如何为文件的每一行创建文件夹？

Question

I want create per each line of text file create nested directory.

for (( i=0;i<=$(cat filename | wc -l);i++ ))
do
mkdir /PATH/$i
done

Answer 1

You are missing the third part of for (( init; condition; increment)) . The correct version should be

for (( i=0; i<=$(cat filename | wc -l); i++ )); do
    mkdir /PATH/$i
done

However, this is a very crude way to tackle the problem. A better approach would be the following (courtesy of tripleee)

seq 0 $(wc -l <filename) | xargs -I mkdir /PATH/{}

Note that both commands will create one directory more than the file has lines. For a file with two lines the directories 0 , 1 , and 2 will be created. If this was an bug in your original script, change the 0 in the scripts to 1 .