04.bash Foundation

◊ Basic framework:

A) wildcard characters *? [1-3] [123]

b) input/output redirection < << > >> 2>

c) Piping |

d) Background jobs jobs BG FG

e) Historical History!+ Historical Command number

f) Command Completion tab Press TAB to display all occurrences

1 , wildcard characters

* Match All ( multiple ) characters

？ Match a single character

2 , input and output redirection

> Output Redirection (Overwrite)

2> Error Output redirection

&> includes both functions (> and 2>)

>> Append output to File

< input redirection

<< here document (statistics two the same delimiter between the text information WC <<)

3 , Piping

Standard output of the previous command as standard input for the latter command

is a means of inter-process communication

The representation in the kernel is a memory buffer.

4 , background jobs

& Create a background job and return control directly to the shell

Jobs queries the current job

CTRL + Z Stop the foreground job

BG puts a stop-state job in the background

FG puts background work in front of the desk

5 , historical records

History Query Historical Table

!+ History command to execute a command in the history table

6 , aliases

Alias

Unalias

/etc/bashrc

.  The profile name is used to execute the corresponding configuration file (. . BASHRC)

04.bash Foundation