开发学院 WEB开发综合如何在.cshrc中判断是否在loginshell中？阅读

如何在.cshrc中判断是否在loginshell中？

　2006-03-05 11:33:39　来源：WEB开发网　　　

核心提示：当有人这么问的时候，通常要问的是要如何判断是否是一个interactiveshell?或是问要如何判断是否是最上层的shell?若你是要问"是否在loginshell中"（注：就是在做完.cshrc后，如何在.cshrc中判断是否在loginshell中？，会再去做.login），那么你也许用&qu

当有人这么问的时候，通常要问的是要如何判断是否是一个　interactive　shell?　或是问要如何判断是否是最上层的　shell　?　

若你是要问　"是否在　login　shell　中"（注：就是在做完　.cshrc　后，会再去做　.login），那么你也许用　"ps"　和　"$$"　随便弄一弄，就能知道了。因为通常　login　shells　的名字在　"ps"　看起来都是由　'-'　做开头的。如果你是真的对另外两个问题感兴趣，那么这里有个方法可以让你在.cshrc　中判断。

if (! $?CSHLEVEL) then 
# 
# This is a "top-level" shell, 
# perhaps a login shell, perhaps a shell started up by 
# 'rsh machine some-command' 
# This is where we should set PATH and anything else we 
# want to apply to every one of our shells. 
# 
    setenv CSHLEVEL 0 
    set home = ~username		# just to be sure 
    source ~/.env			# environment stuff we always want 
else 
# 
# This shell is a child of one of our other shells so 
# we don't need to set all the environment variables again. 
# 
    set tmp = $CSHLEVEL 
    @ tmp  
    setenv CSHLEVEL$tmp 
endif 

# Exit from .cshrc if not interactive, e.g. under rsh 
if (! $?PRompt) exit 

# Here we could set the prompt or aliases that would be useful 
# for interactive shells only. 

source ~/.aliases