echo "The name of this script is \"$0\"." echo "The name of this script is \"`basename $0`\"." echo if [ -n "$1" ] # 测试变量被引用. then echo "Parameter #1 is $1" # 需要引用才能够转义"#" fi if [ -n "$2" ] then echo "Parameter #2 is $2" fi if [ -n "${...
Example of running bash script with logical operators in if statement ️ 练习时间 让我们做一些练习吧 练习1:编写一个 Bash Shell 脚本,检查作为参数提供给它的字符串的长度。如果未提供参数,它将打印 “empty string”。 练习2:编写一个 Shell 脚本来检查给定文件是否存在。你可以提供完整的文件路径作为参数...
Example of running bash script with logical operators in if statement 🏋️ 练习时间 让我们做一些练习吧 😃 练习1:编写一个 Bash Shell 脚本,检查作为参数提供给它的字符串的长度。如果未提供参数,它将打印 “empty string”。 练习2:编写一个 Shell 脚本来检查给定文件是否存在。你可以提供完整的文件路...
if[ expression1 ] &&[ expression2 ]; then ...if[[ expression1 && expression2 ]]; then... 案例分析 当执行以下代码时,无法准确得到期望的判断内容: functiontest_empty_string(){ test-n$1&& echo 'not null' ||echo 'null string' } test_empty_string""#return "not null" 总会得到 not nul...
The-zoperator on the other is used to test whether a string is empty. Now, let's combine both of these and write a simple bash script: #!/bin/bash array1=('1' '23' '4' '56' '78' '9' '0') array2=() if [[ -z "${array1[@]}" ]]; then ...
Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article...
A Shell script usually needs to test if a command succeeds or a condition is met. In Bash, this test can be done with a Bash if statement. As with any other programming language, Bash comes with conditional expressions that allow you to test for conditions and alter the control flow if ...
Run Bash Script MyScript.sh 1 2 3 ./MyScript.sh Output 1 2 3 No match found In this example, the substitution command is used with $() to capture the output of grep, and then the -z option of the test command is used to check if the resulting string is empty or not. He...
if [ -z "$b" -a "${bxxx}" = "xxx" ] # 这里的判断会有单独的文章介绍 then echo 'b is set but empty'; # 设置但为空 else echo 'b is not set'; # 没设置,如 c fi``` 变量中的空格 代码语言:javascript 代码运行次数:0
这个bashshell脚本需要多个脚本。pdf文件使用zenity输入,并存储在ghostscript的数组中。pdf至。jpeg转换。 Problem 需要存储在带有转义空格的数组中的文件路径才能进入gs命令$i 在for循环内部的gs命令中,需要输出文件名的basefile名称 gs命令需要带转义空格的文件名。