Using AWK for a variable inside a loop

Question

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.

What does second value of the URL mean? For example, what is it in <stackoverflow.com/questions/ask/xxx/yyy>? — Quasímodo
– Quasímodo, Commented Apr 8, 2020 at 12:31
@Quasímodo I've re-edited, I took out the first line stating the second value, it was confusing, I simpliied it to a better extent. — theborngeek
– theborngeek, Commented Apr 8, 2020 at 13:43
@theborngeek : You are talking about awk, but your program never executes awk! The line storeVal=awk -v $i -F"questions/" '{print$2}' tries to execute the command -v, and places into the environment for this command the variable storeVal, which is set to the string awk. Likely you were thinking about something like storeVal=$(awk ....) — user1934428
– user1934428, Commented Apr 8, 2020 at 13:45

Tom Fenech · Accepted Answer · 2020-04-08 12:47:14Z

1

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

edited Apr 8, 2020 at 12:47

answered Apr 8, 2020 at 12:40

Tom Fenech

75.1k13 gold badges119 silver badges154 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Quasímodo · Accepted Answer · 2020-04-08 14:11:50Z

0

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

answered Apr 8, 2020 at 14:11

Quasímodo

4,09418 silver badges28 bronze badges

Collectives™ on Stack Overflow

Using AWK for a variable inside a loop

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related