The $? is a special variable in bash. It holds the exit status code of the last executed command. In this case, it will capture the exit code of the ping command if it is equal to 0 it will display the message "
# 检查退出状态 if [ $exit_status -ne 0 ]; then echo "Error: Command '$command' returned non-zero exit status $exit_status." echo "Standard output:" echo "$output" else echo "Command '$command' executed successfully." fi 在这个示例中,ls /nonexistent_directory 命令会失败,因为/non...
echo "Symbolic link 'file_link' exists in the current directory.": If the symbolic link exists, this line is executed, indicating that the symbolic link exists. echo "Symbolic link 'file_link' does not exist in the current directory.": If the symbolic link does not exist, this line is ...
and you can derive that information by looking at the output of the "lsmap -all" command. If you've done your work correctly in the past, the naming of the vadapter and the virtual target devices will probably be the same on viosB...
Checking the exit status using an ‘if’ statement in Bash Using a “if” statement and the “$?” variable, we can determine whether a command or script has executed successfully. Which holds the exit status of the most recent command executed, the syntax of the “if” statement for dete...
If you want to automatically fix files when you save them, you need to turn a setting on in vimrc. "Set this variable to 1 to fix files when you save them.letg:ale_fix_on_save=1 The:ALEFixSuggestcommand will suggest some supported tools for fixing code. Bothg:ale_fixersandb:ale_...
● WINDOWS: Tasks are executed on a Windows VM. ● MAC: The agent registration command is run on a MAC host. Descriptio No Enter a maximum of 1,024 characters. n This pool No If this parameter is selected, all users of the current can be account can use the pool. ...
A total of seven files are created in the Outputs directory when these commands are executed, where: Command Description C:\Web_Visualisation_Tool The root directory for the WVT tool. 172.16.0.1 The IP Add...
For the operator machine (from where the tool will be executed), the following OS are supported: Linux (modern RHEL/CentOS or Debian/Ubuntu; others should work as well, but are not yet tested); MacOS. There are known cases when postgres-checkup was successfully used on Windows, although ...
We read every piece of feedback, and take your input very seriously. Include my email address so I can be contacted Cancel Submit feedback Saved searches Use saved searches to filter your results more quickly Cancel Create saved search Sign in Sign up Reseting focus {...