2016-1-30 Linux Basic Learning 4

Section:
Directory Management: Ls,cd,pwd,mkdir,tree
File Management: Touch,mkdir,rm,cp,mv,stat,nano
Date Time: Cal,date,clock,hwclock

View text : Cat,tac,more,less,head,tail

Command Terminator: Ctrl + C

Cat: Connect and display (header to tail)
-N: Numbering each line when displayed
-E: Displays the line terminator for each line (the line terminator for the Linux system text file is "$")
Tac:cat: Connect and display (tail to header)

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Split screen display: More,less
MORE: Turn backwards
Flip Screen:
Turn back one screen: space spaces (turn to the end and exit)
Turn One screen forward: b
Turn back one line: Enter
Turn One line forward: K
Less: (man is viewed with less)
Flip Screen:
Turn back one screen: space spaces
Turn One screen forward: b
Turn back one line: Enter
Turn One line forward: K
Find:
/keyword: from front to back
N: Next
N: Previous
? KEYWORD: from back to forward
N: Next
N: Previous
Exit: Q
Head
-mont: View Top N rows

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  -f: Monitoring a file
           View the end of a file without exiting, waiting for the new content appended to this file to appear         

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Text processing : Cut,jion,set,awk

Text file
Tom:12:male:2016/01/30

Field 1 2 3 4
Cut
-D: Specifies the field delimiter, which is the default space
-F: Specify the fields to display
Discrete notation:-F 1,3 Displays fields 1 and 3
Continuous notation:-F 1-3 Displays fields from 1 to 3

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Text sort:
Sort
-N: Numeric sorting
-R: Descending sort
-T: Specify field Delimiter
-K: Specifies which field to sort for the keyword
-U: The same row is displayed only once after sorting
-F: Ignore character capitalization when sorting

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Uniq: Adjacent and repeated display only once
-C: Shows the number of rows in a file that repeats
-D: Show only duplicate rows

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File Statistics: WC (Word count)
-L: The longest line contains several characters
-L: Show only the number of rows
-M: Displays only the number of characters
-W: Displays the number of words
-C: Show only the number of bytes

Character processing Commands: tr--convert or delete characters (processed one by one)
TR option Character Set 1[character Set 2]
Eg:tr ' AB ' AB '
-D: Delete all characters that appear in the character set (one character set is enough)

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2016-1-30 Linux Basic Learning 4