Use the if-else statement with the -v option to check if an environment variable is set in bash. The echo command in the if block will be executed if the will
/bin/bash## Name: test-bucket-1## Purpose:# Performs the test-bucket number 1 for Product X.# (Actually, this is a sample shell script,# which invokes some system commands# to illustrate how to construct a Bash script)## Notes:# 1) The environment variable TEST_VAR must be set# (...
docker run --rm -v"$PWD:/mnt"koalaman/shellcheck:stable myscript# Or :v0.4.7 for that version, or :latest for daily builds or usekoalaman/shellcheck-alpineif you want a larger Alpine Linux based image to extend. It works exactly like a regular Alpine image, but has shellcheck preinstal...
其次,Shell 是一个命令解释器,解释用户输入的命令。它支持变量、条件判断、循环操作等语法,所以用户可以用 Shell 命令写出各种小程序,又称为脚本(script)。这些脚本都通过 Shell 的解释执行,而不通过编译。 最后,Shell 是一个工具箱,提供了各种小工具,供用户方便地使用操作系统的功能。 Shell 的种类 Shell 有很多种...
If the environment variable $XDG_CONFIG_HOME is present, it will place the nvm files there. You can add --no-use to the end of the above script to postpone using nvm until you manually use it: export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" |...
println(ANSI_BOLD + ANSI_GREEN + "Found environment variable named hub_org with value as: " + hub_org + ANSI_NORMAL) } } // cleanWs() checkout scm commit_hash = sh(script: 'git rev-parse --short HEAD', returnStdout: true).trim() ...
If the environment variable $XDG_CONFIG_HOME is present, it will place the nvm files there. You can add --no-use to the end of the above script to postpone using nvm until you manually use it:export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" ||...
To set environment variables in bash, you can use the export command. For example, to set an environment variable named MY_VAR with the value "value", you can use the following command: "export MY_VAR=value". The environment variable will be set for the current shell and for any child...
git_repos_update.sh - same as above but also runs the make update build to install the latest dependencies, leverages the above script git_grep_env_vars.sh - find environment variables in the current git repo's code base in the format SOME_VAR (useful to find undocumented environment variab...
如果執行失敗,因為檔案不是可執行格式,並且此檔案不是目錄,就假定它是 一個 shell script (指令碼),一個包含 shell 命令的檔案。此時將孵化 (spawn) 出一個子 shell 來執行它。子 shell 重新初始化自身,效果就好像是 執行 了一個新的 shell 來處理指令碼一樣,但是父 shell 儲存的命令位置仍然被 保留 (...