`whoami`command shows the username of the currently logged in user. By default, this command is stored in/usr/bin/folder. Run the following script to run `whoami`command using path and store in the variable,$output,and print the value of$output. $output=$(/usr/bin/whoami) $echo$output...
5. Run the script to see the function's output and exit status: ./test.sh An alternative method is to echo the function's result and assign the output to a variable. Edit thetest.shscript with the following code: test_function() {echoTest } result=$(test_function)echo$resultis saved...
Write a Bash script that declares two variables, "firstName" and "lastName", and assign them your first name and last name, respectively. Print a message greeting yourself using variable interpolation. Code: #!/bin/bash # Shebang line: Indicates the path to the shell interpreter (in this ...
printf “$SCRIPT: %s\n”“Processing files for $COMPANY...” This script is shorterthan the positional 这个脚本比定位参数的脚本更短,如果getopts出错,switch语句会不运行。 作为一个特定的情况,如果提供getopts命令作为一个额外的参数,getopts能够处理这些变量而不是脚本参数,这样可以使用特定的参数来测试开关。
Paste a shell script onhttps://www.shellcheck.netfor instant feedback. ShellCheck.netis always synchronized to the latest git commit, and is the easiest way to give ShellCheck a go. Tell your friends! From your terminal Runshellcheck yourscriptin your terminal for instant output, as seen above...
You can also assign the whole value to the variable and then use it anywhere in the bash script itself: #!/bin/bash current_user=$(whoami) echo "The current user is: $current_user" If you're curious, here's the expected output after executing the above script: ...
## 请使用bash 运行本脚本(或者在其他shell中通过bash ./scriptName 来让bash 执行本文件) # test echo $0 echo $SHELL # pgrep bash # pgrep zsh # pgrep sh echo "current process id :$$" echo "grep the pid:" # ps ax|grep -E "^\s*$$";echo $?
[zexcon ~]$ ./learnToScript.sh 8 2 15 1 1. 2. 3. 4. 5. 管道符 | 我们将使用另一个名为 grep 的工具来介绍管道运算符。 grep 可以在输入文件中搜索可以匹配指定模式的行。默认情况下,grep 会输出相应的匹配行。
管道命令仅会处理standard output, 对于 standard error会予以忽略。 管道命令必须要能够接收来自前一个命令的数据成为standard input继续处理才行。 十、变量(variable):命名的内存空间 变量命名规则: 1、只能包含字母、数字、下划线,并且首字母不能是数字(同大多数语言一致)2、不应该和系统的环境变量重名,除非你知道...
Let's now get in to how you can actually work with and modify the output of those variables when we call them. Setting the value when a variable isn't set You can make a variable default back to a certain string when a variable isn't set like so: ...