我在 bash 中運行它，即使有一個 .txt 檔案，它也會在終端中列印出“沒有要創建的新檔案夾”。我錯過了什么嗎？
FILES=cluster-02/*/*
for f in $FILES
do
if [[ $f == *."txt" ]]
then
cat $f | xargs mkdir -p
else
echo "No new folders to create"
fi
done;
uj5u.com熱心網友回復：
您正在回圈多個檔案，因此第一個結果可能會觸發 ，if而第二個結果可能會顯示else.
您可以將通配符結果保存在一個陣列中，檢查其中是否有內容，如果有則回圈：
shopt -s nullglob
FILES=( foo/* )
if (( ${#FILES[@]} )); then
for f in "${FILES[@]}"; do
if [[ $f == *."txt" ]]; then
echo $f
fi
done
else
echo "No new folders to create"
fi
uj5u.com熱心網友回復：
正如第一條評論中提到的，行為確實與您對腳本的期望一樣：您運行所有檔案、文本檔案和其他檔案。如果您的檔案是文本檔案，則執行if-case；如果您的檔案是另一種型別的檔案，則執行else-case。
為了解決這個問題，您可能決定不考慮其他檔案（僅處理文本檔案），我認為您可以這樣做：
FILES=cluster-02/*/*.txt
uj5u.com熱心網友回復：
#!/usr/bin/env bash
# Create an array containing a list of files
# This is safer to avoid issues with files having special characters such
# as spaces, glob-characters, or other characters that might be cumbersome
# Note: if no files are found, the array contains a single element with the
# string "cluster-02/*/*"
file_list=( cluster-02/*/* )
# loop over the content of the file list
# ensure to quote the list to avoid the same pitfalls as above
for _file in "${file_list[@]}"
do
[ "${_file%.txt}" == "${_file}" ] && continue # skip, not a txt
[ -f "${_file}" ] || continue # check if the file exists
[ -r "${_file}" ] || continue # check if the file is readable
[ -s "${_file}" ] || continue # check if the file is empty
< "${_file}" xargs mkdir -p -- # add -- to avoid issues with entries starting with -
_c=1
done;
[ "${_c}" ] || echo "No new folders to create"
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