pages/common/*: correct urls, see also improvements, unbashify pages, examples addition

[pranaovs]

• alias: fix link and add see also to unalias
• command: add -p flag which forces a search using default PATH
• dirs: add see also pushd and popd
• dirs: add explanation for -l and -v flag
• dirs: add dirs -n explanation to view nth entry from the last
• disown: fix see also section formatting according to style guide
• disown: add description for see also section of jobs page
• disown: mention bash-only commands appropriately
• disown: indicate how to find specific job number for disowning specific job
• echo: add see also to printf
• fg: add see also section to jobs, bg and disown
• fg: specify using jobs command to find job number
• bg: add jobs, fg and disown to see also
• bg: use term job number instead of job id
• local: add export command to see also
• printf: add echo to see also
• popd: see also section follow style guide
• pushd: see also section follow style guide
• test: add example of using test in a conditional if
• unalias: add see also alias
• wait: add ps to see also section
• wait: document how to find job number for calling jobs with %

Related to #10584

I just skimmed through the commands in the issue and modified some of them.

Please review and let me know if any changes are needed.

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):

[tldr-bot]

The build for this PR failed with the following error(s):

pages/common/alias.md:5: TLDR004 Command descriptions should end in a period
pages/common/bg.md:4: TLDR004 Command descriptions should end in a period
pages/common/dirs.md:20: TLDR005 Example descriptions should end in a colon with no trailing characters
pages/common/echo.md:4: TLDR004 Command descriptions should end in a period
pages/common/fg.md:4: TLDR004 Command descriptions should end in a period
pages/common/printf.md:4: TLDR004 Command descriptions should end in a period
pages/common/unalias.md:4: TLDR004 Command descriptions should end in a period

Please fix the error(s) and push again.

[pranaovs]

good bot

[pranaovs]

There are few pages which are for shell builtins. The flags in bash does not match with the ones in zsh (missing, different, etc). Please let me know how I can proceed with them. I haven't touched any of them yet.

[Managor]

Look good to me after these changes

[Managor]

There are few pages which are for shell builtins. The flags in bash does not match with the ones in zsh (missing, different, etc). Please let me know how I can proceed with them. I haven't touched any of them yet.

Do whatever you'd like and we'll hash them out. File a new PR for that. It's easier to process when they are separated into small bits.

[pranaovs]

Alright, ill look into them soon

[Managor]

Thanks