoloipwn
rwx rwx rwx

r = read (anoigma/diavasma)
w = write (epe3ergasia)
x = execute (tre3imo)

0 = --- (kamia adeia)
1 = --x (kamia execute)
2 = -w- (mono write)
3 = -wx (write & execute)
4 = r-- (mono read)
5 = r-x (read & execute)
6 = rw- (read & write)
7 = rwx (oles oi adeies)


ALAGI PERMISSIONS (me to chmod)
chmod 777 file.txt     (rwx rwx rwx)
chmod 775 file.txt     (rwx rwx r-x)
chmod u+x file.txt      (deinei adeia execute gia ton idioktiti)
chmod g+x file.txt      (deinei adeia execute gia tin omada)
chmod a+x file.txt      (deinei adeia execute gia olous)
chmod -R u+x fakelos/   (-R gia ola ta arxeia se fakelo)



UMASK

Otan dimiourgeis arxeio me to touch, exei automata kapoies
adeies. Gia na alla3eis tis default adeies ton arxeion pou
dimiourgeis, xrisimopoieis to umask, to opoio einai sa to chmod, alla oi arithmoi einai akrivos oi antithetoi. PX

umask 077    allagi rithmisewn etsi oste ola ta mellontika arxeia na exoun oles tis adeies gia ton idioktiti, alla kamia gia tous ypoloipous



PIPING

To pipe symbol ( | ) steilnei to output (keimeno/apotelesma) tou propgrammatos. P.x
ls | wc -l         To ls deinei to output sto wc, pou metraei tis seires me to -l  (i -b gia bytes, -c gia xaraktires)


ls | head -10      Diavase tis 10 protes seires (10 prota arxeia)
ls | tail -5       Diavase tis 5 teleftaies seires (10 teleftaia arxeia)



EGREP, REGEX

egrep "hi" file.txt    emfanizei oles tis seires tou file.txt me "hi"
ls | egrep hi          emfanizei ola ta arxeia ston fakelo me "hi" sto onoma
ls | egrep


To grep xrisimopoiei regex
.     enas xaraktiras
x|y   x i y
[xyz] ena apo ta mesa
[x-z] to idio
[^xyz] antistrofo
\n     thetikos arithmos
*     0 i perissoteres to perissoteres fores to proigoumeno
^ arxi
$ telos

px

egrep .. file.txt            briskei oles tis seires me dio xaraktires
egrep [abc].* file.txt       briskei oles tis seires pou 3ekinoun me abc
egrep hi$ file.txt           briskei oles tis seires pou teleiwnoun me hi
egrep ^hi file.txt           briskei oles tis seires pou arxizoun me hi