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 六、循环(Loop) while until until 使用 For循环 依次读name...
Since the first argument to this script was4, and 4 is equal to 4, the code within the IF statement was executed. You can pair IF statements with ELSE statements. An ELSE statement only runs if the conditional expression being evaluated by the IF statement is false. Let’s create a simp...
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...
hostname 如何使用IF语句比较字符串的值? #!/bin/bash string1="Hello World!" string2="Hello Bash!" if [[ $string1 == "Hello World!" ]] then printf "Same! \n" else print "Different! \n" fi if [[ $string2 = *"Bash"* ]] then printf "Contains word 'Bash'. \n" else printf ...
Let’s create a Bash script to take the username as input from the user and compare the name string with the hardcoded name. #!/bin/bash echo "Enter Username" read name while [ "$name" = "sam" ] || [ "$name" = "Sam" ] ...
在面对一组服务器时，你还可能需要决定使用哪种负载平衡算法。在做这些决策时，对不同负载平衡器配置中...
There is no in array operator in bash to check if an array contains a value. Instead, to check if a bash array contains a value you will need to test the values in the array by using a bash conditional expression with the binary operator =~. The string to the right of the operator...
# Greater than or equal (( NUM < NUM )) # Numeric conditions # String if [[ -z "$string" ]]; then echo "String is empty" elif [[ -n "$string" ]]; then echo "String is not empty" else echo "This never happens" fi # Equal if [[ "$A" == "$B" ]] # Regex if [[...
docker_build_hashref.sh - runs docker build and auto-generates docker image name and tag from relative Git path and commit short SHA hashref and a dirty sha suffix if git contents are modified. Useful to compare docker image sizes between your clean and modified versions of Dockerfile or cont...
$ if [[ ${var} != ${var,,} ]]; then echo "The string contains uppercase letters." else echo "The string contains only lowercase letters." fi The string contains uppercase letters. Here, we compare${var}with${var,,}. The${var}variable holds the original string, while the${var,...