# Check if a command is successful if ls then echo "Command succeeded" else echo "Command failed" fi ``` 通过使用if-else语句,用户可以根据不同的条件执行不同的操作。这使得Bash脚本更加灵活和强大,可以满足各种不同的需求。同时,if-else语句也可以嵌套在其他if-
command case $? in 0) echo "Command succeeded." ;; 1) echo "Command failed due to minor problem." ;; 2) echo "Command failed due to severe problem." ;; *) echo "An unknown error occurred." ;; esac 6. 注意事项 (1)$?只保存最后执行的命令的退出状态。如果在检查$?之前执行了其他命...
command case $? in 0) echo "Command succeeded." ;; 1) echo "Command failed due to minor problem." ;; 2) echo "Command failed due to severe problem." ;; *) echo "An unknown error occurred." ;; esac 6. 注意事项 (1)$?只保存最后执行的命令的退出状态。如果在检查$?之前执行了其他命...
参见ulm.de/~mascheck/variable/set-e,专门关注与可移植性相关的行为方面。 @Charlesduffy,in the case where trap calls EDOCX1 original 0 command.Do you consider using EDOCX1 original 1 to retrieve and report the problematic command?Additionally,EDOCX1 original 2 when retrieved first thing within EDO...
status has succeeded. An exit status of zero indicates success. A non-zero exit status indicates failure. When a command terminates on a fatal signal N, bash uses the value of 128+N as the exit status.As usual, you should always read the man page of the scripts you're calling, to se...
Every command in bash returns an exit status, which is an integer between 0 and 255 that represents whether the command succeeded or failed, and if it failed, what kind of error occurred. Functions also can return an exit status via thereturnkeyword. The exit status can be checked using ba...
: line 1: $'\r': command not found 1. 出现这样的错误,是因为Shell脚本在Windows系统编写时,每行结尾是\r\n,而在Linux系统中行每行结尾是\n,所以在Linux系统中运行脚本时,会认为\r是一个字符,导致运行错误。 解决方法 去除Shell脚本的\r字符: ...
bash's exit status is the exit status of the last command executed in the script. If no commands are executed, the exit status is 0. An attempt is first made to open the file in the current directory, and if no file is found, the shell searches the directories in PATH for the ...
Bash while Loop Until Command Succeeds Conclusion Bash while Loop Syntax The syntax of Bash while loop is as follows: while [condition] do commands_to_execute done The while loop is initiated with thewhile, succeeded by the condition enclosed withinthedoanddonekeywords. ...
问Bash - dirname:缺少操作数EN报错信息： [root@localhost bin]# bash startup.sh -m standalone ...