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查看当前命令行所用shell 查看linux中shell的几种方法

2011-03-01 15:40:07| 分类： CentOS | 标签： |举报 |字号大中小订阅

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ps | grep $$ | awk '{print $4}'

不带参数的ps命令显示和当前终端有关的进程状况
$$变量存储当前进程的PID
ps第四列是进程所使用的命令，如果是Shell，那么显示shell名，比如sh/ksh等
awk '{print $4}'就是只显示第四列的值

PS：用echo $SHELL可以查看系统默认的shell

查看当前发行版可以使用的shell
[jack@localhost ~]$ cat /etc/shells
/bin/sh
/bin/bash
/sbin/nologin
查看当前使用的shell
一、最常用的查看shell的命令，但不能实时反映当前shell
[jack@localhost ~]$ echo $SHELL
/bin/bash
二、下面这个用法并不是所有shell都支持
[jack@localhost ~]$ echo $0
bash
三、环境变量中shell的匹配查找
[jack@localhost ~]$ env | grep SHELL
SHELL=/bin/bash
四、口令文件中shell的匹配查找
[jack@localhost ~]$ cat /etc/passwd | grep jack
jack:x:500:500:mengfei:/home/jack:/bin/bash
五、查看当前进程
[jack@localhost ~]$ ps
PID TTY          TIME CMD
3052 pts/0    00:00:00 bash
3254 pts/0    00:00:00 ps
六、先查看当前shell的pid，再定位到此shell进程
[jack@localhost ~]$ echo $$
3052
[jack@localhost ~]$ ps -ef | grep 3052
jack        3052 3047 0 11:33 pts/0    00:00:00 bash
jack        3420 3052 0 11:57 pts/0    00:00:00 ps -ef
jack        3421 3052 0 11:57 pts/0    00:00:00 grep 3052
附：一条命令即可实现：
[jack@localhost ~]$ ps -ef | grep `echo $$` | grep -v grep | grep -v ps
jack        3052 3047 0 11:33 pts/0    00:00:00 bash

七、输入一条不存的命令，查看出错的shell提示
[jack@localhost ~]$ tom
bash: tom: command not found

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