In the script above, we check if the exit code is equal to 0, indicating the command executed successfully. If true, execute a command. In this case, echo “success.” Otherwise, echo “fail.” Conclusion In this quick tutorial, we used bash operators and exit codes to execute a command...
/bin/bash if [ x$1 != x ] then #...有参数 else then #...没有参数 fi 为什么要使用 x$1 != x 这种方式来比较呢?想像一下这种方式比较: if [ -n $1 ] #$1不为空 但如果用户不传参数的时候,$1为空,这时 就会变成 [ -n ] ,所以需要加一个辅助字符串来进行比较。 手工处理方式能满足...
execute~/.bash_profile3.10.0-514.el7.x86_64-bash-4.2$ # 此时非交互式shell已退出 6、“rc”系列的执行场景 根据bash 手册上的描述: When an interactive shell that is not a login shell is started, bash reads and executes commands from ~/.bashrc, if that file exists. This may be inhibited...
possible-hostname-completions ( C-x @ ) 把标志点前的文本当成主机名并列出可以补全的条目。 complete-command ( M-! ) 把标志点前的文本当成命令名并试图进行补全。进行命令名补全时会依次使用别名、保留字、shell 函数、shell 内部命令,最后是可执行文件名。 possible-command-completions ( C-x ! ) 把标...
and execute the resulting commands. Exit Status: Returns exit status of command or success if command is null. source --help source: source filename [arguments] Execute commands from a file in the current shell. Read and execute commands from FILENAME in the current shell. The ...
edit-and-execute-command (C-xC-e) 针对当前命令行调用编辑器,把编辑后的结果作为Shell命令予以执行。bash 将会依次尝试调用VISUAL和EDITOR变量定义的编辑器,以及emacs编 辑器。 文本修改命令delete-char(^D) 删除光标位置的字符。 backward-delete-char (Delete) 删除光标位置(左边)的字符。当给定一个数字参数时...
本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容...
STRING True if string is not empty. 即,test命令使用-z STRING操作符来判断STRING字符串的长度是否为 0。 如果为 0,就是空字符串,会返回 true。 具体写法是test -z STRING,使用[命令则写为[ -z STRING ]。 -n STRING操作符判断STRING字符串的长度是否为 0。
Add a html content to word document in C# (row.Cells[1].Range.Text) Add a trailing back slash if one doesn't exist. Add a user to local admin group from c# Add and listen to event from static class add characters to String add column value to specific row in datatable Add comments...
exit is a builtin command and cause the shell to exit with a given exit status. n is the exit status of n. If n is omitted,the exit status is that of the last command executed. A function can be called on a EXIT before the shell terminates.