echo "File exists" else echo "File does not exists" fi 1. 2. 3. 4. 5. 6. 7. Similarly for example we can use while loop to check if file does not exists. This script will sleep until file does exists. Note bash negator "!" which negates the -e option. #!/bin/bash while ...
How can I read user input in a bash script? Use the read command to read user input, e.g. read -p "Enter a value: " value. How can I check if a directory exists in a bash script? Use the if [ -d "dir" ]; then command to check if a directory named "dir" exists. How ...
printf “$SCRIPT:$LINENO: the temp file $TMP exists and cannot”\ be overwritten — aborting” >&2 exit 192 fi 下面的写法也可以但是不完全相同: if test -f “$TMP” && test ! -w “$TMP” ; then printf “$SCRIPT:$LINENO: the temp file $TMP exists and cannot”\ “ be overwritten ...
read-p"Please input only a absolute file path:"fileif[ -z $file];thenecho"You must input something."exit2fiif[ ! -e $file];thenecho"No such file $file"elif[ -d $file];thenecho"File $file is a directory."elif[ -L $file];thenecho"File $file is a symbolic."elif[ -b $file]...
执行命令区域，否则 不进入循环，介绍while 命令 行3，执行命令区域，这些命令中，Bash，Unix shell的...
printf "unable to create directory %s\n" "$dir" >&2 exit 1 } ls *.pc 2>/dev/null || exit 1 ## check .pc file exists or exit file7="${1##*/}" ## trim path from file.7 name pc_script -f "$file7" -flags1 -other_flags ## first run ...
/usr/bin/env bash if [ -d work ] then # remove old work directory if it exists rm -rf work fi mkdir work cd work tar xzf /usr/src/distfiles/sed-3.02.tar.gz cd sed-3.02 ./configure --prefix=/usr make 1. 回页首...
问在if语句中运行bash脚本EN我刚刚开始使用AppleScript，正在测试一个现有的脚本，看看是否可以在我的...
cp: cannot stat ‘01’: No such file or directory .. 如果带上引号,就不会有上面的问题,除非文件名以 '-' 开头,在这种情况下,cp 会认为你提供的是一个命令行选项,这个错误下面会介绍。 3. 文件名中包含短横 '-' 文件名以 '-' 开头会导致许多问题,*.mp3 这种通配符会根据当前的locale[8]展开成一...
Create one with touch ~/.zshrc and run the install script again. If you use bash, the previous default shell, your system may not have .bash_profile or .bashrc files where the command is set up. Create one of them with touch ~/.bash_profile or touch ~/.bashrc and run the install ...