Shell Programming and Scripting

Hi i have a file called search.txt

Which contains text like

Car
Bus
Cat
Dog

Now i have to create a string from the file which should look like

Car,Bus,Cat,Dog

( appending , is essential part) String must be stored in some variable so i can pass it as argument to some other command.


my attempt so far

while read line
do
var1=$(awk '{print $NF}')
var2=','
var3=$var1$var2
done

cat var3


but no out put .... plz help
Thnx in advance

Code:

$
$ cat f1
Car
Bus
Cat
Dog
$
$ cat f1 | tr '\n' ',' | sed 's/,$/\n/'
Car,Bus,Cat,Dog
$
$

tyler_durden

Hi, try to integrate this in your script:

Code:

awk -F"\n" -v RS="" '{for(i=1;i<=NF;i++) printf "%s%s",(i==1)?"":",",$i}'

Yet another awk script:

Code:

$
$ awk '{s=s","$0}END{sub(/^,/,"",s); print s}' f1
Car,Bus,Cat,Dog
$
$

Or some Perl:

Code:

$
$ perl -nle 'chomp; push @x,$_; END{print join(",",@x)}' f1
Car,Bus,Cat,Dog
$

tyler_durden

hi tyler_durden
plz can u explain the code i am new to awk

awk '{s=s","$0}END{sub(/^,/,"",s); print s}' f1

??

If you are new to awk, then I recommend some reading up:

The GNU Awk User's Guide + lots of playing around with that (and other) scripts.

Everything about awk you seek is there in that one web page.

tyler_durden