echo "-n $a : The string length is not 0" else echo "-n $a : The string length is 0" fi if [ $a ] then echo "$a : The string is not empty" else echo "$a : The string is empty" fi 结果 abc = efg: a != b -n abc : Th
-lt n1 小于 n2 (less than) -ge n1 大于等于 n2 (greater than or equal) -le n1 小于等于 n2 (less than or equal) 5. 判定字符串的数据 test -z string 判定字符串是否为 0 ?若 string 为空字符串,则为 true test -n string 判定字符串是否非为 0 ?若 string 为空字符串,则为 false。 注...
echo "-n $a : The string length is not 0" else echo "-n $a : The string length is 0" fi if 【 $a 】 then echo "$a : The string is not empty" else echo "$a : The string is empty" fi 结果 abc = efg: a != b -n abc : The string length is not 0 abc : The str...
Table 5-1. String comparison operators Operator True if... str1 = str2[4] str1 matches str2 str1 != str2 str1 does not match str2 str1 < str2 str1 is less than str2 str1 > str2 str1 is greater than str2 -n str1 str1 is not null (has length greater than 0)...
百度试题 结果1 题目bash脚本中测试一个值是否大于另一个值应该使用? A. > B. greater-than C. ge D. gt 相关知识点: 试题来源: 解析 D 反馈 收藏
${string:position:length} #在 $string 中从位置 $position 开始提取 $length 长度的子串. 1. 2. 3. 4. 5. 6. 示例: stringZ=abcABC123ABCabc # 0123456789... # 0-based indexing. echo ${stringZ:0} # abcABC123ABCabc echo ${stringZ:1} # bcABC123ABCabc echo...
if [ STRING1 < STRING2 ]; then The condition is true if the sorting of ‘STRING1’ is executed before ‘STRING2’, within the current locale. if [ -n NONEMPTYSTRING ]; then The condition is true if the string named ‘NONEMPTYSTRING’ has a length more than 0 (ZERO). if [ -...
-z string length is zero. 字符测试:字符串比较 双目: >: 大于则为真 <: 小于则为真 >=:大于等于则为真 <=:小于等于则为真 ==:等于则为真 !=:不等于则为真 单目: -n String: 是否不空,不空则为真,空则为假 -z String: 是否为空,空则为真,不空则假 ...
$string length >0 Why you should not use the || and && operators instead of a Bash If Statement? Trying to emulate a ternary operator with the || (or) and && (and) binary operators can be error-prone and lead to unexpected results. Prefer the a regular if statement constructs when...
${string:$pos:$len} 💡 Like arrays, positioning in strings also start at 0. Here's an example: Even if you specify the substring length greater than the string length, it will only go till the end of the string. Replace substring in bash ...