$ [ -f exists.txt && -d exists_folder ];echo$?bash: [: missing `]'2 结果提示漏了右括号,那是因为&&被 bash 预先解析了,而不是当成 test 的参数传递。 &&表示如果左边的命令正常执行了,那么继续执行右边的命令,相当于没有 else 部分的 if 语句简化版。 而||表示如果左边的命令不是
/bin/bashFILE=$1 if [ -f $FILE ]; then echo "File $FILE exists." else echo "File $FILE does not exist." fi我如何只检查文件是否不存在?解决方案1:一个优秀的自由职业者,应该有对需求敏感和精准需求捕获的能力,而huntsbot.com centos提示bash命令找不到...
/bin/bash if [ -d $HOME/Downloads ] then echo '~/Downloads folder exists' else echo "~/Downloads folder doesn't exist" exit fi for f in "$HOME/Downloads/*.jpg" do echo $f done 注意f in 后面 多了双引号。显示的结果就变了: ./test.sh ~/Downloads folder exists /home/chenshu/...
7. Bash 中的 if ## FORMAT if [ condition ]; then cmd elif [ condition ]; then cmd else cmd fi ## EXAMPLE if [ -e file1 ] # file1 exists if [ -f file1 ] # file1 exists and is a regular file if [ -s file1 ] # file1 exists and size > 0 if [ -L file1 ] # fil...
if [ -f "$file" ] ; then newfile=`echo "$file" | sed "s/${OLD}/${NEW}/g"` if [ -f "$newfile" ]; then echo "ERROR: $newfile exists already" else echo "renaming $file to $newfile ..." mv "$file" "$newfile" ...
bash 中的条件语句，基础就是 Test 。 if 先来个实例： x=5; if [ $x = 5 ]; then e...
echo -n "Checking if application exists... "$ if [ -d "/Applications/Install OS X Yosemite.app" ] $ then$ echo "Application is already downloaded and ready to continue."$ sleep 4$ break$ elif [ -f "$script_dir\Yosemite.tar.gz" ]$ ...
if [ -f "$MyFile" ]; then echo "$MyFile exists." else echo "$MyFile does not exist." fi Running the script results in the following output: 22. Check Inodes and Disk Usage Inodes represent data units on a physical or virtual server. Each text file, video, folder, HTML file, or...
-# shellcheck disable=SC2068 +# Verify required configurations +if ! bashio::config.exists 'voice'; then + bashio::exit.nok "Voice configuration is required" +fi + exec python3 -m wyoming_piper \ --piper '/usr/share/piper/piper' \ --uri 'tcp://0.0.0.0:10200' \ --length-scale ...
For example, if we need to move all .bash files into the script folder and then give them execute permissions, our script would look like this:#!/bin/bash for FILE in $HOME/*.bash; do mv "$FILE" "${HOME}/scripts" chmod +x "${HOME}/scripts/${FILE}" done...