4 Linux Bash features

• command Aliases and command calls :

  • Alias alias= ' COMMAND ' when referencing with options need to quote only valid for current bash

  • Unalias alias Cancellation

  • \command: Use its own commands, not the commands defined in the alias

  • ": Strong references even if internal variables are considered strings or other

  • "": Weak references can be used in scripts $variable

  • ": Anti-quote, you can add additional commands in the script to return execution results

• wildcard :

  • *: Any character appears any number of times

  • []: matches any single character or character set in the specified character set

  • Span style= "FONT-SIZE:18PX;" >^: Take the inverse of the character set

  • [:lower:]:

  • [:upper:]:

  • [:alpha:]

  • [:d igit:]

  • [:alnum:]

  • [:p UNCT:]: punctuation

  • [:space:]: whitespace characters (including tab tab)

• Echo: Echo [OPTIONS] [STRING]

  • -n Do not output the trailing newline

  • -E can use escape characters

    • \ nthe line break

    • \ t tab

    • \b Spaces

This article is from the "Ops Dog" blog, make sure to keep this source http://yunweigou.blog.51cto.com/6299641/1626540

4 Linux Bash features