Some common but not memorable commands in linux

In linux, the set command, which is commonly used but not easy to remember, can be used to customize the shell environment and enable or disable the option using option o. For example, enable option: set-o option, and disable option: set + o. The shopt command is an alternative to the set command... in linux, the set command, which is commonly used but not easy to remember, can be used to customize the shell environment. the option "o" is used to enable or disable the option. For example, enable option: set-o option, and disable option: set + o. The shopt command is an alternative to the set command, which is similar to the set command in many aspects, but it adds many options. You can use the "-p" option to view the shopt option settings. "-U" indicates a reset option, and "-s" indicates that the option is currently set. $ * ---- All parameters of shellscript $1, $2... ---- shellscript or the first and second of the function... parameter $ # ---- number of parameters of the previous command or shellscript or function $ is basically the same as $ *, but is not affected by IFS $0 ---- shell script name