CODEWITHSUNDEEP
bashawk
theborngeek
theborngeek

Reputation: 151

Using AWK for a variable inside a loop

So I get some URL's from my other team and I need to identiy a defined pattern in that URL and save the value after the pattern inside a variable.

Can this be achieved ?

**Input file: Just an example**
https://stackoverflow.com/questions/hakuna
https://stackoverflow.com/questions/simba

I wrote a simple for loop for this purpose

for i in `cat inputFile`
do
    storeVal=awk -v $i -F"questions/" '{print$2}'
    echo "The Name for the day is ${storeVal}"
    length=`secondScript.sh ${storeVal}`
    if [[ $length -gt 10 ]]
    then
        thirdScript.sh ${storeVal}
    elif [[ $length -lt 10 ]]
    then
        fourthScript.sh ${storeVal}
    else
        echo "The length of for ${storeVal} is undefined"
done

Desired Output:

The Name for the day is hakuna
The length of for hakuna is greater than 10
Command1 hakuna executed
Command2 hakuna executed

The Name for the day is simba
Command1 simba executed
Command2 simba executed

And extra point to be noted.

The reason why I need to store the awk cut value in a variable is because I need to use that variable in multiple places with the loop.

Upvotes: 1

Views: 431

Answers (2)

Quasímodo
Quasímodo

Reputation: 4004

Since you want to extract all the string after the questions/ bit, you can simply use shell pattern substitution for that.

while IFS= read -r line; do
    storeVal=${line##*questions/}
    echo "The Name for the day is ${storeVal}"
done < 'inputFile'

Sample input file:

$ cat inputFile
https://stackoverflow.com/questions/hakuna
https://stackoverflow.com/questions/simba
https://stackoverflow.com/questions/simba/lion

Output of script:

The Name for the day is hakuna
The Name for the day is simba
The Name for the day is simba/lion

Upvotes: 0

Tom Fenech
Tom Fenech

Reputation: 74596

Since it sounds like you want to run a command for every line in the input file, you can just use the built-in functionality of the shell:

while IFS=/ read -ra pieces; do
  printf '%s\n' "${pieces[@]}" # prints each piece on a separate line
done < inputFile

If you always want the last part of the url (i.e. after the last /) on each line, then you can use "${pieces[-1]}":

while IFS=/ read -ra pieces; do
  variable=${pieces[-1]} # do whatever you want with this variable
  printf 'The Name for the day is %s\n' "$variable" # e.g. print it
done < inputFile

Upvotes: 1

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