shell script if -z option
3 Answers. From "help test": -z STRING True if string is empty. suggests that zero length returns true as well, I'd suggest doing "man test" on your machine to check the exact wording on your system.,UNIX Shell Script 的內容為UNIX指令與一些控制及迴圈指令的組合。 ... 常用option與其所代表的意義如下： -z. True if string length is zero -n. True if string length is ... ,You can find a very nice reference for bash's operators here. If you are using a different shell, just search for <my shell> operators and you will find everything ... , 我們經常談到的Linux﹐其實是指kernel 這部份﹐而在kernel 之外﹐則是各種各樣的程式和工具﹐ ... if [ -z $1 ] then echo "Syntax Erro! ... are following users on the machine:" 21 who ;; 22 *) echo "Your choice is an invalid option., if 条件 then. Command else. Command fi 别忘了这个结尾. If语句忘了结尾fi test.sh: line 14: syntax error: unexpected end of fi ..., shell脚本if判断语句的条件参数_shell 脚本-a. ... 管道是linux里面进程间通信的一种方式，其他的还有像信号（signal）、信号量、消息队列、共享内存、套接字（socket）等。 [-r file] 如果file存在且是可 ... [-z string] “string”的长度为零则为真, -z string True if the string is null (an empty string).
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 shell script if -z option 相關參考資料
-z option inside if condition in shell script - Stack Overflow
3 Answers. From "help test": -z STRING True if string is empty. suggests that zero length returns true as well, I'd suggest doing "man test" on your machine to check the exact... https://stackoverflow.com Shell Programming
UNIX Shell Script 的內容為UNIX指令與一些控制及迴圈指令的組合。 ... 常用option與其所代表的意義如下： -z. True if string length is zero -n. True if string length is ... http://nmc.nchu.edu.tw Shell scripting: -z and -n options with if - Unix & Linux Stack ...
You can find a very nice reference for bash's operators here. If you are using a different shell, just search for <my shell> operators and you will find everything ... https://unix.stackexchange.com Shell 和Shell Script - Learning Linux
我們經常談到的Linux﹐其實是指kernel 這部份﹐而在kernel 之外﹐則是各種各樣的程式和工具﹐ ... if [ -z $1 ] then echo "Syntax Erro! ... are following users on the machine:" 21 who ;; 22 *) echo "Your choice is an invalid ... http://www.study-area.org shell编程——if语句if -z -n -f - 博客园
if 条件 then. Command else. Command fi 别忘了这个结尾. If语句忘了结尾fi test.sh: line 14: syntax error: unexpected end of fi ... https://www.cnblogs.com shell脚本中的if 参数-a至-z_shenhuxi_yu的专栏-CSDN博客_ ...
shell脚本if判断语句的条件参数_shell 脚本-a. ... 管道是linux里面进程间通信的一种方式，其他的还有像信号（signal）、信号量、消息队列、共享内存、套接字（socket）等。 [-r file] 如果file存在且是可 ... [-z string] “string”的长度为零则为真 https://blog.csdn.net What does -z mean in Bash? - Stack Overflow
-z string True if the string is null (an empty string). https://stackoverflow.com |