if [ -e $file ]; then echo "File exists" else echo "File does not exists" fi 1. 2. 3. 4. 5. 6. 7. Similarly for example we can use while loop to check if file does not exists. This script will sleep until file does exists. Note bash negator "!" which negates the -e o...
、 mysql -u root -p"$MYSQL_ROOT_PASS" -e "CREATE DATABASE IF NOT EXISTS $MYSQL_DB; GRANT ALL PRIVILEGES ON $MYSQL_DB.* TO $MYSQL_DB@localhost;"ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version ...
test -f /etc/fstab ## true if a regular file test -h /etc/rc.local ## true if a symbolic link [ -x "$HOME/bin/hw" ] ## true if you can execute the file [[ -s $HOME/bin/hw ]] ## true if the file exists and is not empty 整数测试 整数之间的比较使用-eq、-ne、-gt...
Catkin tools installed successfully."fi}create_catkin_ws(){# Checkifworkspace existsif[ -e"$CATKIN_DIR/.catkin_workspace"] || [ -d"$CATKIN_DIR/.catkin_tools"]; thenecho"Catkin workspace detected at ~/catkin_ws"elseecho"Creating catkin workspace ...
博主使用 ubuntu 系统, shell 为 bash. 这个脚本也可以用在 mac 系统上.听说 windows 系统出了 ubuntu on windows, 不知道能不能使用这个脚本.
linux 输出文件名未正确命名为Bash所以我得到了（正确的）警告，因为我提供了一个可以完成工作的答案，但...
问在bash脚本中运行R脚本时出错ENE创建了一个bash脚本，如下所示：编程语言： 编译器，解释器 编程...
if it exists. When an interactive shell that is not a login shell is started, bash reads and executes commands from /etc/bash.bashrc and ~/.bashrc, if these files exist. This may be inhibited by using the --norc option. The --rcfile file option will force bash to read and execute...
linux 输出文件名未正确命名为Bash所以我得到了（正确的）警告，因为我提供了一个可以完成工作的答案，但...
This script uses the "mkdir" command to create the directories "dir_1", "dir_2", and "dir_3" in the current directory. It then checks the exit status of the "mkdir" command to determine if the directories were created successfully or not and prints an appropriate message accordingly. ...