Iv. shell input, output function and character color settings

One, shell input function

1. Keyboard input Way One:

[Email protected] four]#CatTest.SH#!/bin/Bash #-the e parameter resolves the escape character in the statementEcho-E"My name is user1\n my name is User2"#-n parameter allows the echo command to end without wrappingEcho-N"My name is user1\n my name is User2"Echo#输出一个空行 # An application exampleEcho-N"Please enter your name:"Read nameEcho$nameEcho "My name is $name"[email protected] four]#./test.SHMy name is user1my name was user2my name is user1\n My name is user2 Please enter your name: TomTom 

Way two:

Cat Demo. SH #!/bin/' Enter your name:'  nameecho  $name [[Email Protected] four]#. /demo. SH Enter your name: TomTom

second, shell output function

[Email protected] four]#CatOutput.SH#!/bin/BashEcho "Hello world!"Echo-E"Hello world\nvery good!"Echo-E"\033[32;47m [test]\033[0m"

[email protected] four]#./output.SHHelloWorld!Helloworldverygood![Test]

3. Subtitle Color Change(1), Example:  

Cat Out2. SH #!/bin/echo""sh out2. SH httpd Process [OK]

(2), color syntax:\033[foreground background color m \033[0m #0m代表恢复到系统默认的颜色 (3), character interface foreground color and background color:Foreground: 30 Black 31 Red 32 green 33 yellow 34 Blue 35 violet 36 Cyan 37 White
Background color: 40 Black 41 red 42 green 43 yellow 44 cyan 45 Blue 46 Cyan 47 White 4. Other Commands(1), CatUsage: cat [options] ...    [File] ...       Output the [file] or standard input combination to the standard output. -B,--number-nonblank to the non-null output line number-E,--show-ends displays "$"-N at the end of each line,--number all line numbers of the output- S,--squeeze-blank does not output multiple lines of empty line-T,--show-tabs will be shown as the ^i use: the production menu, as follows: Example:

[Email protected] four]#CatA.SH#!/bin/BashCat<<x #注意: Can be any value, not X, indicating the end from X to X, output as-is input your name: #heredoc字符串1) User12) User23) User3x[[email protected] four]#SHA.SHPlease input your name:1) User12) User23) User3

(2), TeeUsage: tee [options] ... [File] ... Copies the standard input to each specified file and displays it to standard output. (Output one copy and save one copy)-A,--append content appended to the given file instead of overwrite-I,--ignore-interrupts ignores interrupt signal Example: good for edge output side saving

sh A.shtee  menu.txtplease Input your name:1) user12 ) user23lsA. SH demo. sh menu.txt out2. sh output. sh test. SH

(3), MorePagination View (4), HeadUsage: head [options] ... [File] ... Each of the specified files is The first 10 lines showto standard output. -C, which displays the contents of the first K bytes of each file;-N, which displays the first K-line contents of each file; (5), TailUsage: tail [options] ... [File] ... Displays the maximum of each specified file after 10 linesto standard output.  -C, Output the last K-byte; In addition, use the-C +k output-F from the K-byte of each file, and instantly output the data appended to the file changes. -N, outputs the last few lines (6), NL 添加行号


[Email protected] four]#CatB.SH#!/bin/BashCat/etc/passwd|Head-2|NLNL/etc/passwd|Head-2[email protected] four]#SHB.SH1ROOT:X:0:0: root:/root:/bin/Bash2BIN:X:1:1: bin:/bin:/sbin/Nologin1ROOT:X:0:0: root:/root:/bin/Bash2BIN:X:1:1: Bin:/bin:/sbin/nologin

Four, shell input, output function, and character color settings