Linux 124 Course 4, create, view, edit files

Redirecting output to a file or Grogram

      重定向

> Chasing heavier orientation
|&>> redirect both standard output and error output to a file
| Pipe character (the output of the previous command as input to the next command)
Tee is usually used in conjunction with pipe character, as the next command input colleague, do standard output

Whatis Cal

Cal-1 cal-3 cal-y

Cal > Cal.txt redirect standard output to Cal.txt
Cat Cal.txt

The call >cal.txt outputs the error output to the display
Call 2>cal.txt error output, redirect to Cat.txt
Each time a redirected output is made, the original content is overwritten

Cal >>cal.txt
Cal >>cal.txt
Cal >>cal.txt

Date >>test.file
Cal 1&2>>cal.txt

Call 2>/dev/null Discard the wrong information

cat/etc/passwd
cat/etc/passwd | grep root from the result of the previous command output, as input to the next command
grep root/etc/passwd

Ls-l |tee test.txt Output The command from the screen while importing into the file

Ls-l | tee/dev/pts/0 |mail-s XXX

2. Editor
   Vim
   Gedit Editor

(1) Gedit test.txt editing tools for graphical editing tools

(2) Vim non-graphical editing tools
Vim has four basic modes:
Command mode.
Edit mode command line mode input I/O/A press ESC to return to command line mode
Extend Command mode Input ":" Press ESC to return to command line mode.
Visual edit mode Visual editing modes Press V/v/ctrl+v to enter

command-line Mode commands
G quickly position the cursor to the last line
GG position the cursor to the first row
5G position the cursor to line fifth
o Insert row on the next line of the cursor
O insert a row on the previous line of the cursor
DD deletes the cursor in the row
5DD Delete the five lines where the cursor is located
d^ Delete the bank's contents before the cursor
d$ Delete the contents after the cursor
D Delete the contents after the cursor
U undo
U withdraw the contents of the bank
YY copy
5yy Copy Five Elements
P Paste before cursor
P paste on top of the line where the cursor is located
H the top line of this page
M in the middle of this page
L the bottom line of this page
/student down find keyword n toggle keyword n up toggle keyword
Student Search up keyword n toggle keyword n Toggle keyword up

Command for the last-line mode:
: Nohl Suppress highlighting
: Set Nu Sets line number
: Set Nonu Cancel line number
: W Save
: Q exit
: Wq Save and exit
: wq! Force Save and exit
: W/tmp/aa Save As
: e/root/passwd Discard current file edit, open new file
：！ + command to execute commands without interrupting the current edits
:! Date

: R + File path reads other file contents at cursor location and inserts
: r/root/cal

: S/student/chen The first student replacement of the line where the cursor is positioned is called Chen
S/student/chen/g: The student substitution of the line where the cursor is positioned is called Chen
:%s/student/chen/g The student replacement of the full text called Chen
:%S/STUDENT/CHEN/GC The student replacement of the full text, called Chen, for interactive substitution
: 40,50 s/student/chen/g to replace 40-50 of student with the name Chen

: SP Split window can be toggled by Ctrl+w window
: VSP Vertical Split window
CTRL +W Switch between windows
Close window

Visual editing mode:

V Select text by character Delete delete
V Select text on a per-end basis
CTRL + V selects text as a chunk
　　
　　

Linux 124 Course 4, create, view, edit files