Question

I have a function in bash say parse which takes one argument and function name is f. My file to be processed is somewhat like

a@b@c@
a@d@e@g@
m@n@
t@

I want to give the output as

a@f(b)@f(c)@
a@f(d)@f(e)@f(g)@
m@f(n)@
t@

That is apply function f to all except the first. Any clues so how can I do this?

Answer 1

maybe this is what you want?

e.g. you have a script called sqr.sh:

kent$  cat sqr.sh
#!/bin/bash
echo $(($1*$1))

now you want to apply the function above on your input:

kent$  echo "foo@2@3@4@
0@10@20@
x@"|awk -F'@' -v OFS=@ '{for(i=2;i<=NF;i++) if($i) "./sqr.sh "$i|getline $i; print}'

foo@4@9@16@
0@100@400@
x@