什么是" =〜"运营商在shell脚本呢? [英] What does the "=~" operator do in shell scripts?
问题描述
这似乎是那种比较运算,但正是它在如确实以下code(从<一所href=\"https://github.com/lvv/git-prompt/blob/master/git-prompt.sh#L154\">https://github.com/lvv/git-prompt/blob/master/git-prompt.sh#L154)?
It seems that it is sort of comparison operator, but what exactly it does in e.g. the following code (taken from https://github.com/lvv/git-prompt/blob/master/git-prompt.sh#L154)?
if [[ $LC_CTYPE =~ "UTF" && $TERM != "linux" ]]; then
elipses_marker="…"
else
elipses_marker="..."
fi
我目前正在试图使混帐提示
的MinGW下工作,并与MinGW的提供的外壳似乎并不支持这个操作:
I'm currently trying to make git-prompt
to work under MinGW, and the shell supplied with MinGW doesn't seem to support this operator:
conditional binary operator expected
syntax error near `=~'
` if [[ $LC_CTYPE =~ "UTF" && $TERM != "linux" ]]; then'
在这个特定的情况下,我可以只用 elipses_marker =更换整个块...
(因为我知道我的终端支持UNI code),但究竟是什么这个 =〜
呢?
In this specific case I can just replace the entire block with elipses_marker="…"
(as I know my terminal supports unicode), but what exactly this =~
does?
推荐答案
这是一个唯一的庆典,除了内置的 [
命令,执行的正则表达式(模糊)匹配。
It's a bash-only addition to the built-in [[
command, performing regexp (fuzzy) matching.
在此情况下,如果 $ LC_CTYPE
的包含的字符串UTF。
In this case, if $LC_CTYPE
CONTAINS the string "UTF".
更多携带版:
if test `echo $LC_CTYPE | grep -c UTF` -ne 0 -a "$TERM" != "linux"
then
...
else
...
fi
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