$ declare -A array $ for subscript in a b c d e > do > array[$subscript]="$subscript $RANDOM" > done $ printf ":%s:\n" "${array["c"]}" ## print one element :c 1574: $ printf ":%s:\n" "${array[@]}" ## print the entire array :a 13856: :b 6235: :c 1574: :d...
/bin/bash file="data.txt" array=() while IFS= read -r line; do array+=("$line") done < "$file" echo "All the elements of an array are: ${array[@]}" I know it looks complex. Let me break it down for you. array()created an empty array calledarray....
/bin/bash ${!string*}或${!string@}返回所有匹配给定字符串string的变量名。 $ echo ${!S*} SECONDS SHELL SHELLOPTS SHLVL SSH_AGENT_PID SSH_AUTH_SOCK 上面例子中,${!S*}扩展成所有以S开头的变量名。 子命令扩展 $(...)可以扩展成另一个命令的运行结果,该命令的所有输出都会作为返回值。 $ echo...
# get number of elements in the array ELEMENTS=${#ARRAY[@]} # echo each element in array # for loop for (( i=0;i<$ELEMENTS;i++)); do echo ${ARRAY[${i}]} done 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 8.2. Read file into bash array #!/bin/bash # Declare array d...
break else echo "Unknown input: $input" fi done 该脚本在while循环中不断调用read命令,使用-p选项设置提示字符串为 “tinyshell> ”,DOS 命令行的提示字符就是>。 具体执行结果如下: $ ./tinyshell.sh tinyshell> l tinyshell.sh tinyshell> d ...
Let’s break down what’s going on in the Bash script you just created. Bash executes programs in order from the first line in your file to the last line. Theexprcommand can be used toevaluateBashexpressions. An expression is just a valid string of Bash code that, when run, produces ...
‘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 $food...
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break [n] 從一個 for, while, until, 或者 select 循環退出。 如果指定了 n ,就跳出 n 層循環。 n 必須≥ 1。如果 n 比當前循環層數還要大,將跳出所有循環。 返回值是0,除非執行 break 的時候 shell 不是在執行一個循 環。 builtin shell-builtin [arguments] 執行指定的 shell 內建命令,傳遞 ...
if[$status-ne0];thensleep_time=$(((RANDOM%60)+1))echo"WARNING: Copy failed for$server:$REMOTE_FILE. Waiting '${sleep_time}seconds' before re-trying..."/usr/bin/sleep${sleep_time}selsebreak# All good, no point on waiting...fi((now=now+1))donereturn$status}DATADIR="$HOME/...