Shell Scripting Tutorial-13 Cut Through Your Files Video Lecture - Shell

hello guys my name is mother and welcome
to my channel this is the 13th tutorial
in this series of tutorials on UNIX
shell scripting now in this tutorial
we're gonna check out the cut command
cut just like sword is used for
filtering text and well let me first
create a text file and then I'll
demonstrate to you what cut is used for
I'm gonna use cat c'mon and I'm gonna
create a file called players and what
I'm gonna do in this pile is I'm going
to create well it's gonna be some sort
of a table and I'm basically gonna have
three columns in it the first column is
going to have name the next column is
going to have sport and the next poem is
going to have age that's going to be the
final column and in the next line I'm
gonna just input name of some players I
know Sir Roger Federer he plays tennis
and his age is what 30 Rafael Nadal
again type in his full name he plays
tennis
his age is 25 he's five years younger
and I made a typo there in his name
the Dolphins would like that and next
I'm gonna put in Tiger Woods he plays
golf and he is worth thirty seven years
old
well the ages don't have to be correct
I'm just typing in whatever is coming to
my mind Michael Phelps this dog is
really annoying me ready to do something
about this okay so this guy he is a
swimmer and I wonder whether he's gonna
contest in 2012 Olympics or not I have
no information but I would want to know
he's 27 years old and lastly I put in
Kobe Bryant because he's been in news he
plays basketball and he is 34 years old
so that's it my file is ready I'm gonna
press control-d and I'll see how my file
looks by typing in cat players and there
you go I have my data organized under
three columns the first is name the
second is sport in the last one is age
Roger Federer plays tennis is ages 30
and Kobe Bryant plays basketball in his
age is 34 well now we are going to see
what card can be used for suppose if I
just want to see from this file if I
just want to see the name of the player
and his age
if I do not want to know the sport that
he plays then what I'm gonna do is I'm
gonna use cout and the default delimiter
that cut C's in a file is the tab
character so you know that's what it
used as it uses as a separator so if I
have Roger spaced Federer than it would
treat Roger and Federer as items or
entities in two different cells but in
this file we don't have tab as the
character as a separator we have a - as
a delimiter as you must have noted when
I created the file you can basically
have any character any alphabet - a
colon or a semicolon or even a comma if
you want if you have a CSV file that is
a comma separated value file then you
will have a comma as your delimiter so
what we would first have to do is we
would have to inform cut that in this
case our delimiter is not a tab but
something else and for that we'd have to
use the option hyphen D so I'll type in
- D
in double quotes I'll type in the
character that I have used as a
delimiter which in this case is a -
there you go
the next thing is I want to cut out
fields from my files right so I'll type
in hyphen F which would mean that I want
to extract the field and then I'll have
to type in the numbers of the fields in
my files that I want to view so if I
just wanted to see the names and let's
say the ages so you know I would have to
type in 1 comma 3 we have just three
fields in our file one is named the
second is sport and the third is age if
you had more than you could have listed
more here but I'm just gonna filter out
name and age so 1 comma 3 and then you
have to type in the name of the part
that you want to cut through which is
flares if I press ENTER then I see that
I get the name age as the first row the
second row displays Roger and 30 as his
age the next row displays Rafael Nadal
and 25 in the last one displays Kobe
Bryant in 34 and you can see that the
second field which was of sport is not
being displayed but if I wanted to see
just a sport field and not the name and
the age field and I can just type pain -
f2 players if I would type if I would
press ENTER then I can see that I just
have my sports field and I have 1 2 3 4
5 rows and this basically does not tell
you anything but it comes from the same
five players so there you go that's one
application of card will be discussing
card for sure in detail when we get to
shell programming but this should get
you started and you can explore on your
own if you want you can search for
options that come with carrot you can
also see it's health page or the man
page we haven't spoken about the man
c'mon yet but I will be doing that in
one of the near tutorials so thank you
for watching this one and hope to see
you in the next tutorial and please
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