Split variable

[tempest92]

hi, can someone help please !

i have a variable in a script that contains -

name1,name2,name3,name4

i want to split it into as many variables as there are fields i.e.

var1=name1
var2=name2
var3=name3
var4=name4
etc.

thanks !!

 

[Ogzilal]

HI,

IFS=,
V1=name1,name2,name3,name4
set $V1  # set arguments $1 $2 according to the content of V1
while [ $# -ne 0 ]
do
  echo $1
  shift
done

 

[p5wizard]

Isn't that

set -- $V1  # set arguments $1 $2 ... according to the content of V1

HTH,

p5wizard

 

[tempest92]

as always guys.....many thanks !!

 

[AnotherAlan]

You could also do it this way;

IFS=","
count=0

for person in `cat file1` ; do
eval name${count}=$person
count=$(($count+1))
done

But this is a UUOC.

I'm sure that someone will give you an awk one liner. Step forward PHV / Feherke / Anni.

Alan

 

[feherke]

Hi

I would say nothing for the [tt]cat[/tt] in this case, but that incrementing...

for person in [red]$(<derfile)[/red]; do
  eval name${count}=$person
  [red]((count++))[/red]
done

Note that inside the double parenthesis ( () ) the variables are expanded automatically and is faster to just let it happen. I mean, do not put dollar sign ( $ ) in fron t of variable names inside the double parenthesis.

[blue]master #[/blue] time while ((count<100000)); do ((count++)); done
real    0m11.472s
user    0m5.500s
sys     0m4.609s

[blue]master #[/blue] time while ((count<100000)); do count=$(($count+1)); done
real    0m16.362s
user    0m7.890s
sys     0m4.359s

[blue]master #[/blue] time while ((count<100000)); do ((count++)); done
    0.90s real     0.89s user     0.00s system

[blue]master #[/blue] time while ((count<100000)); do count=$(($count+1)); done
    1.02s real     1.01s user     0.00s system

Feherke.

http://rootshell.be/~feherke/

 

[AnotherAlan]

I thought I may have got away with that...;-)

Alan

 

[Ogzilal]

Hi,

You are right P5wizard, if V1 contains some leading '-', they may influnece setting and are lost as chars.

set -- V1 # is more secure

 

[p5wizard]

except you omitted the $-sign

p5

 

[Ogzilal]

Hi,

Sorry, I psted before taking my cup of java!

 

[p5wizard]

There you did it again... ;-)

Fat finger syndrome or hypocafeinia?

p5

HTH,

p5wizard

 

[tempest92]

hi,

IFS=,
V1=name1,name2,name3,name4
set -- $V1 # set arguments $1 $2 according to the content of V1
while [ $# -ne 0 ]
do
echo $1
shift
done

the above worked fine.

i am now running a command that returns to values in 1 variable that look like -

V1=name1 name2

i tried removing IFS and IFS=' ' but i just get name1 name2 twice

thanks !

 

[feherke]

Hi

The [tt]IFS[/tt] holds a list of all separator characters. If you add both comma ( , ) and space ( ), then your string will be split on whichever is encountered.

IFS=', '

Feherke.

http://rootshell.be/~feherke/