字符串可以是任何字符序列。...要测试两个字符串是否相同,两个字符串必须包含完全相同的字符且顺序相同,它可以是一个词或整个句子,例如,string one等于string one但不等于string two。...在本教程中,我们将向您展示如何在Linux 系统上比较Bash 脚本中的字符串,我们将在一个简单的 if/else Bash 脚本的上下文中...
问在Bash中比较两个字符串时获得“未找到命令”错误EN今天学习了rsync的同步操作，本打算往服务器同步...
Bash string comparison It is advisable always to check and compare if two strings are equal in a Bash script; this is quite important for different reasons. If two strings are equal in a Bash script, it implies that both strings have the same length and character sequence. The “if” stat...
[[ string1 =~ regex ]] if [[ "$INT" =~ ^-?[0-9]+$ ]]; wangdoc.com/bash/condit • AND运算:符号&&,也可使用参数-a。 • OR运算:符号||,也可使用参数-o。 • NOT运算:符号!。 [[ $INT -ge $MIN_VAL && $INT -le $MAX_VAL ]] ((...))作为算术条件 if ((3 > 2))...
https://ryanstutorials.net/bash-scripting-tutorial/bash-if-statements.php https://stackoverflow.com/questions/4277665/how-do-i-compare-two-string-variables-in-an-if-statement-in-bash http://www.masteringunixshell.net/qa36/bash-how-to-add-to-array.html ...
五、if语句 if 中一定要用[]来描述里面的判断语句 注意这里的单个 号 -eq 数值上的比较(==),=类似于string中的compare 这里$?中,0表示TRUE,1表示FALSE if嵌套: if else: nl就是列出每行的行号,并输出每行内容 elseif and or df -h 返回文件的使用情况 ...
Write a Bash script that takes a string as an argument and prints “how proper” if the string starts with a capital letter. Write a Bash script that takes one argument and prints “even” if the first argument is an even number or “odd” if the first argument is an odd number. ...
Check file types and compare values. Returns 0 if the condition evaluates to true, 1 if it evaluates to false. More information: https://www.gnu.org/software/bash/manual/bash.html#index-_005b_005b. - Test if a given variable is equal/not equal to the specified string: ...
if [ -n "$BASH_SOURCE" -a "$BASH_SOURCE" != "$0" ] then echo "be sourced by other scripts" else echo "be run in shell" fi 1. 2. 3. 4. 5. 6. 16. ${}参数展开 我们知道${parameter}是展开变量parameter这个值,在上一篇简洁的bash编程技巧中也曾经介绍过${parameter:-word}这种用法...
if [ -z "$string1" ] then echo "Null Strings" fi if [ -z "$string2" ] then echo "Empty Strings" fi Bash 脚本中的单方括号和双方括号 我们还可以在if语句中使用双方括号: if [[ "$string1" == "My String" ]] 单个方括号是老版本的 POSIX 约定的写法,现在看起来它有一些毛病。如果我们...