Linux Basics 4

This chapter mainly wraps the contents: Historical command Review, and other commands

Catalog management: LS, CD, pwd, mkdir, rmdir, tree

File management: Touch, stat, file, RM, CP, MV, Namo

Date Time: date, clock, Hwclock, Cal

Text view commands: Cat, TAC, more, less, head, tail

Cat: Connect and display.

-N: Show line numbers

-e: Show end symbol (Linux end symbol is $)

-T: Show tabs

-V: Show nonprinting symbols

-A: Show all symbols

File 1 File 2: Link file 1 with the contents of file 2 for display

TAC: Turn the contents of the display back

CTRL + C: Force end.

Split-screen display commands: More, less

Space: Turn Back one screen

B: Flip One screen forward

Enter: Turn back one line

K: Turn the line forward.

MORE: Often want to turn back, the last page will be launched. Less: Often back page, the last one does not exit, only Q to quit.

Head: View top N rows, default is 10

Tail: View the following n rows.

-N: View the first few lines.

-f (Tail available): Displays the appended contents of the file immediately.

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[Email protected] ~]# head-3/etc/inittab
# Inittab is a used by upstart for the default runlevel.
#
# ADDING Other CONFIGURATION here would have NO EFFECT on YOUR SYSTEM.

Text processing: Cut, join, SED, awk

cut:-d: Set delimiter, default to Space

-F: Specifies the field to display. F1: Displays the first column. f1,3: Indicates that 1 columns and 3 columns are displayed. F1-3: Indicates that 1-3 columns are displayed.

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[Email protected] ~]# cut-d:-f1,3,5-7/etc/passwd
Root:0:root:/root:/bin/bash
Bin:1:bin:/bin:/sbin/nologin
Daemon:2:daemon:/sbin:/sbin/nologin

[Email protected] ~]# head-3/etc/passwd
Root:x:0:0:root:/root:/bin/bash
Bin:x:1:1:bin:/bin:/sbin/nologin
Daemon:x:2:2:daemon:/sbin:/sbin/nologin

Sort command: Sort

Sort: Does not affect the contents of the file, sorted by the first word in the document Fu Shen order.

-N: Sorts by numeric size.

-R: Reverse order.

-T: Field delimiter

-K: The first few lines. The field in which to sort.

-U: Do not display duplicate rows

-F: Sorting is case insensitive

Uniq: Show or ignore duplicate rows (duplicate and same behavior repeat line)

-D: Show only duplicate rows

-D: Show all duplicate rows (several lines are repeated several times)

-C: Displays the rows and describes the number of repetitions per line.

Text statistics: WC (Word count): line, number of characters, number of bytes (space also wrapped)

[Email protected] ~]# wc/etc/issue

3 75/etc/issue

-L: Show only rows

-W: number of words

-M: Number of characters

-L: Maximum number of characters for the longest line

Character processing commands: tr: convert or delete characters

TR Options ... set1 ...

Tr ' A-Z ' A-Z ' </etc/passwd

-D: Delete all the enactment characters that appear in the character set

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Linux Basics 4