How to get the variable value from variable list in unix? [duplicate]

Question

I have severial variables with prefix INPUT:

${INPUT_1:="sample.txt"}
${INPUT_2:="sample_2.txt"}
${INPUT_3:="sample_3.txt"}

And then I get a list of variable value with prefix INPUT by :

env | awk -F= '/^INPUT/ {print $2}'

the result:

sample.txt sample_2.txt sample_3.txt

And then I want to count the lines of each these three file, I tried

 var = env | awk -F= '/^INPUT/ {print $2}'
 wc -l $var

But it didn' work. Does someone could help me with applying wc -l on the variables selected?

shellcheck.net . but also research xargs, many, many Q/A here for that topic. Good luck. — shellter
– shellter, Commented Oct 2, 2020 at 13:49

YLR · Accepted Answer · 2020-10-02 11:57:04Z

0

The easiest way looks like this I guess :

for input in $var
do 
  wc -l $input
done

answered Oct 2, 2020 at 11:57

YLR

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4 Comments

Jinn Over a year ago

Thanks .I tried it, while it didn't work, and no error message is shown, I wonder if it is because that it concerns file not normal variables of strings

YLR Over a year ago

the script must be run in the same directory of files that will "counted".

Jinn Over a year ago

All the code is in a shell script, and I put the for loop at the end of the script.

Jinn Over a year ago

Thanks YLR, it works, I had some syntax errors, thanks a lot!

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