linux中怎么查看shell内建命令的用法？

Question

在linux中有一些命令是shell的内建命令，比如 cd、umask、set、declare等，这些命令使用man帮助是没法查看的，那我该如何查看其使用方法呢？

Answer 1

These commands all have man files. Has your distribution cut these commands out? If the shell you are using is bash, yes.
If not, try help cmd, such as help cd, help set

Answer 2

npm install -g tldr

means too long don't read

Answer 3

man bash and type / to search

Answer 4

buildin, roughly this command, you can view all built-in commands.