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Examples of common programs

Is there a some man-like program (or site/book) that can show me simple examples of common tools usage? So i can type in terminal show-example grep and it will output ... For matching multiple ...
9
votes
1answer
1k views

How can I get a help message for zsh builtin's?

If I want to get a brief usage message for a bash builtin, I can use help <builtin> at a command prompt, e.g. $ help export export: export [-fn] [name[=value] ...] or export -p Set export ...
35
votes
1answer
27k views

Understand `compgen` builtin command

From help compgen: $ help compgen compgen: compgen [-abcdefgjksuv] [-o option] [-A action] [-G globpat] [-W wordlist] [-F function] [-C command] [-X filterpat] [-P prefix] [-S suffix] [word] ...
5
votes
5answers
4k views

missing man pages of some commands

Typing man alias gives me No manual entry for alias The same thing goes for export and eval. At first I thought it only happens to shell built-in commands but man echo gives me the man page. ...