CODEWITHSUNDEEP
linuxbashscripting
Callyn Villanueva
Callyn Villanueva

Reputation: 77

Bash Scripting: Initialzing a path with a text file to a variable & iterating the list in the text file

I'm currently learning the basics of bash scripting (coming from a Pythonic background) and It seems I've run into an interesting situation in which I need a bit of explanation with.

My goal is to create a Path variable that contains a text file. I use an if-statement to check whether the file exists in the directory. If it exists, It will print "It exists".

Then I created a for-loop to print out the elements in the file list. When I execute the program, there is no output and no errors being thrown.

Any help or explanation would be much appreciated! Here is the code below:

#!/bin/bash
veggieFile=/home/lynova/Potato/hewwo.txt 

if [ -e veggieFile ]; then 

    echo "File exists"

    for VEGGIE in $(cat veggieFile  ); do

        echo "Veggies are ${VEGGIE}"

    done

fi

Upvotes: 0

Views: 32

Answers (1)

chepner
chepner

Reputation: 530920

You are checking if the file veggieFile exists, not the file whose name is stored in the variable veggieFile. You need to expand the name:

if [ -e "$veggieFile" ]; then
    echo "File exists"
    while IFS= read -r veggie; do
        echo "Veggies are $veggie"
    done < "$veggieFile"
fi

See Bash FAQ 001 for more information on why I used a while loop instead of a for loop. Also, all-caps names are reserved; use lower- or mixed-case names for your own variables.

A possible source of confusion might be in how quotes are used. In Python, veggieFile would be a variable whose value is used, while "veggieFile" is a literal string. In shell, though, all strings are literal strings; quotes are only used to escape the contained characters. For example, the quoted word "foo bar" is equivalent to the foo\ bar. You need to use $ to get the value of a variable.

Upvotes: 1

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