How to input string generated from linux command to variable?

Question

I am facing some minor problems when coding linux shell scripts.

My codes are below and I am struggling to input my modified string names to the variable named "fileName" as shown in below. And then, I commanded echo to identify the previous code is working well. However, it outputs nothing.

How to resolve this issues?

for file in ./*.txt
do
fileName=$file | rev  | cut -d. -f2 | rev
     echo {$fileName}
done

As I said, echo{$fileName} didn't output the words that I wanted to extract.

I look forward to your helpful advice :)

To assign a modified value to fileName, you need something like fileName=$(echo "$file" | rev | cut -d. -f2 | rev). This echoes the value in $file to the sequence of commands and captures the output in the variable. In Bash, you could use a here string instead of echo. — Jonathan Leffler
– Jonathan Leffler, Commented Dec 15, 2015 at 4:33

heemayl · Accepted Answer · 2015-12-15 04:32:07Z

1

You need to use command substitution $():

Also use echo to get the value of variable file:

fileName="$( echo "$file" | rev  | cut -d. -f2 | rev )"

Or use Here strings:

fileName="$( rev <<<"$file" | cut -d. -f2 | rev )"

answered Dec 15, 2015 at 4:32

heemayl

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2 Comments

sclee1 Over a year ago

Thanks for your answer.

sclee1 Over a year ago

Okay. I will do it. However, when I used my coded with awk, it didn't work.. I ran the code below in the for loop. awk '{print($2"\t"$3"\t"$4"\t""0""\t""0""\t"$5"\t"$6"\t"$7"\t"$8"\t"$fileName)}' $file

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