break 命令允许跳出所有循环(终止执行后面的所有循环)。 下面的例子中,脚本进入死循环直至用户输入数字大于 5。要跳出这个循环,返回到 shell 提示符下,需要使用 break 命令。 #!/bin/bash while : do echo -n "Enter a number between 1 and 5:" read aNum case $aNum in 1|2|3|4|5) echo "The nu...
从这个 Bash 基础训练课程,我们将学习 Bash 的基础知识,并能开始些我们自己的 Bash 脚本和自动化日常任务。 Bash 是一种Unixshell和命令语言。它可以在各种操作系统上广泛使用,而且它也是大多数Linux系统上的默认命令解释器。 Bash 是 Bourne-Again SHell 的简称。 与其他shell一样,我们可以在终端中交互式地直接使...
echo "The string is not empty." fi 这是我们执行脚本时的结果: 代码语言:txt AI代码解释 $ ./test.sh Strings are different. 例4 -n运算符还可用于测试字符串长度是否不为零。 代码语言:txt AI代码解释 #!/bin/bash string="hello" if [[ -n $string ]]; then echo "The string is not empty...
' or a newline delimit a substring search string. */for(local_index = i; c =string[i]; i++) {#ifdefined (HANDLE_MULTIBYTE)if(MB_CUR_MAX >1&& rl_byte_oriented ==0) {intv;mbstate_tps;memset(&ps,0,sizeof(mbstate_t));/* These produce warnings because we're passing a const s...
for variable in list do commands done for (( expression1; expression2; expression3 )); do commands done break命令立即终止循环 continue命令立即终止本轮循环,开始执行下一轮循环。 条件判断 if结构的判断条件,一般使用test命令,有三种形式。 # 写法一 test expression # 写法二 [ expression ] # 写法三...
Let’s break down the code to understand how it works. As you can see, we start by defining a variablestring_with_newlinesthat holds the input string containing newline characters. Then, thesedcommand is used to perform text transformations. In this case, we are using the following expressio...
"which is not read as a comment. First line is also a place where you put your interpreter which is in this case: /bin/bash. Here is our first bash shell script example: #!/bin/bash # declare STRING variable STRING="Hello World" #print variable on a screen echo $STRING...
break fi done } _DEPENDTM_() { # checks and sets tar manager: depreciated for PKG in "${!ATM[@]}" do if [[ -x $(command -v "${ATM[$PKG]}") ]] then tm="$PKG" printf "\\nFound tar tool \`%s\`: Continuing…\\n" "$PKG" break ...
‘break’statement is used to terminate the loop based on any condition. The following example shows the uses of these statements in a for loop. Here, the loop is used to read a list of string data and each value in the list is stored in the variable,$food. When the value of $food...
# 每一句指令以換行或分號隔開:echo'This is the first line';echo'This is the second line'# 宣告一個變數:Variable="Some string"# 下面是錯誤的做法:Variable="Some string"# Bash 會把 Variable 當做一個指令,由於找不到該指令,因此這裡會報錯。# 也不可以這樣:Variable='Some string'# Bash 會認爲 ...