否则，退出false。这可能是为了便于编写：[ $variable_that_may_or_may_not_be_defined ]如果添加引号...
>>> core__bash_version_test=true >>> set -o nounset >>> core_is_defined undefined_variable; echo $? 1Function core_is_emptyTests if variable is empty (undefined variables are not empty)>>> local foo="bar" >>> core_is_empty foo; echo $? 1>>> local defined_and_empty="" >>...
/bin/bash## Name: test-bucket-1## Purpose:# Performs the test-bucket number 1 for Product X.# (Actually, this is a sample shell script,# which invokes some system commands# to illustrate how to construct a Bash script)## Notes:# 1) The environment variable TEST_VAR must be set# (...
并且你可以使用$VARIABLE(变量名)来引用变量。需要注意的是不要在=运算符的两边放置空格符,比如VARIABLE= 2、VARIABLE = 2、或者VARIABLE =2,这并不是语法错误,但是将会做完全不需要的事情(比如试图运行一个名字为2的程序,并将环境变量VARIABLE设置为空字符串)。 Bash变量并不要求全部大写,但是通常是大写的。 大...
When invoked as an interactive shell with the name sh, bash looks for the variable ENV, expands its value if it is defined, and uses the expanded value as the name of a file to read and execute. Since a shell invoked as sh does not attempt to read and execute commands from any ...
If your shell (your default interactive shell, as reflected in environment variable$SHELL) isbash,ksh,zsh,fish, orpwsh(PowerShell), the relevant shell initialization file is modified: Environment variableN_PREFIXis defined to point to the installation directory. ...
test Fix stacktest complaining about permissions on /mnt 2个月前 .dockerignore Revert "Allow running this repo as a pre-commit hook" 3年前 .ghci Make .ghci look in ./src 7年前 .github_deploy Remove trailing whitespace 3年前 .gitignore ...
commands from filename in the current shell environment and return the exit status of the last command executed from filename.The return status is the status of the last command exited within the script (0 if no commands are executed), and false if filename is not found or cannot be read...
# 1) The environment variable TEST_VAR must be set # (as an example). # 2) To invoke this shell script and redirect standard # output and standard error to a file (such as # test-bucket-1.out) do the following (the -s flag ...
译:在login shell中,会默认读取/etc/profile,~/.bash_profile, ~/.bash_login, or ~/.profile.的内容,首先读取/etc/profile,然后只读取后面三个中的其中一个,按顺序读取找到的第一个文件。如果有此--noprofile选项,则不会读取这些文件 --norc Do not read and execute the personal initialization file ~...