although the end result is the same (see below).# ---# It is permissible to set multiple variables on the same line,#+ if separated by white space.# Caution, this may reduce legibility, and may not be portable.var1=21var2=22var3=$V3echoecho"var...
command set 1 elif command2 then command set 2 elif command3 then command set 3 elif command4 then command set 4 fi 记住,在elif语句中,紧跟其后的else语句属于elif代码块。它们并不属于之前的 if-then代码块。 bash shell提供了另一种条件测试方法,无需在if-then语句中声明test命令。 if [ condition ...
If we replace the hard-coded string with acommand substitution, we can set multiple variables using a command’s output. Let’s test with the seven variables and thedatecommand scenario: $ read -r WEEK YEAR MONTH DAY HOUR MINUTE SECOND <<< "$(date +'%W %Y %m %d %H %M %S')" $ e...
更糟糕的是,tput实际上并不便携。有许多tput变体,每个变体都有不同的命令和语法(尝试tput setaf 3使用FreeBSD系统)。原始序列很好。 文字颜色 注意:需要RGB值的序列仅适用于真彩色终端仿真器。 文字属性 光标移动 删除文本 参数扩展 间接 替换
# Using variables ((var=var2*arr[2])) 三元测试 # Set the value of var to var2 if var2 is greater than var. # var: variable to set. # var2>var: Condition to test. # ?var2: If the test succeeds. # :var: If the test fails. ...
Set a sticky bit. -O You are the owner of the file. f1 -nt f2 file f1 is newer than f2. f1 -ot f2 file f1 is older than f2 Comparison Operators Comparison operators are used in bash to compare two strings to check if they are equal or not. Here, we will list some comparison...
与流行的看法相反,使用原始逃逸序列没有问题。使用tput与手动打印相同的ANSI序列的摘要。更糟糕的是,tput实际上并不便携。有许多tput变体,每个变体都有不同的命令和语法(尝试tput setaf 3使用FreeBSD系统)。原始序列很好。 文字颜色 注意:需要RGB值的序列仅适用于真彩色终端仿真器。
nvm will encounter some issues if you have some non-default settings set. (see #606) The following are known to cause issues: Inside ~/.npmrc: prefix='some/path' Environment Variables: $NPM_CONFIG_PREFIX $PREFIX Shell settings: set -e Installing nvm on Alpine Linux In order to provi...
Environment Variables:$NPM_CONFIG_PREFIX $PREFIXShell settings:set -eInstalling nvm on Alpine LinuxIn order to provide the best performance (and other optimizations), nvm will download and install pre-compiled binaries for Node (and npm) when you run nvm install X. The Node project compiles, ...
change_boot_menu - to set to "true" to edit boot menu (which adds options e.g. boot to ram, change id of live user, add rights for virt manager usage, replace splash/menu background image) Note: above are variables to set to run example 1 of script usage (to only add some s...