[ ARG1 OP ARG2 ] “OP” is one of -eq, -ne, -lt, -le, -gt or -ge. These arithmetic binary operators return true if “ARG1” is equal to, not equal to, less than, less than or equal to, greater than, or greater than or equal to “ARG2”, respectively. “ARG1” and “AR...
To check if two strings are equal in a Bash script, there are two comparison operators used. First, we’ll discuss the “==” operator. The “==” operator is used to check the equality of two bash strings. In the example below, two strings are defined: strng1 and strng2. Also, ...
else echo "Strings are not equal." fi 2. 使用 tr 命令去除所有空白字符 代码语言:txt 复制 string1=$(echo "your_string" | tr -d '[:space:]') string2=$(echo "your_string" | tr -d '[:space:]') if [ "$string1" == "$string2" ]; then echo "Strings are equal." else echo...
if/then/elif/else结构 使用和测试位置参数 嵌套if语句 布尔表达式 使用case语句 7.1. 介绍if 7.1.1. 概要 有时候你需要指定shell脚本中的依靠命令的成功与否来实施不同过程的行为。if结构允许你来指定这样的条件。 最精简的if命令的语法是: if TEST-COMMANDS; then CONSEQUENT-COMMANDS; fi TEST-COMMAND执行后且...
[ ARG1 OP ARG2 ] “OP” is one of -eq, -ne, -lt, -le, -gt or -ge. These arithmetic binary operators return true if “ARG1” is equal to, not equal to, less than, less than or equal to, greater than, or greater than or equal to “ARG2”, respectively. “ARG1” and “AR...
在Bash循环中,可以使用条件判断(如if语句)来控制循环的行为。此外,还可以使用break和continue语句来跳出或跳过循环的某次迭代。 4.1 使用if语句进行条件判断 bash for i in {1..10} do if [ $i -gt 5 ]; then echo "number $i is greater than 5" else echo "number $i is less than or equal to...
bash shell 需知,shell技巧(一)等于:equalto不等于:unequalto大于:greater小于:lessthan1.test测试命令test命令用于检查某个条件是否成立,它可以进行数值、字符和文件三个方面的测试,其测试符和相应的功能分别如下:(1)数值测试:-eq:等于则为真-ne:不等于则为真
is readable-s FILE_NAM # TrueifFILE_NAM existsandisnotempty-w FILE_NAM # TrueifFILE_NAM has write permission-x FILE_NAM # TrueifFILE_NAM is executable#字符串测试操作-z STRING # TrueifSTRING is empty-n STRING # TrueifSTRING isnotemptySTRING1...
In this example, we have two variables, ‘a’ and ‘b’. The script checks if ‘a’ is equal to ‘b’. If it’s not, it moves on to the ‘elif’ statement to check if ‘a’ is greater than ‘b’. If neither condition is met, it executes the ‘else’ statement, which in ...
问查找下一个最接近的值(bash)EN假设我在列中有一些假日数据(holiday_master.csv)，如下所示01:查找...