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 ...
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...
if [ -e $file ]; then echo "File exists" else echo "File does not exists" fi 1. 2. 3. 4. 5. 6. 7. Similarly for example we can use while loop to check if file does not exists. This script will sleep until file does exists. Note bash negator "!" which negates the -e o...
linux 输出文件名未正确命名为Bash所以我得到了（正确的）警告，因为我提供了一个可以完成工作的答案，但...
mysql -u root -p"$MYSQL_ROOT_PASS" -e "CREATE DATABASE IF NOT EXISTS $MYSQL_DB; GRANT ALL PRIVILEGES ON $MYSQL_DB.* TO $MYSQL_DB@localhost;"ERROR 1064 (42000) at line 1: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version fo ...
inotifywait -mq --format %f -e create$MON_DIR|\whilereadfiles;doecho$files>> test.logdone ### 12.将位置参数拆分为到每个变量 positional_argument_split.sh #!/bin/bash#将位置参数192.168.108.1{1,2}拆分为到每个变量num=0foriin$(evalecho$*);doletnum+=1evalnode${num}="$i"doneecho$node...
#!/bin/bash DIR="/home/user/Documents" if [ -d "$DIR" ]; then echo "Exist" fiLet's run it in the shell and see,As you can see, the script output says the directory exists. Let's see how we can check if a directory does not exist....
1、备份系统。tar备份系统并对比备份出来的文件.tar.bz2和实际的系统文件数目是否对应，以判断备份是否...
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...
bash will use whatever regex engine is installed on the user's system. Stick to POSIX regex features if aiming for compatibility.CAVEAT: This example only prints the first matching group. When using multiple capture groups some modification is needed....