bash script to handle multiple files at once

Question

I have files with multiple extension in a folder like .txt, .update, .text. The file names are like

out1.txt, out1.text, out1.update,

out2.txt, out2.text, out2.update

and so on....My command looks like this:

./script.pl out1.txt out1.text out1.update

I would like to put this command in the loop for every file. I have tried to use a loop like:

for i in *.{txt,text,update}

But it takes the full name including the extension so I couldn't figure out how to deduce the specific extension files in the command.

Thanks!

Possible duplicate of Extract filename and extension in Bash — Joe
– Joe, Commented Jul 7, 2017 at 13:32

Setop · Accepted Answer · 2017-07-07 14:43:22Z

2

you can use :

for f in *.txt;
do
    b=${f%.txt} # the trick is there
    ./script.pl $b.txt $b.text $b.update
done

edited Jul 7, 2017 at 14:43

answered Jul 7, 2017 at 13:38

Setop

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4 Comments

soosa Over a year ago

It gives an error that "b" command is not found. I have through multiple testings but it is giving an error.

soosa Over a year ago

It worked. I had the space in between variable "b" and equal sign "=". I remove it and then it worked perfectly. Thanks!

Setop Over a year ago

@AsmaTahir, indeed, bash is sensitive to the space before and after "="; I fixed my answer.

soosa Over a year ago

Yeah, I noticed the space later that's why I removed it. Thanks once again!

Raman Sailopal · Accepted Answer · 2017-07-07 13:32:49Z

1

ext=$(awk -F\. '{ print "."$NF }' <<< $i)
fil=$(basename -s $ext $i)

use awk to extract the extension (second delimited piece of data using ".") Use basename -s with the extension to the get the filename without the extension

answered Jul 7, 2017 at 13:32

Raman Sailopal

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