用哪个命令可知自己在运行什么SHELL？

KornLee

最初由 么心么肺 发表
这种只能说看到有哪些SHELL在运行，不能判定目前在运行哪个啊。

[/home/javalee/myshell]ps
  PID TTY          TIME CMD
  455 pts/0    00:00:00 ksh
  677 pts/0    00:00:00 bash
1039 pts/0    00:00:00 bash
1059 pts/0    00:00:00 tcsh
1079 pts/0    00:00:00 ksh
1080 pts/0    00:00:00 ps
难道从进程号的顺序看不出来嘛?!;)
最简单的还是lordbyorn兄的法子,echo $0 :thank

lordbyorn

难道从进程号的顺序看不出来嘛?!;)

The shell I write is base on this, of cause it only know the shell which it known.

Some times it wouldn't work. like:
tcsh &
csh &
ps

So echo $0 is the best and easist way.

么心么肺

最初由 lordbyorn 发表
The shell I write is base on this, of cause it only know the shell which it known.

Some times it wouldn't work. like:
tcsh &
csh &
ps

So echo $0 is the best and easist way.

正解！谢谢！
能说一下什么是echo $0吗？

lordbyorn

You can write a shell like this(use the name you like):
echo $0
and then run it. And you will find out.

Can you go though a shell book first before you ask question?

I hope you can ask more questions, but nobody like this boring question like "what does 'echo $0' mean?"

Glue

$0 是当前的命令行的第一个参数。
如果我在一个shell脚本文件里 echo $0，得到的是脚本文件的名字
那么怎么在脚本里得到脚本是用的什么shell呢？

别骂我

lucida

脚本里面第一行
#!/bin/bash或者perl,csh已经限制了脚本的运行环境，所以这种判断毫无必要
至少我个人这么认为

lordbyorn

I think so.

么心么肺

最初由 lordbyorn 发表
You can write a shell like this(use the name you like):
echo $0
and then run it. And you will find out.

Can you go though a shell book first before you ask question?

I hope you can ask more questions, but nobody like this boring question like "what does 'echo $0' mean?"

不好意思，怪我没想清楚就问，其实我之前学过知道0的意思的，只是一时钻进这个问题里，都忘了这么基本的东西了，到底是基本功不扎实，呵呵！

KornLee

对于熟练shell的sir来说,也许这个问题实在是...,不过对于初学者来说,确实是应该知道的!