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I was reading about the differences between /bin/sh and /bin/bash and came across this interesting question/answer: here
I made a comment to the answer asking this same question in my title to which he replied with an updated answer:
How can you find out what /bin/sh points to on your system?
The complication is that /bin/sh could be a symbolic link or a hard link. If it's a symbolic link, a portable way to resolve it is:
> % file -h /bin/sh
> /bin/sh: symbolic link to bash
If it's a hard link, try
> % find -L /bin -samefile /bin/sh
> /bin/sh
> /bin/bash
I tried this and had trouble so I thought I would make a separate question.
My results from the linked answer:
>file -h /bin/sh
>/bin/sh: executable (RISC System/6000) or object module
>find -L /bin -samefile /bin/sh
>find: bad option -samefile
What am I missing? I'm running AIX:
>oslevel -s
7100-03-03-1415
525
#!/bin/sh: It is used to execute the file using sh, which is a Bourne shell, or a compatible shell. #!/bin/csh: It is used to execute the file using csh, the C shell, or a compatible shell.
Adding #!/bin/bash as the first line of your script, tells the OS to invoke the specified shell to execute the commands that follow in the script. #! is often referred to as a “hash-bang”, “she-bang” or “sha-bang”. Though it is only executed if you run your script as an executable.
Answer: The chsh command changes the login shell of your username. When altering a login shell, the chsh command displays the current login shell and then prompts for the new one. Here are the most common shells, which are listed in /etc/shells: /bin/sh.
If you need to programatically test if they are the same, you can use stat to query the inode of /bin/sh and compare with the inode of /bin/bash.
if [ $(stat -L -c %i /bin/sh) -eq $(stat -L -c %i /bin/bash) ]; then
.....
fi
If you just need to see with your eyes if they are the same run the stat commands and see if they return the same inode number.
stat -L -c %i /bin/sh
stat -L -c %i /bin/bash
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