1、单分支的if语句 if 条件测试命令 then 命令序列 fi 2、双分支的if语句 if 条件测试命令 then 命令序列1 else 命令序列2 fi 3、多分支的if语句(elif 可以嵌套多个,一般多了用case表达) if 条件测试命令1 then 命令序列1 elif 条件测试命令2 then 命令序列2 ... else 命令序列n fi 案例1、 #!/bin/...
1.if-else-fi语句 if-else-fi语句的语法是: if [ condition ] then statements else statements fi 每个语句必须在单独的一行上。但是,如果多个语句之间用分号分开,则sh允许多个语句在同一行。 实例:使用read与if-else-fi语句判断输入字符串(该语句对于空格要求较为严苛) 实例:使用使用if-elif-else-fi复合语句,...
12.Shell if else语句: Shell 有三种 if ... else 语句: if ... fi 语句; if ... else ... fi 语句; if ... elif ... else ... fi 语句。 if ... else ... fi语句 if[ $a == $b ] then echo "a is equal to b" else echo "a is not equal to b" fi if ... elif .....
可以通过以下步骤完成: 1. 首先,需要编写一个Unix shell脚本,可以使用任何文本编辑器创建一个以.sh为扩展名的文件,比如replace_text.sh。 2. 在脚本中,使用sed命令...
if $startscript ; then log_end_msg 0 else log_end_msg 1 fi ;; stop) log_daemon_msg "Stopping application server" "IBM WAS" if $stopscript -user was-admin -password PASSWORD; then log_end_msg 0 else log_end_msg 1 fi restart) ...
$script = 'if [ `ps -ef | grep sleep | grep -v grep | wc -l` -eq "1" ]; then echo false; else echo true; fi'# Verify script variable $script# Get $script bytes $s = [System.Text.Encoding]::UTF8.GetBytes($script)
问UNIX :如何在不使用二进制运算符的情况下移动文件夹内的所有文件EN我有bash unix脚本将所有文件从文件...
Administração / Desempenho A maioria dos sistemas operacionais do tipo UNIX, incluindo Linux e macOS, fornece maneiras de limitar e controlar o uso de recursos do sistema, como threads, arquivos e conexões de rede por processo e por usuário. Esses "limites" impedem que usuários indiv...
What else can be said about the good old pwd who has been printing the current directory name for ages. 14. cd command examples Use “cd -” to toggle between the last two directories Use “shopt -s cdspell” to automatically correct mistyped directory names on cd More cd examples: 6 ...
tinted-shell - Adds a script to allow you to change your shell's default ANSI colors but most importantly, colors 17 to 21 of your shell's 256 colorspace (if supported by your terminal). This script makes it possible to honor the original bright colors of your shell (e.g. bright gree...