How can I know which shell I am using? - linux

Question

I am writing a shell script. The tutorial that I am reading have the first line like this :
#!/usr/bin/env bash/
but it isn't working for me. (error : no such directory)
How can I find out which bash I am using and where is it located?
Appreciate for any advice and help.
Thanks a lot. It works now.
solution is #!/usr/bin/env bash
Another problem: Why it just can't read the word 'restart'
my code in the start.sh:
#!/usr/bin/env bash/
RESTART="apachectl restart"
$RESTART
I does not work.
Usage: /usr/local/apache2/bin/httpd [-D name] [-d directory] [-f file]
[-C "directive"] [-c "directive"]
[-k start|restart|graceful|graceful-stop|sto p]
[-v] [-V] [-h] [-l] [-L] [-t] [-S]
Options:
-D name : define a name for use in <IfDefine name> directives
-d directory : specify an alternate initial ServerRoot
-f file : specify an alternate ServerConfigFile
-C "directive" : process directive before reading config files
-c "directive" : process directive after reading config files
-e level : show startup errors of level (see LogLevel)
-E file : log startup errors to file
-v : show version number
-V : show compile settings
-h : list available command line options (this page)
-l : list compiled in modules
-L : list available configuration directives
-t -D DUMP_VHOSTS : show parsed settings (currently only vhost settings)
-S : a synonym for -t -D DUMP_VHOSTS
-t -D DUMP_MODULES : show all loaded modules
-M : a synonym for -t -D DUMP_MODULES
-t : run syntax check for config files
why is it like that? it seems that it can read the word restart.
Thank you all! I have fixed it now.
solution: edit the file in unix (vim/nano and whatever but not in windows)
Thank again :)

Answer 1

Yet another way: echo $SHELL.

Answer 2

If you remove the / from bash/, it should work.

Answer 3

You ca try the following command
which bash
at a shell. Then put
#!<the output of which bash>

Answer 4

To find out where bash is, issue the command:
type bash
at your command prompt. and to make sure it is always found by your script use:
#!bash
this has the problem that some other bash may be found and used, which could be security issue, but I have been doing this for years.

Answer 5

Remove the extra character(s) you have at the end of lines. No slash is required and
dos2unix yourscript will remove the unwanted CRs.
#!/usr/bin/env bash

Answer 6

Actually better would be to open a new question for your restart problem.
Most probably you are not at the directory where the restart command is
defined or restart is not in your path. Try putting the whole path.