How do I compare two string variables in an 'if' statement in Bash? 本问题已经有最佳答案,请猛点这里访问。 我正在尝试在bash中使用if语句(使用ubuntu): 123456789 #!/bin/bash s1="hi" s2="hi" if ["$s1" =="$s2"] then echo match fi 我试过各种形式的if声明,使用[["$s1" =="$s2"]]...
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 https://www.cyberciti.biz/faq/linux-u...
Thesebinarylogical expressions compare two values, but there are alsounarylogical expressions that only look at one value. For example, you can test whether or not a file exists using the-elogical flag. Let’s take a look at this flag in action: cd~/Code[[-emath.sh]]&&echot||echof #...
bash_variables/array/编写shell过程,实现复制一个完整目录的功能 bash variables& expressions references 获取帮助 检查变量类型(属性) 条件判断 test/[ ]判断 test/[ ]基本情况 ...
str2=$str1 str1=$tmp fi echo the strings after compare,the results are below echo $str1 $str2 $str3 #!/bin/bash echo $# echo please input two variables ending with ENTERread iValue1 read iValue2 echo"the result of '*' is `expr $iValue1 \* $iValue2`"echo"the result of '/...
file f1 is newer than f2. f1 -ot f2 file f1 is older than f2 Comparison Operators Comparison operators are used in bash to compare two strings to check if they are equal or not. Here, we will list some comparison operators including, string, and integer operators. Integer Operators Operat...
You can compare 2 strings using the=or==operator, it’s the same: "$dogname"="$anotherdogname""$dogname"=="$anotherdogname" It’s not an assignment because of the spaces surrounding the=. You can also check for unequality:
输出变量(Exporting Variables) script1.sh: #!/bin/bash # demonstrate variable scope 1. var1=blah var2=foo # Let's verify theircurrent valueecho $0 :: var1 : $var1, var2 : $var2 export var1 ./script2.sh # Let's see what they are now ...
diff<(lsdir1)<(lsdir2)# Output:# Only in dir1: file1.txt# Only in dir2: file2.txt Bash Copy In this code block, we use process substitution to compare the contents of two directories using thediffcommand. The output lists the files that are unique to each directory. ...
在bash中，变量是一个用来存储数据的实体。每个变量都有一个名称和一个值，名称是变量的 ...