What command to type in the console to find out what type it is (for example, Bash)?

Question

linux

What command to type in the console to find out what type it is (for example, Bash)?

Answer 1

echo $SHELL

Answer 2

the command is called file

[email protected]:~# file /etc/init.d/hwclock.sh
/etc/init.d/hwclock.sh: POSIX shell script, ASCII text executable
[email protected]:~# file /sbin/hwclock
/sbin/hwclock: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=d536e4f186b5ed702a39ac54f08a2f85ff5c9308, stripped

Answer 3

man command name or
command --help
a, reverse task, forgot command, but something about type
apropos keyword
apropos type
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