if [ -e $file ]; then echo "File exists" else echo "File does not exists" fi 1. 2. 3. 4. 5. 6. 7. Similarly for example we can use while loop to check if file does not exists. This script will sleep until file
test -f /etc/fstab ## true if a regular file test -h /etc/rc.local ## true if a symbolic link [ -x "$HOME/bin/hw" ] ## true if you can execute the file [[ -s $HOME/bin/hw ]] ## true if the file exists and is not empty 整数测试 整数之间的比较使用-eq、-ne、-gt...
、 mysql -u root -p"$MYSQL_ROOT_PASS" -e "CREATE DATABASE IF NOT EXISTS $MYSQL_DB; GRANT ALL PRIVILEGES ON $MYSQL_DB.* TO $MYSQL_DB@localhost;"ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version ...
Catkin tools installed successfully."fi}create_catkin_ws(){# Checkifworkspace existsif[ -e"$CATKIN_DIR/.catkin_workspace"] || [ -d"$CATKIN_DIR/.catkin_tools"]; thenecho"Catkin workspace detected at ~/catkin_ws"elseecho"Creating catkin workspace ...
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...
问使用/bin/bash -c安装pod崩溃EN曾几何时，我们将自己的应用运行在Kubernetes上，每当出现容器异常崩溃时，我们往往都是一边重启容器，一边面对崩溃的容器无从下手。通常在业务研发自己build的镜像内包含了shell，我们还能通过在command中嵌入一个["sleep", "3600"]命令来阻塞容器内服务启动，不过也有时候会出现不...
fi ((now=now+1)) done return $status } DATADIR="$HOME/Documents/lshw-dump" if [ ! -d "$DATADIR" ]; then /usr/bin/mkdir -p -v "$DATADIR"|| "FATAL: Failed to create $DATADIR" && exit 100 fi declare -A server_pid for server in ${servers[*]}; do remote_copy $server ...
but filename does not need to be executable. ThefilesearchedforinPATH need not be executable. When bash is not24inposix mode, it searches the current directoryifnofileis foundinPATH. If the sourcepath option to the shopt builtin25command is turned off, the PATH is not searched. If any ar...
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. ...