if [ -e "/path/to/file" ]; then echo "File exists." else echo "File does not exis...
复制代码 if [ -f /path/to/file ]; then echo "File exists." fi if-else语句 如果需要在满足条件时执行一组命令,在不满足条件时执行另一组命令,可以使用if-else结构: bash 复制代码 if [ 条件 ]; then # 如果条件为真,执行这里的命令 else # 如果条件为假,执行这里的命令 fi if-elif-else语句 当...
if[ ! -f /tmp/foo.txt ];thenecho"File not found!"fi
file="/home/shiyanlou/test.sh" if [ -r $file ] then echo "The file is readable" else echo "The file is not readable" fi if [ -e $file ] then echo "File exists" else echo "File not exists" fi 结果 The file is readable File exists 思考 浮点运算,比如实现求圆的面积和周长。 exp...
if [ - f "$file" ] then echo "$file found." else echo "$file not found." fi 1. 2. 3. 4. 5. 6. 7. 8. 检测文件属性的相关操作符 如果文件存在,并且具有相应的属性,如下的操作符都会返回true: Shell - b FILE FILE exists and is block special ...
/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...
-g file: True if file exists and is set-group-id.(SGID特殊权限位) -u file: True if file exists and is set-user-id.(SUID特殊权限位) -k file: True if file exists and its ``sticky'' bit is set. 文件大小测试 -s: True if file exists and its ``sticky'' bit is set. 文件是否...
anny ~> ./msgcheck.sh This scripts checks the existence of the messages file. Checking... /var/log/messages exists. ...done. 7.1.1.4. 检查shell选项 加入到你的Bash配置文件中去: # These lines will print a message if the noclobber option is set: ...
-e file True if file exists. -f file True if file exists and is a regular file. -g file True if file exists and its set-group-id bit is set. -h file True if file exists and is a symbolic link. -k file True if file exists and its “sticky” bit is set. ...
When bash is invoked as an interactive login shell, or as a non-interactive shell with the –login option, it first reads and executes commands from the file /etc/profile, if that file exists. After reading that file, it looks for ~/.bash_profile, ~/.bash_login, and ~/.profile, in...