03_03 bash feature details (bottom)

Command aliases

Alias comalias= ' COMMAND [options] [arguments] '

Aliases defined in the shell are valid only in the current shell life cycle: The valid range of aliases is only the current shell process:

Ualias Comalias Deleting aliases

Alias cp = ' Cp-i '

command to replace $ (commands) with the ' command '

To replace a subcommand in a command with the process of executing the result

echo "The current directory Is/etc"

echo "The current directory is $ (PWD)"

File-2013-12-12-12-13.txt

Date +%f-%h-$M-%s

Touch./file-$ (date +%f-%h-$M-%s). txt

BASH-supported quotes

": Command substitution

"", double quotes, weak references can implement variable substitution

', single quote strong reference can not implement variable substitution

File name wildcard globbing

* Any character of any length can be no longer

？ Match any single character

[] Specify any single character in any specified range

[ABC] [A-z] [A-za-z0-9]

[^]: matches any single character outside the specified range

[^0-9] Non-digital

[: Space:] white space characters

[[: Space:]] Blank Character Set

[:p UNCT:] Punctuation

[: Lower:] lowercase letters

[: Upper:] Uppercase

[: Alpha:] uppercase and lowercase letters

[:d Igit:] Number

[: Alnum:] numbers and uppercase and lowercase letters

also supports reverse [^[:space:]]

Can view man 7 glob

Touch A123 ABC abc123 XYZ x12 xyz123

Start with a letter A

LS A * =>a123 ABC abc123

Letter A begins with a 3-terminated character

LS a*3

Any number of files following the beginning of the letter

[A-za-z]*[0-9]

? y* ==>xyz xyz123

[[: Alpha:]]*[[:space:]]*[[:alpha:]]

The letter begins with a white-space character at the end of the letter

*[0-9]* *[[:d igit:]]*

Number end does not contain whitespace characters *[^[:space:]]*[0-9] There is a problem ... The regular can handle

Non-letter non-numeric: *[^[:alnum:]]*

This article is from the "Jiawu notes" blog, so be sure to keep this source http://jiawu.blog.51cto.com/9349234/1586768

03_03 bash feature details (bottom)